diff --git a/src/mess/drivers/msx.c b/src/mess/drivers/msx.c
index 6c36cdb192d..55cf05feee1 100644
--- a/src/mess/drivers/msx.c
+++ b/src/mess/drivers/msx.c
@@ -3199,11 +3199,11 @@ MSX_LAYOUT_INIT (msx2)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( msx2_gen, msx2_pal )
 	MCFG_MSX_LAYOUT(msx2)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	MCFG_FRAGMENT_ADD( msx2_2_cartslots )
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
 	MCFG_FRAGMENT_ADD( msx_1_35_dd_drive )
@@ -3233,11 +3233,11 @@ MSX_LAYOUT_INIT (ax350)
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 1, 1, 1, DISK_ROM2, 0x4000, 0x40000) /* Disk */
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( ax350, msx2_pal )
 	MCFG_MSX_LAYOUT(ax350)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// AY8910/YM2149?
 	// FDC: wd2793/tc8566af?, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -3270,11 +3270,11 @@ MSX_LAYOUT_INIT (ax370)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000,  0x20000)  /* Arab */
 	//MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0x40000) /* TC8566AF Disk controller*/
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, ROM, 0x10000, 0x30000)  /* Paint */
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( ax370, msx2_pal )
 	MCFG_MSX_LAYOUT(ax370)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -3301,11 +3301,11 @@ MSX_LAYOUT_INIT (cpc300)
 	MSX_LAYOUT_SLOT (0, 3, 0, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (1, 0, 0, 4, CARTRIDGE1, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cpc300, msx2 )
 	MCFG_MSX_LAYOUT(cpc300)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -3332,11 +3332,11 @@ MSX_LAYOUT_INIT (cpc300e)
 	MSX_LAYOUT_SLOT (0, 3, 0, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (1, 0, 0, 4, CARTRIDGE1, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cpc300e, msx2 )
 	MCFG_MSX_LAYOUT(cpc300e)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots?
@@ -3364,11 +3364,11 @@ MSX_LAYOUT_INIT (cpc400)
 	MSX_LAYOUT_SLOT (2, 0, 1, 1, DISK_ROM2, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cpc400, msx2 )
 	MCFG_MSX_LAYOUT(cpc400)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: mb8877a, 1 3.5" DS?DD drive
 	MCFG_FRAGMENT_ADD( msx_mb8877a )
@@ -3399,11 +3399,11 @@ MSX_LAYOUT_INIT (cpc400s)
 	MSX_LAYOUT_SLOT (2, 0, 1, 1, DISK_ROM2, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cpc400s, msx2 )
 	MCFG_MSX_LAYOUT(cpc400s)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: mb8877a, 1 3.5" DS?DD drive
 	MCFG_FRAGMENT_ADD( msx_mb8877a )
@@ -3433,11 +3433,11 @@ MSX_LAYOUT_INIT (expert20)
 	MSX_LAYOUT_SLOT (1, 3, 1, 1, DISK_ROM, 0x4000, 0x24000) /* Microsol controller */
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( expert20, msx2_pal )
 	MCFG_MSX_LAYOUT(expert20)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: microsol, 1? 3.5"? DS?DD drive
 	MCFG_FRAGMENT_ADD( msx_microsol )
@@ -3549,11 +3549,11 @@ MSX_LAYOUT_INIT (fs4600)
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM2, 0x4000, 0xc000)
 	MSX_LAYOUT_KANJI (0x30000)
 /*  MSX_LAYOUT_KANJI_12 (0x50000) */ /* Matsushita 12 dots Kanji ROM must be emulated */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fs4600, msx2 )
 	MCFG_MSX_LAYOUT(fs4600)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: mb8877a, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_mb8877a )
@@ -3638,11 +3638,11 @@ MSX_LAYOUT_INIT (fs5000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM2, 0x4000, 0xc000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fs5000, msx2 )
 	MCFG_MSX_LAYOUT(fs5000)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -3778,11 +3778,11 @@ MSX_LAYOUT_INIT (fsa1f)
 /*  MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000) */ /* FDC Emulation of TC8566AF must be emulated */
 	MSX_LAYOUT_SLOT (3, 3, 1, 2, ROM, 0x8000, 0x28000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1f, msx2 )
 	MCFG_MSX_LAYOUT(fsa1f)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -3816,11 +3816,11 @@ MSX_LAYOUT_INIT (fsa1fm)
 /*  MSX_LAYOUT_SLOT (3, 3, 0, 4, FSA1FM_ROM, 0x100000, 0x80000) */ /* Panasonic FS-A1FM Mapper must be emulated */
 	MSX_LAYOUT_KANJI (0x40000)
 /*  MSX_LAYOUT_KANJI_12 (0x60000) */ /* Matsushita 12 dots Kanji ROM must be emulated */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1fm, msx2 )
 	MCFG_MSX_LAYOUT(fsa1fm)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -3852,11 +3852,11 @@ MSX_LAYOUT_INIT (fsa1mk2)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (3, 2, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_SLOT (3, 3, 1, 2, ROM, 0x8000, 0x2c000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1mk2, msx2 )
 	MCFG_MSX_LAYOUT(fsa1mk2)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -3881,11 +3881,11 @@ MSX_LAYOUT_INIT (nms8220)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8220, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8220)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -3911,11 +3911,11 @@ MSX_LAYOUT_INIT (nms8220a)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8220a, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8220a)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -3924,6 +3924,9 @@ static MACHINE_CONFIG_DERIVED( nms8220a, msx2_pal )
 MACHINE_CONFIG_END
 
