diff --git a/src/mame/drivers/playch10.cpp b/src/mame/drivers/playch10.cpp
index 0c2d0920070..b9f23c08261 100644
--- a/src/mame/drivers/playch10.cpp
+++ b/src/mame/drivers/playch10.cpp
@@ -377,7 +377,14 @@ void playch10_state::cart_map(address_map &map)
 	map(0x4014, 0x4014).w(FUNC(playch10_state::sprite_dma_w));
 	map(0x4016, 0x4016).rw(FUNC(playch10_state::pc10_in0_r), FUNC(playch10_state::pc10_in0_w));
 	map(0x4017, 0x4017).r(FUNC(playch10_state::pc10_in1_r));  /* IN1 - input port 2 / PSG second control register */
-	map(0x8000, 0xffff).rom();
+	// Games that don't bank PRG
+	map(0x8000, 0xffff).rom().region("prg", 0);
+	// Games that bank PRG
+	map(0x8000, 0xffff).view(m_prg_view);
+	m_prg_view[0](0x8000, 0x9fff).bankr(m_prg_banks[0]);
+	m_prg_view[0](0xa000, 0xbfff).bankr(m_prg_banks[1]);
+	m_prg_view[0](0xc000, 0xdfff).bankr(m_prg_banks[2]);
+	m_prg_view[0](0xe000, 0xffff).bankr(m_prg_banks[3]);
 }
 
 void playch10_state::cart_a_map(address_map &map)
@@ -424,8 +431,8 @@ void playch10_state::cart_e_map(address_map &map)
 {
 	cart_map(map);
 
-	/* nvram at $6000-$6fff */
-	map(0x6000, 0x6fff).ram();
+	/* nvram at $6000-$7fff */
+	map(0x6000, 0x7fff).ram().share("nvram");
 
 	/* basically a mapper 9 on a nes */
 	map(0x8000, 0xffff).w(FUNC(playch10_state::eboard_rom_switch_w));
@@ -443,8 +450,8 @@ void playch10_state::cart_f2_map(address_map &map)
 {
 	cart_f_map(map);
 
-	/* extra ram at $6000-$6fff */
-	map(0x6000, 0x6fff).ram();
+	/* extra ram at $6000-$7fff */
+	map(0x6000, 0x7fff).ram();
 }
 
 void playch10_state::cart_g_map(address_map &map)
@@ -462,9 +469,6 @@ void playch10_state::cart_h_map(address_map &map)
 {
 	cart_map(map);
 
-	/* extra ram at $6000-$7fff */
-	map(0x6000, 0x7fff).ram();
-
 	/* Roms are banked at $8000 to $ffff */
 	map(0x8000, 0xffff).w(FUNC(playch10_state::hboard_rom_switch_w));
 }
@@ -940,8 +944,8 @@ ROM_START( pc_smb )     /* Super Mario Bros. */
 	ROM_LOAD( "u3sm",    0x0c000, 0x2000, CRC(4b5f717d) SHA1(c39c90f9503c4692af4a8fdb3e18ef7cf04e897f) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "u1sm",    0x08000, 0x8000, CRC(5cf548d3) SHA1(fefa1097449a3a11ebf8c6199e905996c5dc8fbd) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "u1sm",    0x0000, 0x8000, CRC(5cf548d3) SHA1(fefa1097449a3a11ebf8c6199e905996c5dc8fbd) )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u2sm",    0x00000, 0x2000, CRC(867b51ad) SHA1(394badaf0b0bdd0ea279a1bca89a9d9ddc00b1b5) )
@@ -955,8 +959,9 @@ ROM_START( pc_ebike )   /* Excitebike */
 	ROM_LOAD( "u3eb",    0x0c000, 0x2000, CRC(8ff0e787) SHA1(35a6d7186dee4fd4ba015ec0db5181768411aa3c) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "u1eb",    0x0c000, 0x4000, CRC(3a94fa0b) SHA1(6239e91ccefdc017d233cbae388c6568a17ed04b) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "u1eb",    0x0000, 0x4000, CRC(3a94fa0b) SHA1(6239e91ccefdc017d233cbae388c6568a17ed04b) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u2eb",    0x00000, 0x2000, CRC(e5f72401) SHA1(a8bf028e1a62677e48e88cf421bb2a8051eb800c) )
@@ -970,8 +975,8 @@ ROM_START( pc_1942 )    /* 1942 */
 	ROM_LOAD( "u3",      0x0c000, 0x2000, CRC(415b8807) SHA1(9d6161bbc6dec5873cc6d8a570141d4af42fa232) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "u1",      0x08000, 0x8000, CRC(c4e8c04a) SHA1(d608f769333b13da9c67f07599e405944893a950) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "u1",      0x0000, 0x8000, CRC(c4e8c04a) SHA1(d608f769333b13da9c67f07599e405944893a950) )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u2",      0x00000, 0x2000, CRC(03379b76) SHA1(d2a6ca1cdd8935525f59f1d38806b2296cb12a12) )
@@ -985,8 +990,9 @@ ROM_START( pc_bfght )   /* Balloon Fight */
 	ROM_LOAD( "bf-u3",   0x0c000, 0x2000, CRC(a9949544) SHA1(0bb9fab67769a4eaa1b903a3217dbb5ca6feddb8) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "bf-u1",   0x0c000, 0x4000, CRC(575ed2fe) SHA1(63527ea590aa79a6b09896c35021de785fd40851) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "bf-u1",   0x0000, 0x4000, CRC(575ed2fe) SHA1(63527ea590aa79a6b09896c35021de785fd40851) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "bf-u2",   0x00000, 0x2000, CRC(c642a1df) SHA1(e73cd3d4c0bad8e6f7a1aa6a580f3817a83756a9) )
@@ -1000,8 +1006,9 @@ ROM_START( pc_bball )   /* Baseball */
 	ROM_LOAD( "ba-u3",   0x0c000, 0x2000, CRC(06861a0d) SHA1(b7263280a39f544ca4ab1b4d3e8c5fe17ea95e57) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "ba-u1",   0x0c000, 0x4000, CRC(39d1fa03) SHA1(28d84cfefa81bbfd3d26e0f70f1b9f53383e54ad) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "ba-u1",   0x0000, 0x4000, CRC(39d1fa03) SHA1(28d84cfefa81bbfd3d26e0f70f1b9f53383e54ad) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "ba-u2",   0x00000, 0x2000, CRC(cde71b82) SHA1(296ccef8a1fd9209f414ce0c788ab0dc95058242) )
@@ -1015,8 +1022,9 @@ ROM_START( pc_golf )    /* Golf */
 	ROM_LOAD( "gf-u3",   0x0c000, 0x2000, CRC(882dea87) SHA1(e3bbca36efa66231b933713dec032bbb926b36e5) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "gf-u1",   0x0c000, 0x4000, CRC(f9622bfa) SHA1(b4e341a91f614bb19c67cc0205b2443591567aea) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "gf-u1",   0x0000, 0x4000, CRC(f9622bfa) SHA1(b4e341a91f614bb19c67cc0205b2443591567aea) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "gf-u2",   0x00000, 0x2000, CRC(ff6fc790) SHA1(40177839b61f375f2ad03b203328683264845b5b) )
@@ -1030,8 +1038,8 @@ ROM_START( pc_kngfu )   /* Kung Fu */
 	ROM_LOAD( "sx-u3",   0x0c000, 0x2000, CRC(ead71b7e) SHA1(e255c08f92d6188dad6b27446b0117cd7cee4364) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "sx-u1",   0x08000, 0x8000, CRC(0516375e) SHA1(55dc3550c6133f8624eb6cf3d2f145e4313c2ff6) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "sx-u1",   0x0000, 0x8000, CRC(0516375e) SHA1(55dc3550c6133f8624eb6cf3d2f145e4313c2ff6) )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "sx-u2",   0x00000, 0x2000, CRC(430b49a4) SHA1(7e618dbff521c3d5ee0f3d8bb01d2e770395a6bc) )
@@ -1045,8 +1053,9 @@ ROM_START( pc_tenis )   /* Tennis */
 	ROM_LOAD( "te-u3",   0x0c000, 0x2000, CRC(6928e920) SHA1(0bdc64a6f37d8cf5e8efacc5004a6ae43a28cd60) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "te-u1",   0x0c000, 0x4000, CRC(8b2e3e81) SHA1(e54274c0b0d651458c5459d41872b1f99904d0fb) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "te-u1",   0x0000, 0x4000, CRC(8b2e3e81) SHA1(e54274c0b0d651458c5459d41872b1f99904d0fb) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "te-u2",   0x00000, 0x2000, CRC(3a34c45b) SHA1(2cc26a01c38ead50503dccb3ee929ba7a2b6772c) )
@@ -1060,8 +1069,8 @@ ROM_START( pc_vball )   /* Volley Ball */
 	ROM_LOAD( "vb-u3",   0x0c000, 0x2000, CRC(9104354e) SHA1(84374b1df747800f7e70b5fb6a16fd3607b724c9) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "vb-u1",   0x08000, 0x8000, CRC(35226b99) SHA1(548787ba5ca00290da4efc9af40054dc1889014c) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "vb-u1",   0x0000, 0x8000, CRC(35226b99) SHA1(548787ba5ca00290da4efc9af40054dc1889014c) )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "vb-u2",   0x00000, 0x2000, CRC(2415dce2) SHA1(fd89b4a542989a89c2d0467257dca57518bfa96b) )
@@ -1075,8 +1084,9 @@ ROM_START( pc_mario )   /* Mario Bros. */
 	ROM_LOAD( "ma-u3",   0x0c000, 0x2000, CRC(a426c5c0) SHA1(0cf31de3eb18f17830dd9aa3a33fe4a6947f6ceb) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "ma-u1",   0x0c000, 0x4000, CRC(75f6a9f3) SHA1(b6f88f7a2f9a49cc9182a244571730198f1edc4b) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "ma-u1",   0x0000, 0x4000, CRC(75f6a9f3) SHA1(b6f88f7a2f9a49cc9182a244571730198f1edc4b) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x02000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "ma-u2",   0x00000, 0x2000, CRC(10f77435) SHA1(a646c3443832ada84d31a3a8a4b34aebc17cecd5) )
@@ -1091,8 +1101,9 @@ ROM_START( pc_duckh )   /* Duck Hunt */
 	ROM_LOAD( "u3",      0x0c000, 0x2000, CRC(2f9ec5c6) SHA1(1e1b835339b030605841a032f066ccb5ca1fef20) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "u1",      0x0c000, 0x4000, CRC(90ca616d) SHA1(b742576317cd6a04caac25252d5593844c9a0bb6) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "u1",      0x0000, 0x4000, CRC(90ca616d) SHA1(b742576317cd6a04caac25252d5593844c9a0bb6) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x04000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u2",      0x00000, 0x2000, CRC(4e049e03) SHA1(ffad32a3bab2fb3826bc554b1b9838e837513576) )
@@ -1106,8 +1117,9 @@ ROM_START( pc_hgaly )   /* Hogan's Alley */
 	ROM_LOAD( "ha-u3",   0x0c000, 0x2000, CRC(a2525180) SHA1(9c981c1679c59c7b7c069f7d1cb86cb8aa280f22) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "ha-u1",   0x0c000, 0x4000, CRC(8963ae6e) SHA1(bca489ed0fb58e1e99f36c427bc0d7d805b6c61a) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "ha-u1",   0x0000, 0x4000, CRC(8963ae6e) SHA1(bca489ed0fb58e1e99f36c427bc0d7d805b6c61a) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x04000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "ha-u2",   0x00000, 0x2000, CRC(5df42fc4) SHA1(4fcf23151d9f11c1ef1b1007dd8058f5d5fe9ab8) )
@@ -1121,8 +1133,9 @@ ROM_START( pc_wgnmn )   /* Wild Gunman */
 	ROM_LOAD( "wg-u3",   0x0c000, 0x2000, CRC(da08afe5) SHA1(0f505ccee372a37971bad7bbbb7341336ee70f97) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "wg-u1",   0x0c000, 0x4000, CRC(389960db) SHA1(6b38f2c86ef27f653a2bdb9c682ac0bc981c7db6) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "wg-u1",   0x0000, 0x4000, CRC(389960db) SHA1(6b38f2c86ef27f653a2bdb9c682ac0bc981c7db6) )
+	ROM_RELOAD(          0x4000, 0x4000 )
 
