diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 1420bbdf..e3e70a92 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -7,6 +7,9 @@ Version 2.9.2
 - WBW: Support two SIO modules w/ auto-detection
 - PMS: Support ECB USB-FIFO board
 - WBW: Fixed ASSIGN issue with incorrect DPB selection
+- WBW: Add RC2014 Z180 AY sound support to TUNE app
+- WBW: Add RC2014 AY sound support to AY driver
+- WBW: Add SC126 platform
 
 Version 2.9.1
 -------------
diff --git a/ReadMe.txt b/ReadMe.txt
index f60708bf..1e441f8d 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -7,7 +7,7 @@
 ***********************************************************************
 
 Wayne Warthen (wwarthen@gmail.com)
-Version 2.9.2-pre.3, 2019-08-07
+Version 2.9.2-pre.4, 2019-08-11
 https://www.retrobrewcomputers.org/
 
 RomWBW is a ROM-based implementation of CP/M-80 2.2 and Z-System for 
diff --git a/Source/Apps/RTC.asm b/Source/Apps/RTC.asm
index 9363ac0c..8101aa48 100644
--- a/Source/Apps/RTC.asm
+++ b/Source/Apps/RTC.asm
@@ -21,6 +21,8 @@
 ;
 ;[2019/06/21] v1.3 Finalized RC2014 Z180 support.
 ;
+;[2019/08/11] v1.4 Support SC126 platform.
+;
 ;
 ; Constants
 ;
@@ -34,6 +36,7 @@ PORT_N8		.EQU	$88		; RTC port for N8
 PORT_MK4	.EQU	$8A		; RTC port for MK4
 PORT_RCZ80	.EQU	$C0		; RTC port for RC2014
 PORT_RCZ180	.EQU	$0C		; RTC port for RC2014
+PORT_SC126	.EQU	$0C		; RTC port for SBC126
 PORT_EZZ80	.EQU	$C0		; RTC port for EZZ80 (actually does not have one!!!)
 
 BDOS		.EQU	5		; BDOS invocation vector
@@ -1078,6 +1081,10 @@ HINIT:
 	LD	DE,PLT_RCZ180
 	CP	$08		; RC2014 w/ Z180
 	JR	Z,RTC_INIT2
+	LD	C,PORT_SC126
+	LD	DE,PLT_SC126
+	CP	$0A		; SC126
+	JR	Z,RTC_INIT2
 	;LD	C,PORT_EZZ80
 	;LD	DE,PLT_EZZ80
 	;CP	$09		; Easy Z80
@@ -1545,7 +1552,7 @@ TESTING_BIT_DELAY_OVER:
 
 RTC_HELP_MSG:
 	.DB	0Ah, 0Dh		; line feed and carriage return
-	.TEXT	"RTC: Version 1.3"
+	.TEXT	"RTC: Version 1.4"
 	.DB	0Ah, 0Dh		; line feed and carriage return
 	.TEXT	"Commands: E)xit T)ime st(A)rt S)et R)aw L)oop C)harge N)ocharge D)elay I)nit G)et P)ut B)oot H)elp"
 	.DB	0Ah, 0Dh		; line feed and carriage return
@@ -1668,6 +1675,7 @@ PLT_N8		.TEXT	", N8 RTC Latch Port 0x88\r\n$"
 PLT_MK4		.TEXT	", Mark 4 RTC Latch Port 0x8A\r\n$"
 PLT_RCZ80	.TEXT	", RC2014 Z80 RTC Module Latch Port 0xC0\r\n$"
 PLT_RCZ180	.TEXT	", RC2014 Z180 RTC Module Latch Port 0x0C\r\n$"
+PLT_SC126	.TEXT	", SC126 Z180 RTC Module Latch Port 0x0C\r\n$"
 PLT_EZZ80	.TEXT	", Easy Z80 RTC Module Latch Port 0xC0\r\n$"
 
