diff --git a/src/mame/drivers/1943.c b/src/mame/drivers/1943.c
index c8b794eab7e..e4688db7d02 100644
--- a/src/mame/drivers/1943.c
+++ b/src/mame/drivers/1943.c
@@ -52,10 +52,7 @@ static READ8_HANDLER( c1943_protection_r )
 
 static ADDRESS_MAP_START( c1943_map, AS_PROGRAM, 8 )
 	AM_RANGE(0x0000, 0x7fff) AM_ROM
-	AM_RANGE(0x8000, 0x8fff) AM_ROMBANK("bank1")
-	AM_RANGE(0x9000, 0x9fff) AM_ROMBANK("bank2")
-	AM_RANGE(0xa000, 0xafff) AM_ROMBANK("bank3")
-	AM_RANGE(0xb000, 0xbfff) AM_ROMBANK("bank4")
+	AM_RANGE(0x8000, 0xbfff) AM_ROMBANK("bank1")
 	AM_RANGE(0xc000, 0xc000) AM_READ_PORT("SYSTEM")
 	AM_RANGE(0xc001, 0xc001) AM_READ_PORT("P1")
 	AM_RANGE(0xc002, 0xc002) AM_READ_PORT("P2")
@@ -648,10 +645,7 @@ ROM_END
 static DRIVER_INIT( 1943 )
 {
 	UINT8 *ROM = machine.region("maincpu")->base();
-	memory_configure_bank(machine, "bank1", 0, 29, &ROM[0x10000], 0x1000);
-	memory_configure_bank(machine, "bank2", 0, 29, &ROM[0x11000], 0x1000);
-	memory_configure_bank(machine, "bank3", 0, 29, &ROM[0x12000], 0x1000);
-	memory_configure_bank(machine, "bank4", 0, 29, &ROM[0x13000], 0x1000);
+	memory_configure_bank(machine, "bank1", 0, 8, &ROM[0x10000], 0x4000);
 }
 
 static READ8_HANDLER( _1943b_c007_r ) { return 0; }
diff --git a/src/mame/video/1943.c b/src/mame/video/1943.c
index 090df34be3a..8dcb9bcb665 100644
--- a/src/mame/video/1943.c
+++ b/src/mame/video/1943.c
@@ -137,18 +137,13 @@ WRITE8_HANDLER( c1943_colorram_w )
 WRITE8_HANDLER( c1943_c804_w )
 {
 	_1943_state *state = space->machine().driver_data<_1943_state>();
-	int bank;
 
 	/* bits 0 and 1 are coin counters */
 	coin_counter_w(space->machine(), 0, data & 0x01);
 	coin_counter_w(space->machine(), 1, data & 0x02);
 
 	/* bits 2, 3 and 4 select the ROM bank */
-	bank = data & 0x1c;
-	memory_set_bank(space->machine(), "bank1", bank);
-	memory_set_bank(space->machine(), "bank2", bank);
-	memory_set_bank(space->machine(), "bank3", bank);
-	memory_set_bank(space->machine(), "bank4", bank);
+	memory_set_bank(space->machine(), "bank1", (data & 0x1c) >> 2);
 
 	/* bit 5 resets the sound CPU - we ignore it */