diff --git a/Source/Apps/assign.asm b/Source/Apps/assign.asm
index 258573e8..757859f4 100644
--- a/Source/Apps/assign.asm
+++ b/Source/Apps/assign.asm
@@ -244,7 +244,7 @@ initcpm3:
 ; The CP/M 3 drvtbl is in common memory, but the XDPHs are not.
 ; So, here we temporarily swap the bank to the CP/M 3 system
 ; bank.  We cannot use the CP/M Direct BIOS call because it
-; explicitly blocks use of SELMEM, so we are foreced to use
+; explicitly blocks use of SELMEM, so we are forced to use
 ; HBIOS call.  The CP/M 3 system bank is always the HBIOS
 ; user bank.
 ;
diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 2dde8d29..1d596dbd 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/Source/HBIOS/ay38910.asm
@@ -534,7 +534,7 @@ AY_EI:
 AY_WRTPSG:
 	CALL	AY_DI
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; GET CURRENT RTC LATCH VALUE
+	LD	A,(HB_RTCVAL)		; GET CURRENT RTC LATCH VALUE
 	OR	%00001000		; SBC-V2-004 CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 #ENDIF
@@ -553,7 +553,7 @@ AY_WRTPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI
@@ -565,7 +565,7 @@ AY_WRTPSG:
 AY_RDPSG:
 	CALL	AY_DI
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; GET CURRENT RTC LATCH VALUE
+	LD	A,(HB_RTCVAL)		; GET CURRENT RTC LATCH VALUE
 	OR	%00001000		; SBC-V2-004 CHANGE
 	OUT	(RTCIO),A		; TO HALF CLOCK SPEED
 #ENDIF
@@ -584,7 +584,7 @@ AY_RDPSG:
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
 #IFDEF SBCV2004
-	LD	A,(RTCVAL)		; SBC-V2-004 CHANGE TO
+	LD	A,(HB_RTCVAL)		; SBC-V2-004 CHANGE TO
 	OUT	(RTCIO),A		; NORMAL CLOCK SPEED
 #ENDIF
 	JP	AY_EI
diff --git a/Source/HBIOS/dbgmon.asm b/Source/HBIOS/dbgmon.asm
index 7467519f..fde7110b 100644
--- a/Source/HBIOS/dbgmon.asm
+++ b/Source/HBIOS/dbgmon.asm
@@ -38,6 +38,8 @@ ENA_XM	.EQU	FALSE			; NO ROOM FOR BOTH DSKY+XMODEM
 ENA_XM	.EQU	TRUE			; INCLUDE XMODEM IF SPACE AVAILABLE
 #ENDIF
 ;
+ENA_MBC6502	.EQU	FALSE		; ENABLE OR DISABLE MBC6502 OPTION
+;
 #INCLUDE "util.asm"
 ;
 ;__UART_ENTRY_________________________________________________________________
@@ -69,6 +71,8 @@ UART_ENTRY:
 ; R XXXX		- RUN A PROGRAM AT ADDRESS XXXX
 ; S XX			- SET ACTIVE BANK TO XX
 ; T XXXX 		- X-MODEM TRANSFER TO MEMORY LOCATION XXXX
+; U 			- SET BANK TO PREVIOUS BANK
+; 6 XX                  - TRANSFER CONTROL TO MBC6502 UNIT XX
 ; X			- EXIT MONITOR
 ;
 ;__COMMAND_PARSE______________________________________________________________
@@ -126,6 +130,12 @@ SERIALCMDLOOP:
 #IF (BIOS == BIOS_WBW)
 	CP	'S'			; IS IT A "S" (Y/N)
 	JP	Z,SETBNK		; SET BANK COMMAND
+	CP	'U'			; IS IT A "U" (Y/N)