 	ROM_REGION( 0x04000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "wg-u2",   0x00000, 0x2000, CRC(a5e04856) SHA1(9194d89a34f687742216889cbb3e717a9ae81c92) )
@@ -1137,8 +1150,8 @@ ROM_START( pc_tkfld )   /* Track & Field */
 	ROM_LOAD( "u4tr",    0x0c000, 0x2000, CRC(70184fd7) SHA1(bc6f6f942948ddf5a7130d9688f12ef5511a7a30) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "u2tr",    0x08000, 0x8000, CRC(d7961e01) SHA1(064cb6e3e5525682a1805b01ba64f2fd75462496) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "u2tr",    0x0000, 0x8000, CRC(d7961e01) SHA1(064cb6e3e5525682a1805b01ba64f2fd75462496) )
 
 	ROM_REGION( 0x08000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u3tr",    0x00000, 0x8000, CRC(03bfbc4b) SHA1(ffc4e0e1d858fb4472423ae1c1fdc1e8197c30f0) )
@@ -1152,8 +1165,8 @@ ROM_START( pc_grdus )   /* Gradius */
 	ROM_LOAD( "gr-u4",   0x0c000, 0x2000, CRC(27d76160) SHA1(605d58c57969c831778b95356fcf103a1d5f98a3) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "gr-u2",   0x08000, 0x8000, CRC(aa96889c) SHA1(e4380a7c0778541af8216e3ac1e14ff23fb074a9) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "gr-u2",   0x0000, 0x8000, CRC(aa96889c) SHA1(e4380a7c0778541af8216e3ac1e14ff23fb074a9) )
 
 	ROM_REGION( 0x08000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "gr-u3",   0x00000, 0x8000, CRC(de963bec) SHA1(ecb76b5897658ebac31a07516bb2a5820279474f) )
@@ -1167,8 +1180,8 @@ ROM_START( pc_grdue )   /* Gradius (Early version) */
 	ROM_LOAD( "gr-u4",   0x0c000, 0x2000, CRC(27d76160) SHA1(605d58c57969c831778b95356fcf103a1d5f98a3) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "gr-u1e",  0x08000, 0x8000, CRC(9204a65d) SHA1(500693f8f65b1e2f09b722c5fa28b32088e22a29) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "gr-u1e",  0x0000, 0x8000, CRC(9204a65d) SHA1(500693f8f65b1e2f09b722c5fa28b32088e22a29) )
 
 	ROM_REGION( 0x08000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "gr-u3",   0x00000, 0x8000, CRC(de963bec) SHA1(ecb76b5897658ebac31a07516bb2a5820279474f) )
@@ -1184,9 +1197,9 @@ ROM_START( pc_rnatk )   /* Rush N' Attack */
 	ROM_LOAD( "ra-u4",   0x0c000, 0x2000, CRC(ebab7f8c) SHA1(ae46e46d878cdbc28cd42b40dae1fd1a6c1b31ed) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "ra-u1",   0x10000, 0x10000, CRC(5660b3a6) SHA1(4e7ad9be59990e4a560d87a1bac9b708074e9db1) ) /* banked */
-	ROM_LOAD( "ra-u2",   0x20000, 0x10000, CRC(2a1bca39) SHA1(ca1eebf85bea85ce7bcdf38933ae495856e17ae1) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "ra-u1",   0x00000, 0x10000, CRC(5660b3a6) SHA1(4e7ad9be59990e4a560d87a1bac9b708074e9db1) ) /* banked */
+	ROM_LOAD( "ra-u2",   0x10000, 0x10000, CRC(2a1bca39) SHA1(ca1eebf85bea85ce7bcdf38933ae495856e17ae1) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1199,9 +1212,9 @@ ROM_START( pc_cntra )   /* Contra */
 	ROM_LOAD( "u4ct",    0x0c000, 0x2000, CRC(431486cf) SHA1(8b8a2bcddb1dfa027c249b62659dcc7bb8ec2778) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "u1ct",    0x10000, 0x10000, CRC(9fcc91d4) SHA1(ad1742a0da87cf7f26f81a99f185f0c28b9e7e6e) ) /* banked */
-	ROM_LOAD( "u2ct",    0x20000, 0x10000, CRC(612ad51d) SHA1(4428e136b55778299bb269520b459c7112c0d6b2) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u1ct",    0x00000, 0x10000, CRC(9fcc91d4) SHA1(ad1742a0da87cf7f26f81a99f185f0c28b9e7e6e) ) /* banked */
+	ROM_LOAD( "u2ct",    0x10000, 0x10000, CRC(612ad51d) SHA1(4428e136b55778299bb269520b459c7112c0d6b2) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1214,10 +1227,10 @@ ROM_START( pc_pwrst )   /* Pro Wrestling */
 	ROM_LOAD( "pw-u4",   0x0c000, 0x2000, CRC(0f03d71b) SHA1(82b94c2e4568d6de4d8cff49f3e416005a2e22ec) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "pw-u1",   0x10000, 0x08000, CRC(6242c2ce) SHA1(ea7d1cf9dece021c9a40772af7c6dcaf58b10585) ) /* banked */
-	ROM_RELOAD(          0x18000, 0x08000 )
-	ROM_LOAD( "pw-u2",   0x20000, 0x10000, CRC(ef6aa17c) SHA1(52171699eaee0b811952c5706584cff4e7cfb39a) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "pw-u1",   0x00000, 0x08000, CRC(6242c2ce) SHA1(ea7d1cf9dece021c9a40772af7c6dcaf58b10585) ) /* banked */
+	ROM_RELOAD(          0x08000, 0x08000 )
+	ROM_LOAD( "pw-u2",   0x10000, 0x10000, CRC(ef6aa17c) SHA1(52171699eaee0b811952c5706584cff4e7cfb39a) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1230,9 +1243,9 @@ ROM_START( pc_cvnia )   /* Castlevania */
 	ROM_LOAD( "u4cv",    0x0c000, 0x2000, CRC(a2d4245d) SHA1(3703171d526e6de99e475afe0d942d69b89950a9) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "u1cv",    0x10000, 0x10000, CRC(add4fc52) SHA1(bbb4638a8e7660911896393d61580610a6535c62) ) /* banked */
-	ROM_LOAD( "u2cv",    0x20000, 0x10000, CRC(7885e567) SHA1(de1e5a5b4bbd0116c91564edc3d552239074e8ae) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u1cv",    0x00000, 0x10000, CRC(add4fc52) SHA1(bbb4638a8e7660911896393d61580610a6535c62) ) /* banked */
+	ROM_LOAD( "u2cv",    0x10000, 0x10000, CRC(7885e567) SHA1(de1e5a5b4bbd0116c91564edc3d552239074e8ae) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1245,9 +1258,9 @@ ROM_START( pc_dbldr )   /* Double Dribble */
 	ROM_LOAD( "dw-u4",    0x0c000, 0x2000, CRC(5006eef8) SHA1(6051d4750d95cdc0a71ecec40b5be4477921ca54) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "dw-u1",    0x10000, 0x10000, CRC(78e08e61) SHA1(a278e012ac89b8ae56d4a186c99f5ea2591f87b5) ) /* banked */
-	ROM_LOAD( "dw-u2",    0x20000, 0x10000, CRC(ab554cde) SHA1(86f5788f856dd9336eaaadf8d5295435b0421486) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "dw-u1",    0x00000, 0x10000, CRC(78e08e61) SHA1(a278e012ac89b8ae56d4a186c99f5ea2591f87b5) ) /* banked */
+	ROM_LOAD( "dw-u2",    0x10000, 0x10000, CRC(ab554cde) SHA1(86f5788f856dd9336eaaadf8d5295435b0421486) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1260,9 +1273,9 @@ ROM_START( pc_rygar )   /* Rygar */
 	ROM_LOAD( "ry-u4",    0x0c000, 0x2000, CRC(7149071b) SHA1(fbc7157eb16eedfc8808ab6224406037e41c44ef) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "ry-u1",    0x10000, 0x10000, CRC(aa2e54bc) SHA1(b44cd385d4019a535a4924a093ee9b097b850db4) ) /* banked */
-	ROM_LOAD( "ry-u2",    0x20000, 0x10000, CRC(80cb158b) SHA1(012f378e0b5a5bbd32ad837cdfa096df6843d274) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "ry-u1",    0x00000, 0x10000, CRC(aa2e54bc) SHA1(b44cd385d4019a535a4924a093ee9b097b850db4) ) /* banked */
+	ROM_LOAD( "ry-u2",    0x10000, 0x10000, CRC(80cb158b) SHA1(012f378e0b5a5bbd32ad837cdfa096df6843d274) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1275,9 +1288,9 @@ ROM_START( pc_trjan )   /* Trojan */
 	ROM_LOAD( "tj-u4",    0x0c000, 0x2000, CRC(10835e1d) SHA1(ae0f3ec8d52707088af79d00bca0871af105da36) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "tj-u1",    0x10000, 0x10000, CRC(335c0e62) SHA1(62164235dc8e2a4419cb38f4cacf7ba2f3eb536b) ) /* banked */
-	ROM_LOAD( "tj-u2",    0x20000, 0x10000, CRC(c0ddc79e) SHA1(5c23bb54eda6a55357e97d7322db453170e27598) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "tj-u1",    0x00000, 0x10000, CRC(335c0e62) SHA1(62164235dc8e2a4419cb38f4cacf7ba2f3eb536b) ) /* banked */
+	ROM_LOAD( "tj-u2",    0x10000, 0x10000, CRC(c0ddc79e) SHA1(5c23bb54eda6a55357e97d7322db453170e27598) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1291,8 +1304,8 @@ ROM_START( pc_goons )   /* The Goonies */
 	ROM_LOAD( "gn-u3",   0x0c000, 0x2000, CRC(33adedd2) SHA1(c85151819e2550e60cbe8f7d247a8da88cb805a4) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x10000, "cart", 0 )
-	ROM_LOAD( "gn-u1",   0x08000, 0x8000, CRC(efeb0c34) SHA1(8e0374858dce0a10ffcfc5109f8287ebdea388e8) )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "gn-u1",   0x0000, 0x8000, CRC(efeb0c34) SHA1(8e0374858dce0a10ffcfc5109f8287ebdea388e8) )
 