 /* MSX2 - Philips NMS-8245 - 2 possible sets (/00 /16) */
+/* /00 - A16 = 0 */
+/* /16 - A16 = 1 */
+/* /19 - Azerty keyboard */
 
 ROM_START (nms8245)
 	ROM_REGION (0x40000, "maincpu", 0)
@@ -3939,11 +3942,11 @@ MSX_LAYOUT_INIT (nms8245)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0x2c000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8245, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8245)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -3954,6 +3957,7 @@ static MACHINE_CONFIG_DERIVED( nms8245, msx2_pal )
 MACHINE_CONFIG_END
 
 /* MSX2 - Philips NMS-8245F */
+/* NMS-8245/19? */
 
 ROM_START (nms8245f)
 	ROM_REGION (0x40000, "maincpu", 0)
@@ -3969,11 +3973,11 @@ MSX_LAYOUT_INIT (nms8245f)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x38000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0x3c000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8245f, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8245f)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4002,11 +4006,11 @@ MSX_LAYOUT_INIT (nms8250)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8250, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8250)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4063,11 +4067,11 @@ MSX_LAYOUT_INIT (nms8255)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8255, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8255)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4095,11 +4099,11 @@ MSX_LAYOUT_INIT (nms8280)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8280, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8280)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// AY8910/YM2149?
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4126,11 +4130,11 @@ MSX_LAYOUT_INIT (nms8280g)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( nms8280g, msx2_pal )
 	MCFG_MSX_LAYOUT(nms8280g)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// AY8910/YM2149?
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4157,11 +4161,11 @@ MSX_LAYOUT_INIT (vg8230)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( vg8230, msx2_pal )
 	MCFG_MSX_LAYOUT(vg8230)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" SSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4220,11 +4224,11 @@ MSX_LAYOUT_INIT (vg8235)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( vg8235, msx2_pal )
 	MCFG_MSX_LAYOUT(vg8235)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" SSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4252,11 +4256,11 @@ MSX_LAYOUT_INIT (vg8235f)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( vg8235f, msx2_pal )
 	MCFG_MSX_LAYOUT(vg8235f)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// YM2149 (in S-3527 MSX Engine)
 	// FDC: wd2793, 1 3.5" SSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4284,11 +4288,11 @@ MSX_LAYOUT_INIT (vg8240)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, DISK_ROM, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0xf8)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( vg8240, msx2_pal )
 	MCFG_MSX_LAYOUT(vg8240)
+	MCFG_MSX_RAMIO_SET_BITS(0xf8)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4398,11 +4402,11 @@ MSX_LAYOUT_INIT (hotbit20)
 	MSX_LAYOUT_SLOT (1, 3, 1, 1, DISK_ROM, 0x4000, 0x24000) /* Microsol controller */
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hotbit20, msx2_pal )
 	MCFG_MSX_LAYOUT(hotbit20)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: microsol, 1 or 2 drives?
 	MCFG_FRAGMENT_ADD( msx_microsol )
@@ -4465,11 +4469,11 @@ MSX_LAYOUT_INIT (hbf12)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x24000)
 	MSX_LAYOUT_SLOT (3, 2, 1, 2, ROM, 0x8000, 0x2c000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf12, msx2 )
 	MCFG_MSX_LAYOUT(hbf12)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -4494,11 +4498,11 @@ MSX_LAYOUT_INIT (hbf1xd)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf1xd, msx2 )
 	MCFG_MSX_LAYOUT(hbf1xd)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1895 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4526,11 +4530,11 @@ MSX_LAYOUT_INIT (hbf1xdm2)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf1xdm2, msx2 )