 ;
diff --git a/Source/Apps/Tune/Tune.asm b/Source/Apps/Tune/Tune.asm
index f5f1a7bc..f4f7f669 100644
--- a/Source/Apps/Tune/Tune.asm
+++ b/Source/Apps/Tune/Tune.asm
@@ -83,12 +83,18 @@ TYPMYM		.EQU	3		; FILTYP value for MYM sound file
 	; Use platform id to derive port addresses
 	LD	A,L			; Platform ID is still in L from above
 	LD	C,L			; Save platform id in C for now
-	LD	HL,$D0D8		; For RC2014, RSEL=D8, RDAT=D0
-	LD	DE,MSGRC		; Message for RC2014 platform
-	CP	7			; RC2014?
+	LD	HL,$D0D8		; For RC2014 Z80, RSEL=D8, RDAT=D0
+	LD	DE,MSGRCZ80		; Message for RC2014 Z80 platform
+	CP	7			; RC2014 Z80?
 	JR	Z,_SETP			; If so, set ports
 	LD	DE,MSGEZ		; Message for Easy Z80 platform
 	CP	9			; Easy Z80?
+	LD	HL,$6068		; For RC2014 Z180, RSEL=D8, RDAT=D0
+	LD	DE,MSGRCZ180		; Message for RC2014 Z180 platform
+	CP	8			; RC2014 Z80?
+	JR	Z,_SETP			; If so, set ports
+	LD	DE,MSGSC126		; Message for SC126 Z180 platform
+	CP	10			; SC126?
 	JR	Z,_SETP			; If so, same ports as RC2014
 	LD	HL,$9D9C		; For N8, RSEL=9C, RDAT=9D
 	LD	DE,MSGN8		; Message for N8 platform
@@ -590,37 +596,39 @@ ERR2:	; without the string
 	CALL	CRLF		; print newline
 	JP	0		; fast exit
 