 	ROM_REGION( 0x04000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "gn-u2",   0x00000, 0x4000, CRC(0f9c7f49) SHA1(f2fcf55d22a38a01df45393c90c73ff14b3b647c) )
@@ -1307,9 +1320,9 @@ ROM_START( pc_radrc )   /* Rad Racer */
 	ROM_LOAD( "rc-u5",   0x0c000, 0x2000, CRC(ae60fd08) SHA1(fa7c201499cd702d8eef545bb05b0df833d2b406) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "rc-u1",   0x10000, 0x10000, CRC(dce369a7) SHA1(d7f293956d605af7cb6b81dbb80eaa4ad482ac0e) )
-	ROM_LOAD( "rc-u2",   0x20000, 0x10000, CRC(389a79b5) SHA1(58de166d757e58c515272efc9d0bc03d1eb1086d) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "rc-u1",   0x00000, 0x10000, CRC(dce369a7) SHA1(d7f293956d605af7cb6b81dbb80eaa4ad482ac0e) )
+	ROM_LOAD( "rc-u2",   0x10000, 0x10000, CRC(389a79b5) SHA1(58de166d757e58c515272efc9d0bc03d1eb1086d) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1322,9 +1335,9 @@ ROM_START( pc_mtoid )   /* Metroid */
 	ROM_LOAD( "mt-u5",   0x0c000, 0x2000, CRC(3dc25049) SHA1(bf0f72db9e6904f065801e490014405a734eb04e) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "mt-u1",   0x10000, 0x10000, CRC(4006ff10) SHA1(9563a6b4ff91c78ab9cbf97ea47a3f62524844d2) )
-	ROM_LOAD( "mt-u2",   0x20000, 0x10000, CRC(ace6bbd8) SHA1(ac9c22bcc33aeee18b4f42a5a628bc5e147b4c29) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "mt-u1",   0x00000, 0x10000, CRC(4006ff10) SHA1(9563a6b4ff91c78ab9cbf97ea47a3f62524844d2) )
+	ROM_LOAD( "mt-u2",   0x10000, 0x10000, CRC(ace6bbd8) SHA1(ac9c22bcc33aeee18b4f42a5a628bc5e147b4c29) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1338,8 +1351,8 @@ ROM_START( pc_miket )   /* Mike Tyson's Punchout */
 	ROM_LOAD( "u5pt",    0x0c000, 0x2000, CRC(b434e567) SHA1(8e23c580b5556aacbeeb36fe36e778137c780903) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "u1pt",    0x10000, 0x20000, CRC(dfd9a2ee) SHA1(484a6793949b8cbbc65e3bcc9188bc63bb17b575) ) /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u1pt",    0x00000, 0x20000, CRC(dfd9a2ee) SHA1(484a6793949b8cbbc65e3bcc9188bc63bb17b575) ) /* banked */
 