 	MCFG_MSX_LAYOUT(hbf1xdm2)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4646,11 +4650,11 @@ MSX_LAYOUT_INIT (hbf700d)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf700d, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf700d)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4677,11 +4681,11 @@ MSX_LAYOUT_INIT (hbf700f)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf700f, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf700f)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4707,11 +4711,11 @@ MSX_LAYOUT_INIT (hbf700p)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf700p, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf700p)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4738,11 +4742,11 @@ MSX_LAYOUT_INIT (hbf700s)
 	MSX_LAYOUT_SLOT (3, 0, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf700s, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf700s)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4772,11 +4776,11 @@ MSX_LAYOUT_INIT (hbf900)
 	MSX_LAYOUT_SLOT (3, 1, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x10000)
 	MSX_LAYOUT_KANJI (0x24000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf900, msx2 )
 	MCFG_MSX_LAYOUT(hbf900)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4806,11 +4810,11 @@ MSX_LAYOUT_INIT (hbf900a)
 	MSX_LAYOUT_SLOT (3, 1, 0, 4, RAM_MM, 0x40000, 0x0000)   /* 256KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x10000)
 	MSX_LAYOUT_KANJI (0x24000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf900a, msx2 )
 	MCFG_MSX_LAYOUT(hbf900a)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4838,11 +4842,11 @@ MSX_LAYOUT_INIT (hbf9p)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf9p, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf9p)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -4894,11 +4898,11 @@ MSX_LAYOUT_INIT (hbf9s)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf9s, msx2_pal )
 	MCFG_MSX_LAYOUT(hbf9s)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -4934,11 +4938,11 @@ MSX_LAYOUT_INIT (hbg900ap)
 	MSX_LAYOUT_SLOT (1, 0, 0, 4, CARTRIDGE1, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, RAM_MM, 0x80000, 0x0000)   /* 512KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbg900ap, msx2_pal )
 	MCFG_MSX_LAYOUT(hbg900ap)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -4969,11 +4973,11 @@ MSX_LAYOUT_INIT (hbg900p)
 	MSX_LAYOUT_SLOT (1, 0, 0, 4, CARTRIDGE1, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbg900p, msx2_pal )
 	MCFG_MSX_LAYOUT(hbg900p)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -5002,11 +5006,11 @@ MSX_LAYOUT_INIT (tpc310)
 	MSX_LAYOUT_SLOT (3, 0, 1, 1, ROM, 0x4000, 0x20000)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x24000)
 	MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM2, 0x4000, 0xc000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( tpc310, msx2_pal )
 	MCFG_MSX_LAYOUT(tpc310)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: None, 0 drives
 	// 1 Cartridge slot (slot 2)
@@ -5085,11 +5089,11 @@ MSX_LAYOUT_INIT (hx23)
 	MSX_LAYOUT_SLOT (3, 0, 0, 2, RAM, 0x8000, 0x0000)   /* 32KB RAM */
 	MSX_LAYOUT_SLOT (3, 1, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, ROM, 0x10000, 0x20000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hx23, msx2_pal )
 	MCFG_MSX_LAYOUT(hx23)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots?
@@ -5115,11 +5119,11 @@ MSX_LAYOUT_INIT (hx23f)
 	MSX_LAYOUT_SLOT (3, 0, 0, 4, RAM_MM, 0x20000, 0x0000)   /* 128KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 1, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 3, 0, 4, ROM, 0x10000, 0x20000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hx23f, msx2_pal )
 	MCFG_MSX_LAYOUT(hx23f)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots?
@@ -5144,11 +5148,11 @@ MSX_LAYOUT_INIT (cx7m)
 	MSX_LAYOUT_SLOT (2, 0, 0, 4, CARTRIDGE2, 0x0000, 0x0000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 0, 2, ROM, 0x8000, 0x20000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cx7m, msx2_pal )
 	MCFG_MSX_LAYOUT(cx7m)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots?
@@ -5175,11 +5179,11 @@ MSX_LAYOUT_INIT (cx7m128)
 	MSX_LAYOUT_SLOT (3, 1, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_SLOT (3, 2, 0, 4, RAM_MM, 0x10000, 0x0000)   /* 64KB Mapper RAM */
 	MSX_LAYOUT_SLOT (3, 3, 0, 2, ROM, 0x8000, 0x20000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( cx7m128, msx2_pal )
 	MCFG_MSX_LAYOUT(cx7m128)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots?
@@ -5209,11 +5213,11 @@ MSX_LAYOUT_INIT (msx2p)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_KANJI (0x28000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( msx2pgen, msx2p )
 	MCFG_MSX_LAYOUT(msx2p)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	MCFG_FRAGMENT_ADD( msx2_2_cartslots )
 MACHINE_CONFIG_END
 