+	JP	Z,UNSETBNK		; UNSET (REVERT) BANK COMMAND		
+#ENDIF
+#IF ((PLATFORM = PLT_MBC) & ENA_MBC6502)
+	CP	'6'			; IS IT A "6" (Y/N)
+	JP	Z,MBC6502		; TRANSFER TO MBC6502 COMMAND
 #ENDIF
 	CP	'X'			; IS IT A "X" (Y/N)
 	JP	Z,EXIT			; EXIT COMMAND
@@ -218,6 +228,8 @@ SETBNK:
 	LD	HL,TXT_IMERR
 	CALL	PRTSTR
 #ELSE
+	LD	A,($FFE0)		; GET AND SAVE
+	LD	(BNKSAV),A		; CURRENT BANK
 	CALL	BYTEPARM		; GET BANK NUMBER
 	JP	C,ERR			; HANDLE DATA ENTRY ERROR
 	LD	C,A			; PUT IN C FOR FOR FUNC CALL
@@ -226,6 +238,25 @@ SETBNK:
 #ENDIF
 	JP	SERIALCMDLOOP		; NEXT COMMAND
 ;
+;__UNSETBNK___________________________________________________________________
+;
+;	PERFORM UNSET BANK ACTION - REVERT TO BANK BEFORE PREVIOUS SET
+;_____________________________________________________________________________
+;
+UNSETBNK:
+#IF (INTMODE == 1)
+	LD	HL,TXT_IMERR
+	CALL	PRTSTR
+#ELSE
+	LD	A,(BNKSAV)
+	LD	C,A			; PUT IN C FOR FOR FUNC CALL
+	LD	B,BF_SYSSETBNK		; SET BANK FUNCTION
+	CALL	$FFF0			; C HAS BANK, DO IT
+#ENDIF
+	JP	SERIALCMDLOOP		; NEXT COMMAND
+;
+BNKSAV	.DB	00H			; OLD BANK FROM BEFORE SET
+;
 #ENDIF
 ;
 ;__RUN________________________________________________________________________
@@ -358,7 +389,8 @@ XMLOAD:	CALL	WORDPARM		; GET STARTING LOCATION
 	CALL	NEWLINE
 ;
 	LD	BC,$F8F0		; GET CPU SPEED
-	RST	08			; AND MULTIPLY
+	CALL	$FFF0			; CALL HBIOS
+;	RST	08			; AND MULTIPLY
 	LD	A,L			; BY 4
 	PUSH	AF
 	ADD	A,A			; TO CREATE
@@ -769,6 +801,28 @@ HELP:
 	CALL	PRTSTR			; DISPLAY IT
 	JP	SERIALCMDLOOP		; AND BACK TO COMMAND LOOP
 ;
+;__MBC6502____________________________________________________________________
+;
+;	TRANSFER CONTROL TO MBC6502
+;_____________________________________________________________________________
+;
+;
+#IF ((PLATFORM = PLT_MBC) & ENA_MBC6502)
+MBC6502:
+	CALL	BYTEPARM		; GET BYTE VALUE (FILL VALUE) INTO A
+	CPL				; UNIT 0 = FFH, 1 = FEH ETC
+	LD	C,A
+;
+	IN	A,(C)			; EXECUTE
+	NOP				; TRANSFER
+;
+	LD	A,($FFE0)		; GET PREVIOUS BANK
+	OUT	(MPCL_RAM),A		; SET RAM PAGE SELECTOR
+	OUT	(MPCL_ROM),A		; SET ROM PAGE SELECTOR
+;
+	JP	SERIALCMDLOOP		; AND BACK TO COMMAND LOOP
+#ENDIF
+;
 ;__ERR________________________________________________________________________
 ;
 ;	SYNTAX ERROR
@@ -1205,9 +1259,15 @@ TXT_HELP	.TEXT	"\r\nMonitor Commands (all values in hex):"
 		.TEXT	"\r\nP xxxx           - Program RAM at address xxxx"
 		.TEXT	"\r\nR xxxx [[yy] [zzzz]]  - Run code at address xxxx"
 		.TEXT	"\r\n                        Pass yy and zzzz to register A and BC"
+#IF (BIOS == BIOS_WBW)
 		.TEXT	"\r\nS xx             - Set bank to xx"