 	ROM_REGION( 0x20000, "gfx2", 0 )    /* cart gfx */
 	ROM_LOAD( "u3pt",    0x00000, 0x20000, CRC(570b48ea) SHA1(33de517b16b61625909d2eb5307c08b337b542c4) )
@@ -1354,8 +1367,8 @@ ROM_START( pc_ngaid )   /* Ninja Gaiden */
 	ROM_LOAD( "u2ng",    0x0c000, 0x2000, CRC(7505de96) SHA1(a9cbe6d4d2d33aeecb3e041315fbb266c886ebf1) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "u4ng",    0x10000, 0x20000, CRC(5f1e7b19) SHA1(ead83487d9be2f1d16c1d0b438a361a06508cd85) )   /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u4ng",    0x00000, 0x20000, CRC(5f1e7b19) SHA1(ead83487d9be2f1d16c1d0b438a361a06508cd85) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "u1ng",   0x00000, 0x20000, CRC(eccd2dcb) SHA1(2a319086f7c22b8fe7ca8ab72436a7c8d07b915e) )    /* banked */
@@ -1369,8 +1382,8 @@ ROM_START( pc_ddrgn )   /* Double Dragon */
 	ROM_LOAD( "wd-u2",   0x0c000, 0x2000, CRC(dfca1578) SHA1(6bc00bb2913edeaecd885fee449b8a9955c509bf) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "wd-u4",  0x10000, 0x20000, CRC(05c97f64) SHA1(36913e92943c6bb40521ab13c843691a8db4cbc9) )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "wd-u4",  0x00000, 0x20000, CRC(05c97f64) SHA1(36913e92943c6bb40521ab13c843691a8db4cbc9) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "wd-u1",  0x00000, 0x20000, CRC(5ebe0fd0) SHA1(4a948c9784433e051f1015a6b6e985a98b81b80d) )
@@ -1384,11 +1397,8 @@ ROM_START( pc_drmro )   /* Dr Mario */
 	ROM_LOAD( "vu-u2",   0x0c000, 0x2000, CRC(4b7869ac) SHA1(37afb84d963233ad92cc424fcf992aa76ea0599f) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "vu-u4",  0x10000, 0x08000, CRC(cb02a930) SHA1(6622564abc5ce28f523b0da95054d1ea825f7bd5) )    /* banked */
-	ROM_RELOAD(         0x18000, 0x08000 )
-	ROM_RELOAD(         0x20000, 0x08000 )
-	ROM_RELOAD(         0x28000, 0x08000 )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "vu-u4",  0x0000, 0x8000, CRC(cb02a930) SHA1(6622564abc5ce28f523b0da95054d1ea825f7bd5) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "vu-u1",  0x00000, 0x08000, CRC(064d4ab3) SHA1(bcdc34435bf631422ea2701f00744a3606c6dce8) )
@@ -1405,11 +1415,8 @@ ROM_START( pc_virus )   /* Virus (from location test board) */
 	ROM_LOAD( "u2",   0x0c000, 0x2000, CRC(d2764d91) SHA1(393b54148e9250f14d83318aed6686cc04b923e6) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "virus 3-12-90.u4",  0x10000, 0x08000, CRC(a5239a77) SHA1(f1e79906bcbee4e0c62036d6ba95385b95daa53f) )    /* banked */
-	ROM_RELOAD(         0x18000, 0x08000 )
-	ROM_RELOAD(         0x20000, 0x08000 )
-	ROM_RELOAD(         0x28000, 0x08000 )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "virus 3-12-90.u4",  0x0000, 0x8000, CRC(a5239a77) SHA1(f1e79906bcbee4e0c62036d6ba95385b95daa53f) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "virus 3-12-90.u1",  0x00000, 0x08000, CRC(d233c2ae) SHA1(0de301894edfc50b26b6e4cf3697a15065035c5e) )
@@ -1426,9 +1433,9 @@ ROM_START( pc_bload )   /* Bases Loaded (from location test board) */
 	ROM_LOAD( "new game 1.u2",   0x0c000, 0x2000, CRC(43879cc5) SHA1(dfde35e255825fffc22b5495c1e3bc1cfad7e9c0) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "u3",  0x10000, 0x20000, CRC(14a77a61) SHA1(6283f0dc8e9a2bbcd7ed452aa30cf646a6526837) )    /* banked */
-	ROM_LOAD( "bases loaded 9a70 prg-h.u4",  0x30000, 0x20000, CRC(f158f941) SHA1(e58bdcfb62d25348f5c81b2cf8001fc2c9e04eb2) )    /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "u3",  0x00000, 0x20000, CRC(14a77a61) SHA1(6283f0dc8e9a2bbcd7ed452aa30cf646a6526837) )    /* banked */
+	ROM_LOAD( "bases loaded 9a70 prg-h.u4",  0x20000, 0x20000, CRC(f158f941) SHA1(e58bdcfb62d25348f5c81b2cf8001fc2c9e04eb2) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "u1",  0x00000, 0x20000, CRC(02ff6ae9) SHA1(ba15b91f917c9e722d1d8b24b5783bd5eac6a4e7) )
@@ -1442,8 +1449,8 @@ ROM_START( pc_ftqst )   /* Fester's Quest */
 	ROM_LOAD( "eq-u2",   0x0c000, 0x2000, CRC(85326040) SHA1(866bd15e77d911147b191c13d062cef7ae4dcf62) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "eq-u4",  0x10000, 0x20000, CRC(953a3eaf) SHA1(a22c0a64d63036b6b8d147994a3055e1040a5282) )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "eq-u4",  0x00000, 0x20000, CRC(953a3eaf) SHA1(a22c0a64d63036b6b8d147994a3055e1040a5282) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "eq-u1",  0x00000, 0x20000, CRC(0ca17ab5) SHA1(a8765d6245f64b2d94c454662a24f8d8e277aa5a) )
@@ -1457,11 +1464,8 @@ ROM_START( pc_rcpam )   /* RC Pro Am */
 	ROM_LOAD( "pm-u2",   0x0c000, 0x2000, CRC(358c2de7) SHA1(0f37d7e8303a7b87ad0584c6e0a79f3029c529f8) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "pm-u4",  0x10000, 0x08000, CRC(82cfde25) SHA1(4eb9abe896e597f8ecabb4f044d8c4b545a51b11) )    /* banked */
-	ROM_RELOAD(         0x18000, 0x08000 )
-	ROM_RELOAD(         0x20000, 0x08000 )
-	ROM_RELOAD(         0x28000, 0x08000 )
+	ROM_REGION( 0x8000, "prg", 0 )
+	ROM_LOAD( "pm-u4",  0x0000, 0x8000, CRC(82cfde25) SHA1(4eb9abe896e597f8ecabb4f044d8c4b545a51b11) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "pm-u1",  0x00000, 0x08000, CRC(83c90d47) SHA1(26917e1e016d2be0fa48d766d332779aae12b053) )
@@ -1478,8 +1482,8 @@ ROM_START( pc_rrngr )   /* Rescue Rangers */
 	ROM_LOAD( "ru-u2",   0x0c000, 0x2000, CRC(2a4bfc4b) SHA1(87f58659d43a236af22682df4bd01593b69c9975) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "ru-u4",  0x10000, 0x20000, CRC(02931525) SHA1(28ddca5d299e7894e3c3aa0a193684ca3e384ee9) )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "ru-u4",  0x00000, 0x20000, CRC(02931525) SHA1(28ddca5d299e7894e3c3aa0a193684ca3e384ee9) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "ru-u1",  0x00000, 0x20000, CRC(218d4224) SHA1(37a729021173bec08a8497ad03fd58379b0fce39) )
@@ -1493,8 +1497,8 @@ ROM_START( pc_ynoid )   /* Yo! Noid */
 	ROM_LOAD( "yc-u2",   0x0c000, 0x2000, CRC(0449805c) SHA1(3f96687eae047d1f8095fbb55c0659c9b0e10166) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "yc-u4",  0x10000, 0x20000, CRC(4affeee7) SHA1(54da2aa7ca56d9b593c8bcabf0bb1d701439013d) )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "yc-u4",  0x00000, 0x20000, CRC(4affeee7) SHA1(54da2aa7ca56d9b593c8bcabf0bb1d701439013d) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "yc-u1",  0x00000, 0x20000, CRC(868f7343) SHA1(acb6f6eb9e8beb0636c59a999c8f5920ef7786a3) )
@@ -1508,8 +1512,8 @@ ROM_START( pc_tmnt )    /* Teenage Mutant Ninja Turtles */
 	ROM_LOAD( "u2u2",   0x0c000, 0x2000, CRC(bdce58c0) SHA1(abaf89c0ac55cce816a7c6542a868ab47e02d550) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "u4u2",   0x10000, 0x20000, CRC(0ccd28d5) SHA1(05606cafba838eeb36198b5e5e9d11c3729971b3) )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u4u2",   0x00000, 0x20000, CRC(0ccd28d5) SHA1(05606cafba838eeb36198b5e5e9d11c3729971b3) )    /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "u1u2",   0x00000, 0x20000, CRC(91f01f53) SHA1(171ed0792f3ca3f195145000d96b91aa57898773) )
@@ -1523,8 +1527,8 @@ ROM_START( pc_bstar )   /* Baseball Stars */
 	ROM_LOAD( "b9-u2",   0x0c000, 0x2000, CRC(69f3fd7c) SHA1(1cfaa40f18b1455bb41ec0e57d6a227ed3e582eb) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "b9-u4",   0x10000, 0x20000, CRC(d007231a) SHA1(60690eaeacb79dbcab7dfe1c1e40da1aac235793) )   /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "b9-u4",   0x00000, 0x20000, CRC(d007231a) SHA1(60690eaeacb79dbcab7dfe1c1e40da1aac235793) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "b9-u1",   0x00000, 0x20000, CRC(ce149864) SHA1(00c88525756a360f42b27f0e2afaa0a19c2645a6) )
@@ -1538,8 +1542,8 @@ ROM_START( pc_tbowl )   /* Tecmo Bowl */
 	ROM_LOAD( "tw-u2",   0x0c000, 0x2000, CRC(162aa313) SHA1(d0849ce87969c077fc14790ce5658e9857035413) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x30000, "cart", 0 )
-	ROM_LOAD( "tw-u4",   0x10000, 0x20000, CRC(4f0c69be) SHA1(c0b09dc81070b935b3c621b07deb62dfa521a396) )   /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "tw-u4",   0x00000, 0x20000, CRC(4f0c69be) SHA1(c0b09dc81070b935b3c621b07deb62dfa521a396) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "tw-u1",   0x00000, 0x20000, CRC(44b078ef) SHA1(ae0c24f4ddd822b19c60e31257279b33b5f3fcad) )
@@ -1554,9 +1558,9 @@ ROM_START( pc_smb3 )    /* Super Mario Bros 3 */
 	ROM_LOAD( "u3um",    0x0c000, 0x2000, CRC(45e92f7f) SHA1(9071d5f18639ac58d6d4d72674856f9ecab911f0) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "u4um",    0x10000, 0x20000, CRC(590b4d7c) SHA1(ac45940b71215a3a48983e22e1c7e71a71642b91) )   /* banked */
-	ROM_LOAD( "u5um",    0x30000, 0x20000, CRC(bce25425) SHA1(69468643a3a8b9220d675e2cdc4245ada81a492c) )   /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "u4um",    0x00000, 0x20000, CRC(590b4d7c) SHA1(ac45940b71215a3a48983e22e1c7e71a71642b91) )   /* banked */
+	ROM_LOAD( "u5um",    0x20000, 0x20000, CRC(bce25425) SHA1(69468643a3a8b9220d675e2cdc4245ada81a492c) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "u1um",    0x00000, 0x20000, CRC(c2928c49) SHA1(2697d1f21b72a6d8e7d2a2d2c51c9c5550f68b56) )
@@ -1570,9 +1574,8 @@ ROM_START( pc_gntlt )   /* Gauntlet */
 	ROM_LOAD( "u3gl",    0x0c000, 0x2000, CRC(57575b92) SHA1(7ac633f253496f353d388bef30e6ec74a3d18814) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "gl-0.prg",0x10000, 0x20000, CRC(b19c48a5) SHA1(4ba8674cec6fa8b0b4d96a7b00d4883a9e58a0a9) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "gl-0.prg",0x00000, 0x20000, CRC(b19c48a5) SHA1(4ba8674cec6fa8b0b4d96a7b00d4883a9e58a0a9) )   /* banked */
 