-QDLY	.DW	0		; quark delay factor
-WMOD	.DB	0		; delay mode, non-zero to use timer
-DCSAV	.DB	0		; for saving Z180 DCNTL value
-DMA	.DW	0		; Working DMA
-FILTYP	.DB	0		; Sound file type (TYPPT2, TYPPT3, TYPMYM)
-
-TMP	.DB	0		; work around use of undocumented Z80
-
-PORTS:
-RSEL	.DB	0		; Register selection port
-RDAT	.DB	0		; Register data port
-	
-MSGBAN	.DB	"Tune Player for RomWBW v2.0, 28-Jan-2018",0
-MSGUSE	.DB	"Copyright (C) 2018, Wayne Warthen, GNU GPL v3",13,10
-	.DB	"PTxPlayer Copyright (C) 2004-2007 S.V.Bulba",13,10
-	.DB	"MYMPlay by Marq/Lieves!Tuore",13,10,13,10
-	.DB	"Usage: TUNE <filename>.[PT2|PT3|MYM]",0
-MSGBIO	.DB	"Incompatible BIOS or version, "
-	.DB	"HBIOS v", '0' + RMJ, ".", '0' + RMN, " required",0
-MSGHW	.DB	"Hardware error, sound chip not detected!",0
-MSGNAM	.DB	"Sound filename invalid (must be .PT2, .PT3, or .MYM)",0
-MSGFIL	.DB	"Sound file not found!",0
-MSGSIZ	.DB	"Sound file too large to load!",0
-MSGRC	.DB	"RC2014 w/ Ed Brindley Sound Module",0
-MSGEZ	.DB	"Easy Z80 w/ Ed Brindley Sound Module",0
-MSGN8	.DB	"RetroBrew N8 Onboard Sound System",0
-MSGSCG	.DB	"RetroBrew SCG ECB Adapter Sound System",0
-MSGTIM	.DB	", timer mode",0
-MSGDLY	.DB	", delay mode",0
-MSGPLY	.DB	"Playing...",0
-MSGEND	.DB	" Done",0
+QDLY		.DW	0	; quark delay factor
+WMOD		.DB	0	; delay mode, non-zero to use timer
+DCSAV		.DB	0	; for saving Z180 DCNTL value
+DMA		.DW	0	; Working DMA
+FILTYP		.DB	0	; Sound file type (TYPPT2, TYPPT3, TYPMYM)
+				
+TMP		.DB	0	; work around use of undocumented Z80
+				
+PORTS:	                        
+RSEL		.DB	0	; Register selection port
+RDAT		.DB	0	; Register data port
+		
+MSGBAN		.DB	"Tune Player for RomWBW v2.1, 11-Aug-2019",0
+MSGUSE		.DB	"Copyright (C) 2019, Wayne Warthen, GNU GPL v3",13,10
+		.DB	"PTxPlayer Copyright (C) 2004-2007 S.V.Bulba",13,10
+		.DB	"MYMPlay by Marq/Lieves!Tuore",13,10,13,10
+		.DB	"Usage: TUNE <filename>.[PT2|PT3|MYM]",0
+MSGBIO		.DB	"Incompatible BIOS or version, "
+		.DB	"HBIOS v", '0' + RMJ, ".", '0' + RMN, " required",0
+MSGHW		.DB	"Hardware error, sound chip not detected!",0
+MSGNAM		.DB	"Sound filename invalid (must be .PT2, .PT3, or .MYM)",0
+MSGFIL		.DB	"Sound file not found!",0
+MSGSIZ		.DB	"Sound file too large to load!",0
+MSGRCZ80	.DB	"RC2014 Z80 w/ Ed Brindley Sound Module",0
+MSGRCZ180	.DB	"RC2014 Z180 w/ Ed Brindley Sound Module",0
+MSGSC126	.DB	"SC126 Z180 w/ Ed Brindley Sound Module",0
+MSGEZ		.DB	"Easy Z80 w/ Ed Brindley Sound Module",0
+MSGN8		.DB	"RetroBrew N8 Onboard Sound System",0
+MSGSCG		.DB	"RetroBrew SCG ECB Adapter Sound System",0
+MSGTIM		.DB	", timer mode",0
+MSGDLY		.DB	", delay mode",0
+MSGPLY		.DB	"Playing...",0
+MSGEND		.DB	" Done",0
 ;
 ;===============================================================================
 ; PTx Player Routines
diff --git a/Source/Apps/XM/xmhb.180 b/Source/Apps/XM/xmhb.180
index 3033dc9e..b97886b5 100644
--- a/Source/Apps/XM/xmhb.180
+++ b/Source/Apps/XM/xmhb.180
@@ -135,6 +135,8 @@ MINIT1:
 	JR	Z,ARCINIT	; Handle RC2014 w/ Z180
 	CP	9		; Check for Easy Z80
 	JR	Z,RCINIT	; Treat same as RC2014 for now
+	CP	10		; Check for SC126 w/ Z180
+	JR	Z,ARCINIT	; Handle SC126 w/ Z180
 ;
 	; Check for Z180 which implies ASCI serial port
 	LD	DE,00202H	; D := 2, E := 2
@@ -152,6 +154,17 @@ MINIT2:
 	JR	MINIT3		; Complete the initialization
 ;
 RCINIT:
+	;; RC2014, use SIO
+	;; Suppress interrupts
+	;LD	A,01H		; WR1
+	;OUT	(S_CTLP),A	; Select WR1
+	;XOR	A		; No interrupts
+	;OUT	(S_CTLP),A	; Do it
+	;; Setup JP table
+	;LD	HL,SIO_JPTBL	; HBIOS jump table address
+	;LD	DE,SIO		; HBIOS console notification string
+	;JR	MINIT3		; Complete the initialization
+
 	; RC2014, use HBIOS calls
 	LD	HL,1250		; Smaller receive loop tiemout scalar
 	LD	(RCVSCL),HL	; ... to compensate for BIOS overhead
@@ -232,11 +245,12 @@ PLTID	DB	0		; Platform ID
 CPUSPD	DB	10		; CPU speed in MHz
 RCVSCL	DW	2800		; RECV loop timeout scalar
 ;
-RBC	DB	"RBC, 06-Jun-2018$"
+RBC	DB	"RBC, 11-Aug-2019$"
 ;
 UART	DB	", UART0$"
 ASCI	DB	", ASCI0$"
 ASCIRC	DB	", ASCI0 (RC2014)$"
+SIO	DB	", SIO$"
 COMX	DB	", COM0$"
 ;
 UBTAG	DB	" [UNA]$"
@@ -251,6 +265,15 @@ BIOERR	DB	13, 10, 13, 10, "++ Unknown BIOS ++", 13, 10, "$"
 ; Uninitialize modem
 ;
 UNINIT:
+	LD	A,(BIOID)
+	CP	1		; Is HBIOS?
+	RET	NZ		; If not, just return
+	
+	; Reset character device 0
+	LD	B,04H		; HBIOS CIOINIT function 0x04
+	LD	C,0		; Unit = 0
+	LD	DE,-1		; Reset w/ current settings
+	RST	08		; Do it
 	RET			; not initialized, so no 'UN-INITIALIZE'
 ;
 ;-----------------------------------------------------------------------
@@ -318,7 +341,7 @@ U_SENDR:
 ;
 ;-----------------------------------------------------------------------
 ;
-; Test and rep;ort carrier status, Z set if carrier present
+; Test and report carrier status, Z set if carrier present
 ;
 U_CAROK:
 	XOR	A		; not used, always indicate present
@@ -433,7 +456,7 @@ A_SENDR:
 ;
 ;-----------------------------------------------------------------------
 ;
-; Test and rep;ort carrier status, Z set if carrier present
+; Test and report carrier status, Z set if carrier present
 ;
 A_CAROK:
 	XOR	A		; not used, always indicate present
@@ -538,7 +561,7 @@ AR_SENDR:
 ;
 ;-----------------------------------------------------------------------
 ;
-; Test and rep;ort carrier status, Z set if carrier present
+; Test and report carrier status, Z set if carrier present
 ;
 AR_CAROK:
 	XOR	A		; not used, always indicate present
@@ -566,7 +589,7 @@ AR_RCVRDY:
 	AND	A_FRME | A_OVRE | A_PARE ; isolate line err bits
 	LD	B,A		; save err status in B
 	