@@ -5369,11 +5373,11 @@ MSX_LAYOUT_INIT (fsa1fx)
 /*  MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000) */ /* FDC Emulation of TC8566AF must be emulated */
 	MSX_LAYOUT_SLOT (3, 3, 1, 2, ROM, 0x8000, 0x28000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1fx, msx2p )
 	MCFG_MSX_LAYOUT(fsa1fx)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5409,11 +5413,11 @@ MSX_LAYOUT_INIT (fsa1wsx)
 /*  MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000) */ /* FDC Emulation of TC8566AF must be emulated */
 /*  MSX_LAYOUT_SLOT (3, 3, 1, 4, PANASONIC08, 0x200000, 0x70000) */ /* Panasonic 08KB Mapper must be emulated */
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1wsx, msx2p )
 	MCFG_MSX_LAYOUT(fsa1wsx)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5450,11 +5454,11 @@ MSX_LAYOUT_INIT (fsa1wx)
 /*  MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000) */ /* FDC Emulation of TC8566AF must be emulated */
 /*  MSX_LAYOUT_SLOT (3, 3, 1, 4, PANASONIC08, 0x200000, 0x70000) */ /* Panasonic 08KB Mapper must be emulated */
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1wx, msx2p )
 	MCFG_MSX_LAYOUT(fsa1wx)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5490,11 +5494,11 @@ MSX_LAYOUT_INIT (fsa1wxa)
 /*  MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000) */ /* FDC Emulation of TC8566AF must be emulated */
 /*  MSX_LAYOUT_SLOT (3, 3, 1, 4, PANASONIC08, 0x200000, 0x70000) */ /* Panasonic 08KB Mapper must be emulated */
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( fsa1wxa, msx2p )
 	MCFG_MSX_LAYOUT(fsa1wxa)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5524,11 +5528,11 @@ MSX_LAYOUT_INIT (phc35j)
 	MSX_LAYOUT_SLOT (3, 1, 0, 1, ROM, 0x4000, 0x8000)
 	MSX_LAYOUT_SLOT (3, 1, 1, 2, ROM, 0x8000, 0x20000)
 	MSX_LAYOUT_KANJI (0x28000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( phc35j, msx2p )
 	MCFG_MSX_LAYOUT(phc35j)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: None, 0 drives
 	// 2 Cartridge slots
@@ -5561,11 +5565,11 @@ MSX_LAYOUT_INIT (phc70fd)
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_SLOT (3, 3, 2, 1, ROM, 0x4000, 0x2c000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( phc70fd, msx2p )
 	MCFG_MSX_LAYOUT(phc70fd)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5600,11 +5604,11 @@ MSX_LAYOUT_INIT (phc70fd2)
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_SLOT (3, 3, 2, 1, ROM, 0x4000, 0x2c000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( phc70fd2, msx2p )
 	MCFG_MSX_LAYOUT(phc70fd2)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// AY8910/YM2149?
 	// FDC: tc8566af, 2 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_tc8566af )
@@ -5641,11 +5645,11 @@ MSX_LAYOUT_INIT (hbf1xdj)
 	MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf1xdj, msx2p )
 	MCFG_MSX_LAYOUT(hbf1xdj)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drive
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
@@ -5683,11 +5687,11 @@ MSX_LAYOUT_INIT (hbf1xv)
 	MSX_LAYOUT_SLOT (3, 2, 1, 1, DISK_ROM, 0x4000, 0xc000)
 	MSX_LAYOUT_SLOT (3, 3, 1, 1, ROM, 0x4000, 0x28000)
 	MSX_LAYOUT_KANJI (0x30000)
-	MSX_LAYOUT_RAMIO_SET_BITS (0x80)
 MSX_LAYOUT_END
 