 	ROM_REGION( 0x010000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "gl-0.chr", 0x00000, 0x10000, CRC(22af8849) SHA1(01054943c1d069f5f535e93f969a5b6bfb958e0b) )
@@ -1586,9 +1589,8 @@ ROM_START( pc_pwbld )   /* Power Blade */
 	ROM_LOAD( "7t-u3",    0x0c000, 0x2000, CRC(edcc21c6) SHA1(5d73c6a747cfe951dc7c6ddfbb29859e9548aded) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "7t-u5",   0x10000, 0x20000, CRC(faa957b1) SHA1(612c4823ed588652a78017096a6d76dd8064807a) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "7t-u5",   0x00000, 0x20000, CRC(faa957b1) SHA1(612c4823ed588652a78017096a6d76dd8064807a) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "7t-u1",    0x00000, 0x20000, CRC(344be4a6) SHA1(2894292544f4315df44cda1bdc96047453da03e8) )
@@ -1602,9 +1604,8 @@ ROM_START( pc_ngai3 )   /* Ninja Gaiden 3 */
 	ROM_LOAD( "u33n",    0x0c000, 0x2000, CRC(c7ba0f59) SHA1(a4822035a10a2b5de3517b461dd357b2fa5da917) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "u53n",    0x10000, 0x20000, CRC(f0c77dcb) SHA1(bda1184e27f3c3e92e58519508dd281b06c70d9b) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "u53n",    0x00000, 0x20000, CRC(f0c77dcb) SHA1(bda1184e27f3c3e92e58519508dd281b06c70d9b) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "u13n",    0x00000, 0x20000, CRC(584bcf5d) SHA1(f4582e2a382c8424f839e848e95e88a7f46307dc) )
@@ -1622,9 +1623,8 @@ ROM_START( pc_ttoon )   /* Tiny Toon Adventures */
 	ROM_LOAD( "tt-gm2.u3",   0x0c000, 0x2000, CRC(d2764d91) SHA1(393b54148e9250f14d83318aed6686cc04b923e6) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "tt-prg.u5",    0x10000, 0x20000, CRC(9cb55b96) SHA1(437c326a4575895b9d7e567cab4f70b2f44ed8dd) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "tt-prg.u5",    0x00000, 0x20000, CRC(9cb55b96) SHA1(437c326a4575895b9d7e567cab4f70b2f44ed8dd) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "tt-chr.u1",    0x00000, 0x20000, CRC(a024ae14) SHA1(2e797a173161a61c14ce299e3c5a31c6029f2b50) )
@@ -1639,11 +1639,8 @@ ROM_START( pc_radr2 )   /* Rad Racer II */
 	ROM_LOAD( "qr-u3",    0x0c000, 0x2000, CRC(0c8fea63) SHA1(7ac04b151df732bd16708655352b7f13926f004f) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "qr-u5",    0x10000, 0x10000, CRC(ab90e397) SHA1(0956f7d9a216549dbd80b1dbf2653b36a320d0ab) )  /* banked */
-	ROM_RELOAD(           0x20000, 0x10000 )
-	ROM_RELOAD(           0x30000, 0x10000 )
-	ROM_RELOAD(           0x40000, 0x10000 )
+	ROM_REGION( 0x10000, "prg", 0 )
+	ROM_LOAD( "qr-u5",    0x00000, 0x10000, CRC(ab90e397) SHA1(0956f7d9a216549dbd80b1dbf2653b36a320d0ab) )  /* banked */
 
 	ROM_REGION( 0x010000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "qr-u1",    0x00000, 0x10000, CRC(07df55d8) SHA1(dd0fa0a79d30eb04917d7309a62adfb037ef9ca5) )
@@ -1657,9 +1654,8 @@ ROM_START( pc_rkats )   /* Rockin' Kats */
 	ROM_LOAD( "7a-u3",    0x0c000, 0x2000, CRC(352b1e3c) SHA1(bb72b586ec4b482aef462b017de5662d83631df1) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "7a-u5",    0x10000, 0x20000, CRC(319ccfcc) SHA1(06e1c34af917b84a990db895c7b44df1b3393c96) )  /* banked */
-	ROM_RELOAD(           0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "7a-u5",    0x00000, 0x20000, CRC(319ccfcc) SHA1(06e1c34af917b84a990db895c7b44df1b3393c96) )  /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "7a-u1",    0x00000, 0x20000, CRC(487aa440) SHA1(ee7ebbcf89c81ba59beda1bd27289dae21bb8071) )
@@ -1673,9 +1669,8 @@ ROM_START( pc_suprc )   /* Super C */
 	ROM_LOAD( "ue-u3",    0x0c000, 0x2000, CRC(a30ca248) SHA1(19feb1b4f749768773e0d24777d7e60b2b6260e2) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "ue-u5",    0x10000, 0x20000, CRC(c7fbecc3) SHA1(2653456c91031dfa73a50cab3835068a7bface8d) )  /* banked */
-	ROM_RELOAD(           0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "ue-u5",    0x00000, 0x20000, CRC(c7fbecc3) SHA1(2653456c91031dfa73a50cab3835068a7bface8d) )  /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "ue-u1",    0x00000, 0x20000, CRC(153295c1) SHA1(4ff1caaedca52fb9bb0ca6c8fac24edda77308d7) )
@@ -1689,8 +1684,8 @@ ROM_START( pc_tmnt2 )   /* Teenage Mutant Ninja Turtles II */
 	ROM_LOAD( "2n-u3",    0x0c000, 0x2000, CRC(65298370) SHA1(fd120f43e465a2622f2e2679ace2fb0fe7e709b1) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "2n-u5",    0x10000, 0x40000, CRC(717e1c46) SHA1(b49cc88e026dac7f5ba96f5c16bcb897addbe259) )  /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "2n-u5",    0x00000, 0x40000, CRC(717e1c46) SHA1(b49cc88e026dac7f5ba96f5c16bcb897addbe259) )  /* banked */
 
 	ROM_REGION( 0x040000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "2n-u1",    0x00000, 0x40000, CRC(0dbc575f) SHA1(8094278cf3267757953ab761dbccf38589142376) )
@@ -1704,9 +1699,8 @@ ROM_START( pc_wcup )    /* Nintendo World Cup */
 	ROM_LOAD( "xz-u3",    0x0c000, 0x2000, CRC(c26cb22f) SHA1(18fea97b498812915bbd53a20b4f0a2130de6faf) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "xz-u5",    0x10000, 0x20000, CRC(314ee295) SHA1(0a5963feb5a6b47f0e7bea5bdd3d5835300af7b6) )  /* banked */
-	ROM_RELOAD(           0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "xz-u5",    0x00000, 0x20000, CRC(314ee295) SHA1(0a5963feb5a6b47f0e7bea5bdd3d5835300af7b6) )  /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "xz-u1",    0x00000, 0x20000, CRC(92477d53) SHA1(33225bd5ee72f92761fdce931c93dd54e6885bd4) )
@@ -1720,9 +1714,9 @@ ROM_START( pc_mman3 )   /* Mega Man 3 */
 	ROM_LOAD( "xu-u3",   0x0c000, 0x2000, CRC(c3984e09) SHA1(70d7e5d9cf9b1f358e1be84a0e8c5997b1aae2d9) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "xu-u4",   0x10000, 0x20000, CRC(98a3263c) SHA1(02c8d8301fb220c3f4fd82bdc8cd2388b975fd05) )   /* banked */
-	ROM_LOAD( "xu-u5",   0x30000, 0x20000, CRC(d365647a) SHA1(4f39de6249c5f8b7cfa34bc955fd7ea6251569b5) )   /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "xu-u4",   0x00000, 0x20000, CRC(98a3263c) SHA1(02c8d8301fb220c3f4fd82bdc8cd2388b975fd05) )   /* banked */
+	ROM_LOAD( "xu-u5",   0x20000, 0x20000, CRC(d365647a) SHA1(4f39de6249c5f8b7cfa34bc955fd7ea6251569b5) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "xu-u1",    0x00000, 0x20000, CRC(4028916e) SHA1(f986f72ba5284129620d31c0779ac6d50638e6f1) )
@@ -1736,9 +1730,8 @@ ROM_START( pc_smb2 )    /* Super Mario Bros 2 */
 	ROM_LOAD( "mw-u3",   0x0c000, 0x2000, CRC(beaeb43a) SHA1(c7dd186d6167e39924a000eb80bd33beedb2b8c8) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "mw-u5",   0x10000, 0x20000, CRC(07854b3f) SHA1(9bea58ba97730c84232a4acbb23c3ea7bce14ec5) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "mw-u5",   0x00000, 0x20000, CRC(07854b3f) SHA1(9bea58ba97730c84232a4acbb23c3ea7bce14ec5) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "mw-u1",    0x00000, 0x20000, CRC(f2ba1170) SHA1(d9976b677ad222b76fbdaf31713374e2f283d44e) )
@@ -1752,9 +1745,8 @@ ROM_START( pc_ngai2 )   /* Ninja Gaiden 2 */
 	ROM_LOAD( "nw-u3",   0x0c000, 0x2000, CRC(bc178cde) SHA1(2613f501f92d358f0085aa7002c752cb9a8521ca) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "nw-u5",   0x10000, 0x20000, CRC(c43da8e2) SHA1(702a4cf2f57fff7183f2d3c18b8997a38cadc6cd) )   /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "nw-u5",   0x00000, 0x20000, CRC(c43da8e2) SHA1(702a4cf2f57fff7183f2d3c18b8997a38cadc6cd) )   /* banked */
 
 	ROM_REGION( 0x020000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "nw-u1",    0x00000, 0x20000, CRC(8e0c8bb0) SHA1(6afe24b8e57f5a2174000a706b66209d7e310ed6) )
@@ -1769,9 +1761,8 @@ ROM_START( pc_pinbt )   /* PinBot */
 	ROM_LOAD( "io-u3",   0x0c000, 0x2000, CRC(15ba8a2e) SHA1(e64180b2f12189e3ac1e155f3544f28af8003f97) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "io-u5",   0x10000, 0x20000, CRC(9f75b83b) SHA1(703e41d4c1a4716b324dece6df2ce12a847f082c) )   /* banked */
-	ROM_RELOAD(           0x30000, 0x20000 )    /* banked */
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "io-u5",   0x00000, 0x20000, CRC(9f75b83b) SHA1(703e41d4c1a4716b324dece6df2ce12a847f082c) )   /* banked */
 