-	; Z180 ASCI ports will stall if there are errors.
+	; Z8S180 Rev. N ASCI ports will stall if there are line errors.
 	; Error bits are NOT cleared by merely reading
 	; the status register.  Below, bit 3 of ASCI
 	; control register is written with a zero to 
@@ -605,6 +628,100 @@ AR_SPEED:
 ;=======================================================================
 ;=======================================================================
 ;
+; Standard RBC Projects SIO port @ 80H
+;
+;=======================================================================
+;=======================================================================
+;
+; SIO port constants
+;
+S_BASE	EQU	80H		; SIO base port
+S_DATP	EQU	S_BASE + 1	; data in port
+S_DATO	EQU	S_BASE + 1	; data out port
+S_CTLP	EQU	S_BASE + 0	; control/status port
+S_SNDB	EQU	04H		; bit to test for send ready
+S_SNDR	EQU	04H		; value when ready to send
+S_RCVB	EQU	01H		; bit to test for receive ready
+S_RCVR	EQU	01H		; value when ready to receive
+;
+; Following jump table is dynamically patched into real jump
+; table at program startup.  See MINIT above.  Note that only a
+; subset of the jump table is overlaid (SENDR to SPEED).
+;
+SIO_JPTBL:
+	JP	S_SENDR		; send character (via pop psw)
+	JP	S_CAROK		; test for carrier
+	JP	S_MDIN		; receive data byte
+	JP	S_GETCHR	; get character from modem
+	JP	S_RCVRDY	; check receive ready
+	JP	S_SNDRDY	; check send ready
+	JP	S_SPEED		; get speed value for file transfer time
+;
+;-----------------------------------------------------------------------
+;
+; Send character on top of stack
+;
+S_SENDR:
+	POP	AF		; get character to send from stack
+	OUT	(S_DATO),A	; send to port
+	RET
+;
+;-----------------------------------------------------------------------
+;
+; Test and report carrier status, Z set if carrier present
+;
+S_CAROK:
+	XOR	A		; not used, always indicate present
+	RET
+;
+;-----------------------------------------------------------------------
+;
+; Get a character (assume character ready has already been tested)
+;
+S_MDIN:
+S_GETCHR:
+	IN	A,(S_DATP)	; read character from port
+	RET
+;
+;-----------------------------------------------------------------------
+;
+; Test for character ready to receive, Z = ready
+; Error code returned in A register
+; *** Error code does not seem to be used ***
+;
+S_RCVRDY:
+	;XOR	A
+	;OUT	(S_CTLP),A	; select WR0
+	IN	A,(S_CTLP)	; get status
+	AND	S_RCVB		; isolate ready bit
+	CP	S_RCVR		; test it (set flags)
+	LD	A,0		; report no line errors
+	RET
+;
+;-----------------------------------------------------------------------
+;
+; Test for ready to send a character, Z = ready
+;
+S_SNDRDY:
+	;XOR	A
+	;OUT	(S_CTLP),A	; select WR0
+	IN	A,(S_CTLP)	; get status
+	AND	S_SNDB		; isolate ready bit
+	CP	S_SNDR		; test it (set flags)
+	LD	A,0		; report no line errors
+	RET
+;
+;-----------------------------------------------------------------------
+;
+; Report baud rate (index into SPTBL returned in register A)
+;
+S_SPEED:
+	LD	A,8		; arbitrarily return 9600 baud
+	RET
+;
+;=======================================================================
+;=======================================================================
+;
 ; HBIOS CONSOLE (COM0:)
 ;
 ; Will be used for all RC2014 systems
@@ -645,7 +762,7 @@ HB_SENDR:
 ;
 ;-----------------------------------------------------------------------
 ;
-; Test and rep;ort carrier status, Z set if carrier present
+; Test and report carrier status, Z set if carrier present
 ;
 HB_CAROK:
 	XOR	A		; not used, always indicate present
diff --git a/Source/CBIOS/ver.inc b/Source/CBIOS/ver.inc
index ac80a848..1b7b0393 100644
--- a/Source/CBIOS/ver.inc
+++ b/Source/CBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.3"
+#DEFINE BIOSVER	"2.9.2-pre.4"
diff --git a/Source/HBIOS/Build.ps1 b/Source/HBIOS/Build.ps1
index 8c413a9b..c6620821 100644
--- a/Source/HBIOS/Build.ps1
+++ b/Source/HBIOS/Build.ps1
@@ -19,17 +19,23 @@ param([string]$Platform = "", [string]$Config = "", [string]$RomSize = "512", [s
 # setup mechanism so that multiple configuration are not needed.  When building for UNA, the pre-built
 # UNA BIOS is simply imbedded, it is not built here.
 #
+$PlatformListZ80 = "SBC", "ZETA", "ZETA2", "RCZ80", "EZZ80", "UNA"
+$PlatformListZ180 = "N8", "MK4", "RCZ180", "SC126"
 