+		.TEXT	"\r\nU                - Set bank to previous bank"
+#ENDIF
 #IF (ENA_XM)
 		.TEXT	"\r\nT xxxx           - X-modem transfer to memory location xxxx"
+#ENDIF
+#IF ((PLATFORM == PLT_MBC) & ENA_MBC6502)
+		.TEXT	"\r\n6 xx             - Transfer control to MBC6502 unit xx"
 #ENDIF
 		.TEXT	"\r\nX                - Exit monitor"
 		.TEXT	"$"
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index c9757d51..c3dc3a0c 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -2299,6 +2299,18 @@ NXTMIO:	LD	A,(HL)
 	CALL	PRTSTRD
 	.TEXT	"HBIOS MUTEX ENABLED$"
 #ENDIF
+;
+; DISPLAY RECOVERY MODE MESSAGE
+;
+#IF (BT_REC_TYPE != BT_REC_NONE)
+	LD	A,(HB_BOOT_REC)		; IF WE ARE IN RECOVERY MODE
+	OR	A			; DISPLAY RECOVERY MODE MESSAGE
+	JR	Z,NOT_REC_M2
+	CALL	NEWLINE
+	CALL	PRTSTRD
+	.TEXT	"RECOVERY MODE$"
+#ENDIF
+NOT_REC_M2:
 ;
 	DIAG(%11111111)
 ;
@@ -3698,7 +3710,7 @@ SND_ADDENT:
 ;	WORD	UNIT SPECIFIC DATA (TYPICALLY A DEVICE INSTANCE DATA ADDRESS)
 ;
 SND_FNCNT	.EQU	8		; NUMBER OF SND FUNCS (FOR RANGE CHECK)
-SND_MAX		.EQU	3		; UP TO 2 UNITS
+SND_MAX		.EQU	4		; UP TO 3 UNITS
 SND_SIZ		.EQU	SND_MAX * 4	; EACH ENTRY IS 4 BYTES
 ;
 		.DB	SND_FNCNT	; SND FUNCTION COUNT (FOR RANGE CHECK)
@@ -5233,7 +5245,7 @@ HB_ADDENT:
 ; ALL OTHER REGISTERS PRESERVED
 ;
 ; A 4 BYTE HEADER IS PLACED IN FRONT OF THE ALLOCATED MEMORY
-;  - DWORD: SIZE OF MEMROY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
+;  - DWORD: SIZE OF MEMORY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
 ;  - DWORD: ADDRESS WHERE ALLOC WAS CALLED (VALUE ON TOP OF STACK AT CALL)
 ;
 HB_ALLOC:
diff --git a/Source/HBIOS/sn76489.asm b/Source/HBIOS/sn76489.asm
index e7aa315b..60cb1ca8 100644
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -43,6 +43,9 @@ SN7RATIO	.EQU	SN7CLK * 100 / 32
 
 SN76489_INIT:
 	LD	IY, SN7_IDAT		; POINTER TO INSTANCE DATA
+	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
+	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
+	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED
 
 	LD	DE,STR_MESSAGELT
 	CALL	WRITESTR
@@ -53,11 +56,6 @@ SN76489_INIT:
 	CALL	WRITESTR
 	LD	A, SN76489_PORT_RIGHT
 	CALL	PRTHEXBYTE
-;
-SN7_INIT1:
-	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
-	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
-	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED
 
 	CALL	SN7_VOLUME_OFF
 	XOR	A			; SIGNAL SUCCESS
@@ -67,7 +65,6 @@ SN7_INIT1:
 ; SN76489 DRIVER - SOUND ADAPTER (SND) FUNCTIONS
 ;======================================================================
 ;
-
 SN7_RESET:
 	AUDTRACE(SNT_INIT)
 	CALL	SN7_VOLUME_OFF