 static MACHINE_CONFIG_DERIVED( hbf1xv, msx2p )
 	MCFG_MSX_LAYOUT(hbf1xv)
+	MCFG_MSX_RAMIO_SET_BITS(0x80)
 	// YM2149 (in S-1985 MSX Engine)
 	// FDC: wd2793, 1 3.5" DSDD drives
 	MCFG_FRAGMENT_ADD( msx_wd2793 )
diff --git a/src/mess/includes/msx.h b/src/mess/includes/msx.h
index f2a5319f94a..668870c4687 100644
--- a/src/mess/includes/msx.h
+++ b/src/mess/includes/msx.h
@@ -39,6 +39,9 @@
 #define MCFG_MSX_LAYOUT(_layout) \
 	msx_state::set_layout(*owner, msx_slot_layout_##_layout);
 
+#define MCFG_MSX_RAMIO_SET_BITS(_ramio_set_bits) \
+	msx_state::set_ramio_set_bits(*owner, _ramio_set_bits);
+
 class msx_state : public driver_device
 {
 public:
@@ -84,6 +87,7 @@ public:
 
 	// static configuration helpers
 	static void set_layout(device_t &device, const msx_slot_layout *layout) { downcast<msx_state &>(device).m_layout = layout; }
+	static void set_ramio_set_bits(device_t &device, UINT8 ramio_set_bits) { downcast<msx_state &>(device).m_ramio_set_bits = ramio_set_bits; }
 
 	DECLARE_WRITE8_MEMBER(msx_page0_w);
 	DECLARE_WRITE8_MEMBER(msx_page0_1_w);
diff --git a/src/mess/includes/msx_slot.h b/src/mess/includes/msx_slot.h
index 1479504fc4f..53dc456e8a6 100644
--- a/src/mess/includes/msx_slot.h
+++ b/src/mess/includes/msx_slot.h
@@ -11,7 +11,6 @@
 enum {
 	MSX_LAYOUT_SLOT_ENTRY,
 	MSX_LAYOUT_KANJI_ENTRY,
-	MSX_LAYOUT_RAMIO_SET_BITS_ENTRY,
 	MSX_LAYOUT_LAST
 };
 
@@ -48,18 +47,6 @@ static const msx_slot_layout msx_slot_layout_##msx[] = {
 		offset                      \
 	},
 
-#define MSX_LAYOUT_RAMIO_SET_BITS(offset) \
-	{                               \
-		MSX_LAYOUT_RAMIO_SET_BITS_ENTRY,        \
-		SLOT_EMPTY,                 \
-		0,                          \
-		0,                          \
-		0,                          \
-		0,                          \
-		0,                          \
-		offset                      \
-	},
-
 #define MSX_LAYOUT_END \
 	{                               \
 		MSX_LAYOUT_LAST,            \
diff --git a/src/mess/machine/msx.c b/src/mess/machine/msx.c
index d6c6e988cb6..a2de4f555a1 100644
--- a/src/mess/machine/msx.c
+++ b/src/mess/machine/msx.c
@@ -870,9 +870,6 @@ void msx_state::msx_memory_init()
 		case MSX_LAYOUT_KANJI_ENTRY:
 			m_kanji_mem = m_region_maincpu->base() + layout->option;
 			break;
-		case MSX_LAYOUT_RAMIO_SET_BITS_ENTRY:
-			m_ramio_set_bits = (UINT8)layout->option;
-			break;
 		}
 	}
 }