 #
 # Establish the build platform.  It may have been passed in on the command line.  Validate
 # $Platform and loop requesting a new value as long as it is not valid.  The valid platform
 # names are just hard-coded for now.
 #
+$PlatformList = $PlatformListZ80 + $PlatformListZ180
+$Prompt = "Platform ["
+ForEach ($PlatformName in $PlatformList) {$Prompt += $PlatformName + "|"}
+$Prompt = $Prompt.Substring(0, $Prompt.Length - 1) + "]"
 $Platform = $Platform.ToUpper()
 while ($true)
 {
-	if (($Platform -eq "SBC") -or ($Platform -eq "ZETA") -or ($Platform -eq "ZETA2") -or ($Platform -eq "RCZ80") -or ($Platform -eq "EZZ80") -or ($Platform -eq "RCZ180") -or ($Platform -eq "N8") -or ($Platform -eq "MK4") -or ($Platform -eq "UNA")) {break}
-	$Platform = (Read-Host -prompt "Platform [SBC|ZETA|ZETA2|RCZ80|EZZ80|RCZ180|N8|MK4|UNA]").Trim().ToUpper()
+	if ($PlatformList -contains $Platform) {break}
+	$Platform = (Read-Host -prompt $Prompt).Trim().ToUpper()
 }
 