 	ROM_REGION( 0x010000, "gfx2", 0 )   /* cart gfx */
 	ROM_LOAD( "io-u1",    0x00000, 0x10000, CRC(9089fc24) SHA1(0bc92a0853c5ebc47c3adbc4e919ea41a55297d0) )
@@ -1786,9 +1777,8 @@ ROM_START( pc_cshwk )   /* Captain Sky Hawk */
 	ROM_LOAD( "yw-u3",   0x0c000, 0x2000, CRC(9d988209) SHA1(b355911d31dfc611b9e90cca82fc10035483b89c) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "yw-u1",   0x10000, 0x20000, CRC(a5e0208a) SHA1(e12086a3f1a3b5e9ec035cb778505e43f501416a) ) /* banked */
-	ROM_RELOAD(          0x30000, 0x20000 )
+	ROM_REGION( 0x20000, "prg", 0 )
+	ROM_LOAD( "yw-u1",   0x00000, 0x20000, CRC(a5e0208a) SHA1(e12086a3f1a3b5e9ec035cb778505e43f501416a) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1801,8 +1791,8 @@ ROM_START( pc_sjetm )   /* Solar Jetman */
 	ROM_LOAD( "lj-u3",   0x0c000, 0x2000, CRC(273d8e75) SHA1(b13b97545b39f6b0459440fb6594ebe03366dfc9) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "lj-u1",   0x10000, 0x40000, CRC(8111ba08) SHA1(caa4d1ab710bd766f8505ef24f5702dac6e988af) ) /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "lj-u1",   0x00000, 0x40000, CRC(8111ba08) SHA1(caa4d1ab710bd766f8505ef24f5702dac6e988af) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1817,8 +1807,8 @@ ROM_START( pc_moglf )   /* Mario Open Golf */
 	ROM_LOAD( "ug-u2",   0x0c000, 0x2000, CRC(e932fe2b) SHA1(563380482525fdadd05fced2af61d5198d1654a5) ) /* extra bios code for this game */
 	BIOS_GFX
 
-	ROM_REGION( 0x50000, "cart", 0 )
-	ROM_LOAD( "ug-u4",   0x10000, 0x40000, CRC(091a6a4c) SHA1(2d5ac7c65ce63d409b6e0b2e2185d81bc7c57c69) ) /* banked */
+	ROM_REGION( 0x40000, "prg", 0 )
+	ROM_LOAD( "ug-u4",   0x00000, 0x40000, CRC(091a6a4c) SHA1(2d5ac7c65ce63d409b6e0b2e2185d81bc7c57c69) ) /* banked */
 
 	/* No cart gfx - uses vram */
 
@@ -1835,7 +1825,7 @@ ROM_END
 ROM_START( playch10 )
 	BIOS_CPU
 	BIOS_GFX
-	ROM_REGION( 0x50000, "cart", ROMREGION_ERASE00 )
+	ROM_REGION( 0x10000, "prg", ROMREGION_ERASE00 )
 ROM_END
 
 /******************************************************************************/
@@ -1914,7 +1904,7 @@ GAME( 1988, pc_cntra, playch10, playch10_b, playch10, playch10_state, init_pcbbo
 GAME( 1986, pc_goons, playch10, playch10_c, playch10, playch10_state, init_pccboard, ROT0, "Konami",                                   "The Goonies (PlayChoice-10)", 0 )
 
 /* D-Board Games */
-GAME( 1986, pc_mtoid, playch10, playch10_d2,playch10, playch10_state, init_pcdboard_2, ROT0, "Nintendo",                               "Metroid (PlayChoice-10)", 0 )
+GAME( 1986, pc_mtoid, playch10, playch10_d2,playch10, playch10_state, init_pcdboard, ROT0, "Nintendo",                                 "Metroid (PlayChoice-10)", 0 )
 GAME( 1987, pc_radrc, playch10, playch10_d, playch10, playch10_state, init_pcdboard, ROT0, "Square",                                   "Rad Racer (PlayChoice-10)", MACHINE_IMPERFECT_GRAPHICS )
 
 /* E-Board Games */
@@ -1926,7 +1916,7 @@ GAME( 1988, pc_ddrgn, playch10, playch10_f, playch10, playch10_state, init_pcfbo
 GAME( 1989, pc_ngaid, playch10, playch10_f, playch10, playch10_state, init_pcfboard, ROT0, "Tecmo (Nintendo of America license)",      "Ninja Gaiden (PlayChoice-10)", 0 )
 GAME( 1989, pc_tmnt,  playch10, playch10_f, playch10, playch10_state, init_pcfboard, ROT0, "Konami (Nintendo of America license)",     "Teenage Mutant Ninja Turtles (PlayChoice-10)", 0 )
 GAME( 1989, pc_ftqst, playch10, playch10_f, playch10, playch10_state, init_pcfboard, ROT0, "Sunsoft (Nintendo of America license)",    "Uncle Fester's Quest: The Addams Family (PlayChoice-10)", 0 )
-GAME( 1989, pc_bstar, playch10, playch10_f2,playch10, playch10_state, init_pcfboard_2, ROT0, "SNK (Nintendo of America license)",      "Baseball Stars: Be a Champ! (PlayChoice-10)", MACHINE_IMPERFECT_GRAPHICS )
+GAME( 1989, pc_bstar, playch10, playch10_f2,playch10, playch10_state, init_pcfboard, ROT0, "SNK (Nintendo of America license)",        "Baseball Stars: Be a Champ! (PlayChoice-10)", MACHINE_IMPERFECT_GRAPHICS )
 GAME( 1989, pc_tbowl, playch10, playch10_f, playch10, playch10_state, init_pcfboard, ROT0, "Tecmo (Nintendo of America license)",      "Tecmo Bowl (PlayChoice-10)", 0 )
 GAME( 1990, pc_virus, pc_drmro, playch10_f, playch10, playch10_state, init_virus,    ROT0, "Nintendo",                                 "Virus (Dr. Mario prototype, PlayChoice-10)", 0 )
 GAME( 1990, pc_rrngr, playch10, playch10_f, playch10, playch10_state, init_pcfboard, ROT0, "Capcom USA (Nintendo of America license)", "Chip'n Dale: Rescue Rangers (PlayChoice-10)", 0 )
diff --git a/src/mame/includes/playch10.h b/src/mame/includes/playch10.h
index 6eef1bd1c3e..d2e8985acf5 100644
--- a/src/mame/includes/playch10.h
+++ b/src/mame/includes/playch10.h
@@ -23,6 +23,8 @@ public:
 		, m_ram_8w(*this, "ram_8w")
 		, m_videoram(*this, "videoram")
 		, m_gfxdecode(*this, "gfxdecode")
+		, m_prg_banks(*this, "prg%u", 0U)
+		, m_prg_view(*this, "prg_view")
 		, m_vrom_region(*this, "gfx2")
 		, m_timedigits(*this, "digit_%u", 0U)
 	{
@@ -48,10 +50,8 @@ public:
 	void init_pcbboard();
 	void init_pccboard();
 	void init_pcdboard();
-	void init_pcdboard_2();
 	void init_pceboard();
 	void init_pcfboard();
-	void init_pcfboard_2();
 	void init_virus();
 	void init_ttoon();
 	void init_pcgboard();
@@ -150,6 +150,14 @@ private:
 	required_shared_ptr<uint8_t> m_videoram;
 	required_device<gfxdecode_device> m_gfxdecode;
 
+	void init_prg_banking();
+	void prg32(int bank);
+	void prg16(int slot, int bank);
+	void prg8(int slot, int bank);
+	memory_bank_array_creator<4> m_prg_banks;
+	memory_view m_prg_view;
+	int m_prg_chunks;
+
 	optional_memory_region m_vrom_region;
 
 	output_finder<4> m_timedigits;
@@ -173,14 +181,11 @@ private:
 	std::unique_ptr<uint8_t[]> m_vram;
 	uint8_t* m_nametable[4];
 	std::unique_ptr<uint8_t[]> m_nt_ram;
-	std::unique_ptr<uint8_t[]> m_extra_ram;
 	chr_bank m_chr_page[8];
 	int m_mmc1_shiftreg;
 	int m_mmc1_shiftcount;
-	int m_mmc1_rom_mask;
 	int m_gboard_banks[2];
 	int m_gboard_4screen;
-	int m_gboard_last_bank;
 	int m_gboard_command;
 	int m_IRQ_count;
 	uint8_t m_IRQ_count_latch;
diff --git a/src/mame/machine/playch10.cpp b/src/mame/machine/playch10.cpp
index 7ff2c77096e..3f2f763aca1 100644
--- a/src/mame/machine/playch10.cpp
+++ b/src/mame/machine/playch10.cpp
@@ -4,7 +4,6 @@
 #include "screen.h"
 #include "includes/playch10.h"
 
-#include "machine/nvram.h"
 #include "video/ppu2c0x.h"
 
 
@@ -52,10 +51,6 @@ void playch10_state::machine_start()
 	if (nullptr != m_vram)
 		set_videoram_bank(0, 8, 0, 8);
 	else pc10_set_videorom_bank(0, 8, 0, 8);
-
-	nvram_device *nvram = subdevice<nvram_device>("nvram");
-	if (nvram != nullptr)
-		nvram->set_base(memregion("cart")->base() + 0x6000, 0x1000);
 }
 
 MACHINE_START_MEMBER(playch10_state,playch10_hboard)
@@ -424,9 +419,6 @@ void playch10_state::init_pc_gun()
 	/* common init */
 	init_playch10();
 
-	/* we have no vram, make sure switching games doesn't point to an old allocation */
-	m_vram = nullptr;
-
 	/* set the control type */
 	m_pc10_gun_controller = 1;
 }
@@ -443,16 +435,56 @@ void playch10_state::init_pc_hrz()
 	m_mirroring = PPU_MIRROR_HORZ;
 }
 
-/* MMC1 mapper, used by D and F boards */
+// Init for games that bank PRG memory
 
