diff --git a/Source/Apps/Tune/tune.asm b/Source/Apps/Tune/tune.asm
index 513c21d4..4659f556 100644
--- a/Source/Apps/Tune/tune.asm
+++ b/Source/Apps/Tune/tune.asm
@@ -622,6 +622,9 @@ CFGTBL:	;	PLT	RSEL	RDAT	RIN	Z180	ACR
 ;
 	.DB	$0B,	$33,	$32,	$32,	$FF,	$FF	; RCZ280 W/ LINC SOUND MODULE
 	.DW	HWSTR_LINC
+;
+	.DB	13,	$A0,	$A1,	$A0,	$FF,	$A2	; MBC
+	.DW	HWSTR_MBC
 ;
 	.DB	$FF					; END OF TABLE MARKER
 ;
@@ -674,6 +677,7 @@ HWSTR_RCEB	.DB	"RC2014 Sound Module (EB)",0
 HWSTR_RCEB6	.DB	"RC2014 Sound Module (EBv6)",0
 HWSTR_RCMF	.DB	"RC2014 Sound Module (MF)",0
 HWSTR_LINC	.DB	"Z50 LiNC Sound Module",0
+HWSTR_MBC	.DB	"NHYODYNE Sound Module",0
 
 MSGUNSUP	.db	"MYM files not supported with HBIOS yet!\r\n", 0
 
@@ -2649,4 +2653,3 @@ data:
 ;
 ;===============================================================================
 	.END
-
diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 3a196605..2dde8d29 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -48,6 +48,14 @@ AY_RDAT		.EQU	$32
 AY_RIN		.EQU	$32
 #ENDIF
 ;
+#IF (AYMODE == AYMODE_MBC)
+AY_RSEL		.EQU	$A0
+AY_RDAT		.EQU	$A1
+AY_RIN		.EQU	AY_RSEL
+AY_ACR		.EQU	$A2
+AY_CLK		.SET	3579545 	; MSX NTSC COLOUR BURST FREQ = 315/88
+#ENDIF
+;
 ;======================================================================
 ;
 ;	REGISTERS
@@ -128,6 +136,10 @@ AY38910_INIT:
 	PRTS(" MODE=MSX$")
 #ENDIF
 ;
+#IF (AYMODE == AYMODE_MBC)
+	PRTS(" MODE=MBC$")
+#ENDIF
+;
 #IF (AYMODE == AYMODE_LINC)
 	PRTS(" MODE=LINC$")
 #ENDIF
@@ -136,7 +148,7 @@ AY38910_INIT:
 	LD	A,AY_RSEL
 	CALL	PRTHEXBYTE
 ;
-#IF ((AYMODE == AYMODE_SCG) | (AYMODE == AYMODE_N8))
+#IF ((AYMODE == AYMODE_SCG) | (AYMODE == AYMODE_N8) | (AYMODE == AYMODE_MBC))
 	LD	A,$FF			; ACTIVATE DEVICE BIT 4 IS AY RESET CONTROL, BIT 3 IS ACTIVE LED
 	OUT	(AY_ACR),A		; SET INIT AUX CONTROL REG
 #ENDIF
diff --git a/Source/HBIOS/cfg_dyno.asm b/Source/HBIOS/cfg_dyno.asm
index 71983d85..7be37bcb 100644
--- a/Source/HBIOS/cfg_dyno.asm
+++ b/Source/HBIOS/cfg_dyno.asm
@@ -125,7 +125,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_DYNO	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -194,7 +194,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 022236ca..59ee6c98 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -163,7 +163,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -236,7 +236,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_master.asm b/Source/HBIOS/cfg_master.asm
index 8e17d028..42a39766 100644
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -308,7 +308,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_mbc.asm b/Source/HBIOS/cfg_mbc.asm
index e17de8c3..a5cae23b 100644
--- a/Source/HBIOS/cfg_mbc.asm
+++ b/Source/HBIOS/cfg_mbc.asm
@@ -152,7 +152,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
@@ -240,7 +240,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_NONE	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	TRUE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index 14f9a8f2..2732bd39 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -151,7 +151,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_DIDE	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -241,7 +241,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_SCG	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_SCG	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index 070298a6..47dab164 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -153,7 +153,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_N8	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -239,7 +239,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_N8	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_N8	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index d9306673..63000248 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -169,7 +169,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -251,7 +251,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_RCZ180	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_RCZ180	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_rcz280.asm b/Source/HBIOS/cfg_rcz280.asm
index 65214adc..e79d56c7 100644
--- a/Source/HBIOS/cfg_rcz280.asm
+++ b/Source/HBIOS/cfg_rcz280.asm
@@ -185,7 +185,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -267,7 +267,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 00e56501..8c4e8454 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -174,7 +174,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -256,7 +256,7 @@ SNMODE		.EQU	SNMODE_RCZ80	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index f55d0b5d..2f7bedff 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -152,7 +152,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
@@ -240,7 +240,7 @@ SNMODE		.EQU	SNMODE_VGM	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_SCG	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_SCG	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_scz180.asm b/Source/HBIOS/cfg_scz180.asm
index 3e4bdd4e..3fc39a3d 100644
--- a/Source/HBIOS/cfg_scz180.asm
+++ b/Source/HBIOS/cfg_scz180.asm
@@ -164,7 +164,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
@@ -246,7 +246,7 @@ SNMODE		.EQU	SNMODE_NONE	; DRIVER MODE: SNMODE_[NONE|RC2014|VGM]
 ;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-AYMODE		.EQU	AYMODE_RCZ180	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
+AYMODE		.EQU	AYMODE_RCZ180	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC|MBC]
 ;
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
 ;
diff --git a/Source/HBIOS/cfg_zeta2.asm b/Source/HBIOS/cfg_zeta2.asm
index 42970e1b..da495739 100644
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -135,7 +135,7 @@ MDENABLE	.EQU	TRUE		; MD: ENABLE MEMORY (ROM/RAM) DISK DRIVER (MD.ASM)
 MDROM		.EQU	TRUE		; MD: ENABLE ROM DISK
 MDRAM		.EQU	TRUE		; MD: ENABLE RAM DISK
 MDTRACE		.EQU	1		; MD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
-MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM 
+MDFFENABLE	.EQU	FALSE		; MD: ENABLE FLASH FILE SYSTEM
 ;
 FDENABLE	.EQU	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.EQU	FDMODE_ZETA2	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPFDC|MBC]
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 51669aad..3c5b330d 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -193,6 +193,7 @@ AYMODE_RCZ80	.EQU	3		; RC2014 SOUND MODULE BY ED BRINDLEY ON Z80
 AYMODE_RCZ180	.EQU	4		; RC2014 SOUND MODULE BY ED BRINDLEY ON Z180
 AYMODE_MSX	.EQU	5		; RC2014 SOUND MODULE REV6 BY ED BRINDLEY ON Z80/Z180 AT MSX PORTS
 AYMODE_LINC	.EQU	6		; LINC Z50 AY SOUND CARD
+AYMODE_MBC	.EQU	7		; MBC SOUND BOARD
 ;
 ; SN SOUND CHIP MODE SELECTIONS
 ;