 #
@@ -66,7 +72,8 @@ while ($true)
 # TASM should be invoked with the proper CPU type.  Below, the CPU type is inferred
 # from the platform.
 #
-if (($Platform -eq "N8") -or ($Platform -eq "MK4") -or ($Platform -eq "RCZ180")) {$CPUType = "180"} else {$CPUType = "80"}
+#if (($Platform -eq "N8") -or ($Platform -eq "MK4") -or ($Platform -eq "RCZ180") -or ($Platform -eq "SC126")) {$CPUType = "180"} else {$CPUType = "80"}
+if ($PlatformListZ180 -contains $Platform) {$CPUType = "180"} else {$CPUType = "80"}
 
 #
 # The $RomName variable determines the name of the image created by the script.  By default,
@@ -107,7 +114,7 @@ if ($Platform -eq "UNA") {$CBiosFile = '../CBIOS/cbios_una.bin'} else {$CBiosFil
 $RomApps = "assign","fdu","format","mode","osldr","rtc","survey","syscopy","sysgen","talk","timer","xm","inttest"
 
 ""
-"Building ${RomName}: ${ROMSize}KB ROM configuration ${Config} for Z${CPUType}..."
+"Building ${RomName} ${ROMSize}KB ROM configuration ${Config} for Z${CPUType}..."
 ""
 