+void playch10_state::init_prg_banking()
+{
+	// common init
+	init_playch10();
+
+	u8 *base = memregion("prg")->base();
+	m_prg_chunks = memregion("prg")->bytes() / 0x2000;
+
+	for (int i = 0; i < 4; i++)
+	{
+		m_prg_banks[i]->configure_entries(0, m_prg_chunks, base, 0x2000);
+		m_prg_banks[i]->set_entry(m_prg_chunks - 4 + i);
+	}
+
+	m_prg_view.select(0);
+}
+
+// safe banking helpers
+
+void playch10_state::prg32(int bank)
+{
+	bank = (bank << 2) & (m_prg_chunks - 1);
+
+	for (int i = 0; i < 4; i++)
+		m_prg_banks[i]->set_entry(bank + i);
+}
+
+void playch10_state::prg16(int slot, int bank)
+{
+	bank = (bank << 1) & (m_prg_chunks - 1);
+	slot = (slot & 1) << 1;
+
+	for (int i = 0; i < 2; i++)
+		m_prg_banks[slot + i]->set_entry(bank + i);
+}
+
+void playch10_state::prg8(int slot, int bank)
+{
+	m_prg_banks[slot & 0x03]->set_entry(bank & (m_prg_chunks - 1));
+}
+
+/* MMC1 mapper, used by D, F, and K boards */
 
 void playch10_state::mmc1_rom_switch_w(offs_t offset, uint8_t data)
 {
 	/* basically, a MMC1 mapper from the nes */
 	static int size16k, switchlow, vrom4k;
 
-	int reg = (offset >> 13);
-
 	/* reset mapper */
 	if (data & 0x80)
 	{
@@ -480,7 +512,7 @@ void playch10_state::mmc1_rom_switch_w(offs_t offset, uint8_t data)
 		m_mmc1_shiftcount = 0;
 
 		/* apply data to registers */
-		switch (reg)
+		switch (BIT(offset, 13, 2))
 		{
 			case 0:     /* mirroring and options */
 				{
@@ -533,30 +565,10 @@ void playch10_state::mmc1_rom_switch_w(offs_t offset, uint8_t data)
 			break;
 
 			case 3: /* program banking */
-				{
-					int bank = (m_mmc1_shiftreg & m_mmc1_rom_mask) * 0x4000;
-					uint8_t *prg = memregion("cart")->base();
-
-					if (!size16k)
-					{
-						/* switch 32k */
-						memcpy(&prg[0x08000], &prg[0x010000 + bank], 0x8000);
-					}
-					else
-					{
-						/* switch 16k */
-						if (switchlow)
-						{
-							/* low */
-							memcpy(&prg[0x08000], &prg[0x010000 + bank], 0x4000);
-						}
-						else
-						{
-							/* high */
-							memcpy(&prg[0x0c000], &prg[0x010000 + bank], 0x4000);
-						}
-					}
-				}
+				if (size16k)
+					prg16(!switchlow, m_mmc1_shiftreg);
+				else
+					prg32(m_mmc1_shiftreg >> 1);
 			break;
 		}
 	}
@@ -572,17 +584,8 @@ void playch10_state::aboard_vrom_switch_w(uint8_t data)
 
 void playch10_state::init_pcaboard()
 {
-	/* switches vrom with writes to the $803e-$8041 area */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0x8fff, write8smo_delegate(*this, FUNC(playch10_state::aboard_vrom_switch_w)));
-
 	/* common init */
 	init_playch10();
-
-	/* set the mirroring here */
-	m_mirroring = PPU_MIRROR_VERT;
-
-	/* we have no vram, make sure switching games doesn't point to an old allocation */
-	m_vram = nullptr;
 }
 
 /**********************************************************************************/
@@ -590,31 +593,17 @@ void playch10_state::init_pcaboard()
 
 void playch10_state::bboard_rom_switch_w(uint8_t data)
 {
-	int bankoffset = 0x10000 + ((data & 7) * 0x4000);
-	uint8_t *prg = memregion("cart")->base();
-
-	memcpy(&prg[0x08000], &prg[bankoffset], 0x4000);
+	prg16(0, data);
 }
 
 void playch10_state::init_pcbboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x28000], 0x8000);
-
-	/* Roms are banked at $8000 to $bfff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8smo_delegate(*this, FUNC(playch10_state::bboard_rom_switch_w)));
-
-	/* common init */
-	init_playch10();
+	// point program banks to last 32K
+	init_prg_banking();
 
 	/* allocate vram */
 	m_vram = std::make_unique<uint8_t[]>(0x2000);
 
-	/* set the mirroring here */
-	m_mirroring = PPU_MIRROR_VERT;
 	/* special init */
 	set_videoram_bank(0, 8, 0, 8);
 }
@@ -624,60 +613,26 @@ void playch10_state::init_pcbboard()
 
 void playch10_state::cboard_vrom_switch_w(uint8_t data)
 {
-	pc10_set_videorom_bank(0, 8, ((data >> 1) & 1), 8);
+	pc10_set_videorom_bank(0, 8, BIT(data, 1), 8);
 }
 
 void playch10_state::init_pccboard()
 {
-	/* switches vrom with writes to $6000 */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x6000, 0x6000, write8smo_delegate(*this, FUNC(playch10_state::cboard_vrom_switch_w)));
-
-	/* we have no vram, make sure switching games doesn't point to an old allocation */
-	m_vram = nullptr;
-
 	/* common init */
 	init_playch10();
 }
 
 /**********************************************************************************/
-/* D Board games (Rad Racer) */
+/* D Board games (Rad Racer, Metroid) */
 
 void playch10_state::init_pcdboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x28000], 0x8000);
-
-	m_mmc1_rom_mask = 0x07;
-
-	/* MMC mapper at writes to $8000-$ffff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::mmc1_rom_switch_w)));
-
-
-	/* common init */
-	init_playch10();
-	/* allocate vram */
-	m_vram = std::make_unique<uint8_t[]>(0x2000);
-	/* special init */
-	set_videoram_bank(0, 8, 0, 8);
-}
-
-/* D Board games with extra ram (Metroid) */
-
-void playch10_state::init_pcdboard_2()
-{
-	/* extra ram at $6000-$7fff */
-	m_extra_ram = std::make_unique<uint8_t[]>(0x2000);
-	save_pointer(NAME(m_extra_ram), 0x2000);
-	m_cartcpu->space(AS_PROGRAM).install_ram(0x6000, 0x7fff, m_extra_ram.get());
-
-	/* common init */
-	init_pcdboard();
+	// point program banks to last 32K
+	init_prg_banking();
 
 	/* allocate vram */
 	m_vram = std::make_unique<uint8_t[]>(0x2000);
+
 	/* special init */
 	set_videoram_bank(0, 8, 0, 8);
 }
@@ -686,7 +641,7 @@ void playch10_state::init_pcdboard_2()
 /* E Board games (Mike Tyson's Punchout) - BROKEN - FIX ME */
 
 /* callback for the ppu_latch */
-void playch10_state::mapper9_latch(offs_t offset )
+void playch10_state::mapper9_latch(offs_t offset)
 {
 	if((offset & 0x1ff0) == 0x0fd0 && m_MMC2_bank_latch[0] != 0xfd)
 	{
@@ -716,11 +671,7 @@ void playch10_state::eboard_rom_switch_w(offs_t offset, uint8_t data)
 	switch (offset & 0x7000)
 	{
 		case 0x2000: /* code bank switching */
-			{
-				int bankoffset = 0x10000 + (data & 0x0f) * 0x2000;
-				uint8_t *prg = memregion("cart")->base();
-				memcpy(&prg[0x08000], &prg[bankoffset], 0x2000);
-			}
+			prg8(0, data);
 		break;
 
 		case 0x3000: /* gfx bank 0 - 4k */
@@ -756,28 +707,11 @@ void playch10_state::eboard_rom_switch_w(offs_t offset, uint8_t data)
 
 void playch10_state::init_pceboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-
-	/* we have no vram, make sure switching games doesn't point to an old allocation */
-	m_vram = nullptr;
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x28000], 0x8000);
-
-	/* basically a mapper 9 on a nes */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::eboard_rom_switch_w)));
+	// point program banks to last 32K
+	init_prg_banking();
 
 	/* ppu_latch callback */
 	m_ppu->set_latch(*this, FUNC(playch10_state::mapper9_latch));
-
-	/* nvram at $6000-$6fff */
-	m_extra_ram = std::make_unique<uint8_t[]>(0x1000);
-	save_pointer(NAME(m_extra_ram), 0x1000);
-	m_cartcpu->space(AS_PROGRAM).install_ram(0x6000, 0x6fff, m_extra_ram.get());
-
-	/* common init */
-	init_playch10();
 }
 
 /**********************************************************************************/
@@ -785,38 +719,8 @@ void playch10_state::init_pceboard()
 
 void playch10_state::init_pcfboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-	uint32_t len = memregion("cart")->bytes();
-
-	/* we have no vram, make sure switching games doesn't point to an old allocation */
-	m_vram = nullptr;
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x28000], 0x8000);
-
-	m_mmc1_rom_mask = ((len - 0x10000) / 0x4000) - 1;
-
-	/* MMC mapper at writes to $8000-$ffff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::mmc1_rom_switch_w)));
-
-	/* common init */
-	init_playch10();
-}
-
-/* F Board games with extra ram (Baseball Stars) */
-
-void playch10_state::init_pcfboard_2()
-{
-	/* extra ram at $6000-$6fff */
-	m_extra_ram = std::make_unique<uint8_t[]>(0x1000);
-	save_pointer(NAME(m_extra_ram), 0x1000);
-	m_cartcpu->space(AS_PROGRAM).install_ram(0x6000, 0x6fff, m_extra_ram.get());
-
-	m_vram = nullptr;
-
-	/* common init */
-	init_pcfboard();
+	// point program banks to last 32K
+	init_prg_banking();
 }
 
 /**********************************************************************************/
@@ -848,35 +752,11 @@ void playch10_state::gboard_rom_switch_w(offs_t offset, uint8_t data)
 	{
 		case 0x0000:
 			m_gboard_command = data;
-
-			if (m_gboard_last_bank != (data & 0xc0))
 			{
-				int bank;
-				uint8_t *prg = memregion("cart")->base();
-
-				/* reset the banks */
-				if (m_gboard_command & 0x40)
-				{
-					/* high bank */
-					bank = m_gboard_banks[0] * 0x2000 + 0x10000;
-
-					memcpy(&prg[0x0c000], &prg[bank], 0x2000);
-					memcpy(&prg[0x08000], &prg[0x4c000], 0x2000);
-				}
-				else
-				{
-					/* low bank */
-					bank = m_gboard_banks[0] * 0x2000 + 0x10000;
-
-					memcpy(&prg[0x08000], &prg[bank], 0x2000);
-					memcpy(&prg[0x0c000], &prg[0x4c000], 0x2000);
-				}
-
-				/* mid bank */
-				bank = m_gboard_banks[1] * 0x2000 + 0x10000;
-				memcpy(&prg[0x0a000], &prg[bank], 0x2000);
-
-				m_gboard_last_bank = data & 0xc0;
+				// reset the flippable banks
+				int flip = BIT(m_gboard_command, 6) << 1;
+				prg8(0 ^ flip, m_gboard_banks[0]);
+				prg8(2 ^ flip, m_prg_chunks - 2);
 			}
 		break;
 
@@ -884,7 +764,6 @@ void playch10_state::gboard_rom_switch_w(offs_t offset, uint8_t data)
 			{
 				uint8_t cmd = m_gboard_command & 0x07;
 				int page = (m_gboard_command & 0x80) >> 5;
-				int bank;
 
 				switch (cmd)
 				{
@@ -905,37 +784,17 @@ void playch10_state::gboard_rom_switch_w(offs_t offset, uint8_t data)
 
 					case 6: /* program banking */
 					{
-						uint8_t *prg = memregion("cart")->base();
-						if (m_gboard_command & 0x40)
-						{
-							/* high bank */
-							m_gboard_banks[0] = data & 0x1f;
-							bank = (m_gboard_banks[0]) * 0x2000 + 0x10000;
+						m_gboard_banks[0] = data;
 
-							memcpy(&prg[0x0c000], &prg[bank], 0x2000);
-							memcpy(&prg[0x08000], &prg[0x4c000], 0x2000);
-						}
-						else
-						{
-							/* low bank */
-							m_gboard_banks[0] = data & 0x1f;
-							bank = (m_gboard_banks[0]) * 0x2000 + 0x10000;
-
-							memcpy(&prg[0x08000], &prg[bank], 0x2000);
-							memcpy(&prg[0x0c000], &prg[0x4c000], 0x2000);
-						}
+						int flip = BIT(m_gboard_command, 6) << 1;
+						prg8(0 ^ flip, m_gboard_banks[0]);
+						prg8(2 ^ flip, m_prg_chunks - 2);
 					}
 					break;
 
-					case 7: /* program banking */
-						{
-							/* mid bank */
-							uint8_t *prg = memregion("cart")->base();
-							m_gboard_banks[1] = data & 0x1f;
-							bank = m_gboard_banks[1] * 0x2000 + 0x10000;
-
-							memcpy(&prg[0x0a000], &prg[bank], 0x2000);
-						}
+					case 7: // program banking - mid bank
+						m_gboard_banks[1] = data;
+						prg8(1, m_gboard_banks[1]);
 					break;
 				}
 			}
@@ -943,12 +802,7 @@ void playch10_state::gboard_rom_switch_w(offs_t offset, uint8_t data)
 
 		case 0x2000: /* mirroring */
 			if (!m_gboard_4screen)
-			{
-				if (data & 0x40)
-					pc10_set_mirroring(PPU_MIRROR_HIGH);
-				else
-					pc10_set_mirroring((data & 1) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
-			}
+				pc10_set_mirroring((data & 1) ? PPU_MIRROR_HORZ : PPU_MIRROR_VERT);
 		break;
 
 		case 0x2001: /* enable ram at $6000 */
@@ -976,37 +830,21 @@ void playch10_state::gboard_rom_switch_w(offs_t offset, uint8_t data)
 
 void playch10_state::init_pcgboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-	m_vram = nullptr;
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x4c000], 0x4000);
-	memcpy(&prg[0x0c000], &prg[0x4c000], 0x4000);
-
-	/* MMC3 mapper at writes to $8000-$ffff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::gboard_rom_switch_w)));
-
-	/* extra ram at $6000-$7fff */
-	m_extra_ram = std::make_unique<uint8_t[]>(0x2000);
-	save_pointer(NAME(m_extra_ram), 0x2000);
-	m_cartcpu->space(AS_PROGRAM).install_ram(0x6000, 0x7fff, m_extra_ram.get());
+	// point program banks to last 32K
+	init_prg_banking();
 
 	m_gboard_banks[0] = 0x1e;
 	m_gboard_banks[1] = 0x1f;
 	m_gboard_4screen = 0;
+	m_gboard_command = 0;
 	m_IRQ_enable = 0;
 	m_IRQ_count = m_IRQ_count_latch = 0;
 
-	/* common init */
-	init_playch10();
-
 	m_ppu->set_scanline_callback(*this, FUNC(playch10_state::gboard_scanline_cb));
 }
 
 void playch10_state::init_pcgboard_type2()
 {
-	m_vram = nullptr;
 	/* common init */
 	init_pcgboard();
 
@@ -1015,42 +853,6 @@ void playch10_state::init_pcgboard_type2()
 	m_mirroring = PPU_MIRROR_NONE;
 }
 
-/**********************************************************************************/
-/* i Board games (Captain Sky Hawk, Solar Jetman) */
-
-void playch10_state::iboard_rom_switch_w(uint8_t data)
-{
-	int bank = data & 7;
-	uint8_t *prg = memregion("cart")->base();
-
-	if (data & 0x10)
-		pc10_set_mirroring(PPU_MIRROR_HIGH);
-	else
-		pc10_set_mirroring(PPU_MIRROR_LOW);
-
-	memcpy(&prg[0x08000], &prg[bank * 0x8000 + 0x10000], 0x8000);
-}
-
-void playch10_state::init_pciboard()
-{
-	uint8_t *prg = memregion("cart")->base();
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x10000], 0x8000);
-
-	/* Roms are banked at $8000 to $bfff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8smo_delegate(*this, FUNC(playch10_state::iboard_rom_switch_w)));
-
-	/* common init */
-	init_playch10();
-
-	/* allocate vram */
-	m_vram = std::make_unique<uint8_t[]>(0x2000);
-	/* special init */
-	set_videoram_bank(0, 8, 0, 8);
-}
-
 /**********************************************************************************/
 /* H Board games (PinBot) */
 
@@ -1102,24 +904,32 @@ void playch10_state::hboard_rom_switch_w(offs_t offset, uint8_t data)
 
 void playch10_state::init_pchboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-	memcpy(&prg[0x08000], &prg[0x4c000], 0x4000);
-	memcpy(&prg[0x0c000], &prg[0x4c000], 0x4000);
+	// common init
+	init_pcgboard();
+}
 
-	/* Roms are banked at $8000 to $bfff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::hboard_rom_switch_w)));
+/**********************************************************************************/
+/* i Board games (Captain Sky Hawk, Solar Jetman) */
 
-	m_gboard_banks[0] = 0x1e;
-	m_gboard_banks[1] = 0x1f;
-	m_gboard_last_bank = 0xff;
-	m_gboard_command = 0;
-	m_IRQ_enable = 0;
-	m_IRQ_count = m_IRQ_count_latch = 0;
+void playch10_state::iboard_rom_switch_w(uint8_t data)
+{
+	prg32(data);
 
-	/* common init */
-	init_playch10();
+	pc10_set_mirroring(BIT(data, 4) ? PPU_MIRROR_HIGH : PPU_MIRROR_LOW);
+}
 
-	m_ppu->set_scanline_callback(*this, FUNC(playch10_state::gboard_scanline_cb));
+void playch10_state::init_pciboard()
+{
+	// point program banks to last 32K
+	init_prg_banking();
+
+	m_mirroring = PPU_MIRROR_LOW;
+
+	/* allocate vram */
+	m_vram = std::make_unique<uint8_t[]>(0x2000);
+
+	/* special init */
+	set_videoram_bank(0, 8, 0, 8);
 }
 
 /**********************************************************************************/
@@ -1127,27 +937,6 @@ void playch10_state::init_pchboard()
 
 void playch10_state::init_pckboard()
 {
-	uint8_t *prg = memregion("cart")->base();
-
-	/* We do manual banking, in case the code falls through */
-	/* Copy the initial banks */
-	memcpy(&prg[0x08000], &prg[0x48000], 0x8000);
-
-	m_mmc1_rom_mask = 0x0f;
-
-	/* extra ram at $6000-$7fff */
-	m_extra_ram = std::make_unique<uint8_t[]>(0x2000);
-	save_pointer(NAME(m_extra_ram), 0x2000);
-	m_cartcpu->space(AS_PROGRAM).install_ram(0x6000, 0x7fff, m_extra_ram.get());
-
-	/* Roms are banked at $8000 to $bfff */
-	m_cartcpu->space(AS_PROGRAM).install_write_handler(0x8000, 0xffff, write8sm_delegate(*this, FUNC(playch10_state::mmc1_rom_switch_w)));
-
-	/* common init */
-	init_playch10();
-
-	/* allocate vram */
-	m_vram = std::make_unique<uint8_t[]>(0x2000);
-	/* special init */
-	set_videoram_bank(0, 8, 0, 8);
+	// later board but similar to D boards, i.e. MMC1 + 8K VRAM
+	init_pcdboard();
 }