 # Current date/time is queried here to be subsequently imbedded in image
@@ -146,7 +153,6 @@ Function Concat($InputFileList, $OutputFile)
 PLATFORM	.EQU		PLT_${Platform}		; HARDWARE PLATFORM
 ROMSIZE		.EQU		${ROMSize}		; SIZE OF ROM IN KB
 ;
-;#INCLUDE "${PlatformConfigFile}"
 #INCLUDE "${ConfigFile}"
 ;
 "@ | Out-File "build.inc" -Encoding ASCII
diff --git a/Source/HBIOS/Config/RCZ180_sc126.asm b/Source/HBIOS/Config/SC126_std.asm
similarity index 88%
rename from Source/HBIOS/Config/RCZ180_sc126.asm
rename to Source/HBIOS/Config/SC126_std.asm
index e87c811a..62740415 100644
--- a/Source/HBIOS/Config/RCZ180_sc126.asm
+++ b/Source/HBIOS/Config/SC126_std.asm
@@ -3,14 +3,12 @@
 ;   SC126
 ;==================================================================================================
 ;
-#include "cfg_rcz180.asm"
+#include "cfg_sc126.asm"
 ;
 Z180_CLKDIV	.SET	1		; 0=OSC/2, 1=OSC, 2=OSC*2
 Z180_MEMWAIT	.SET	0		; MEMORY WAIT STATES (0-3)
 Z180_IOWAIT	.SET	1		; ADD (0-3) I/O WAIT STATES ABOVE 1 W/S BUILT-IN
 ;
-DIAGPORT	.SET	$0D		; DIAGNOSTIC PORT ADDRESS
-;
 CPUOSC		.SET	18432000	; CPU OSC FREQ
 DEFSERCFG	.SET	SER_38400_8N1	; DEFAULT SERIAL LINE CONFIG
 ;
@@ -25,8 +23,6 @@ IDEENABLE	.SET	TRUE		; TRUE FOR IDE DEVICE SUPPORT (CF MODULE)
 IDEMODE		.SET	IDEMODE_RC	; TYPE OF CF MODULE: IDEMODE_RC, IDEMODE_SMB
 PPIDEENABLE	.SET	FALSE		; TRUE FOR PPIDE DEVICE SUPPORT (PPIDE MODULE)
 ;
-DSRTCENABLE	.SET	TRUE		; DS-1302 CLOCK DRIVER
-;
 SDENABLE	.SET	TRUE		; TRUE FOR SD SUPPORT
 SDMODE		.SET	SDMODE_SC126	; SDMODE_JUHA, SDMODE_CSIO, SDMODE_UART, SDMODE_PPI, SDMODE_DSD
 SDTRACE		.SET	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF IDEENABLE = TRUE)
diff --git a/Source/HBIOS/ay.asm b/Source/HBIOS/ay.asm
index fe245ef7..f2d36664 100644
--- a/Source/HBIOS/ay.asm
+++ b/Source/HBIOS/ay.asm
@@ -4,15 +4,28 @@
 ; WILL ALSO WORK WITH YM2149
 ;======================================================================
 ;
-#IF (PLATFORM == PLT_N8)
-AY_RSEL		.EQU	N8_PSG+0
-AY_RDAT		.EQU	N8_PSG+1
-AY_ACR		.EQU	N8_DEFACR
-#ELSE
+#IF (AYMODE == AYMODE_SCG)
 AY_RSEL		.EQU	$9A
 AY_RDAT		.EQU	$9B
 AY_ACR		.EQU	$9C
 #ENDIF
+;
+#IF (AYMODE == AYMODE_N8)
+AY_RSEL		.EQU	N8_PSG+0
+AY_RDAT		.EQU	N8_PSG+1
+AY_ACR		.EQU	N8_DEFACR
+#ENDIF
+;
+#IF (AYMODE == AYMODE_RCZ80)
+AY_RSEL		.EQU	$D8
+AY_RDAT		.EQU	$D0
+#ENDIF
+;
+#IF (AYMODE == AYMODE_RCZ180)
+AY_RSEL		.EQU	$68
+AY_RDAT		.EQU	$60
+#ENDIF
+;
 AY_R0CHAP	.EQU	$00
 AY_R1CHAP	.EQU	$01
 AY_R2CHBP	.EQU	$02
@@ -81,7 +94,7 @@ AY_BEEP:
 ; 
 AY_WRTPSG:
 	HB_DI
-#IF ((PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4) | (PLATFORM == PLT_RCZ180))
+#IF (CPUFAM == CPU_Z180)
 	IN0	A,(Z180_DCNTL)		; GET WAIT STATES
 	PUSH	AF			; SAVE VALUE
 	OR	%00110000		; FORCE SLOW OPERATION (I/O W/S=3)
@@ -91,7 +104,7 @@ AY_WRTPSG:
 	OUT	(AY_RSEL),A
 	LD	A,E
 	OUT	(AY_RDAT),A
-#IF ((PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4) | (PLATFORM == PLT_RCZ180))
+#IF (CPUFAM == CPU_Z180)
 	POP	AF			; GET SAVED DCNTL VALUE
 	OUT0	(Z180_DCNTL),A		; AND RESTORE IT
 #ENDIF
@@ -101,7 +114,9 @@ AY_WRTPSG:
 ; CHECK THERE IS A DEVICE PRESENT
 ;
 AY_PROBE:
+#IF ((AYMODE == AYMODE_SCG) | (AYMODE == AYMODE_N8))
 	LD	A,$FF
 	OUT	(AY_ACR),A		; INIT AUX CONTROL REG
+#ENDIF
 	XOR	A
 	RET
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 778e6ef5..11ff79af 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -57,6 +57,7 @@ VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_RCZ80	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index fac10b42..9e76a04d 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -38,10 +38,12 @@ VDUENABLE	.EQU	FALSE		; TRUE FOR VDU BOARD SUPPORT
 CVDUENABLE	.EQU	FALSE		; TRUE FOR CVDU BOARD SUPPORT
 NECENABLE	.EQU	FALSE		; TRUE FOR uPD7220 BOARD SUPPORT
 TMSENABLE	.EQU	FALSE		; TRUE FOR N8 (TMS9918) VIDEO/KBD SUPPORT
+TMSMODE		.EQU	TMSMODE_SCG	; TMSMODE_[SCG/N8]
 VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_SCG	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index ab683279..6bcf7679 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -38,10 +38,12 @@ VDUENABLE	.EQU	FALSE		; TRUE FOR VDU BOARD SUPPORT
 CVDUENABLE	.EQU	FALSE		; TRUE FOR CVDU BOARD SUPPORT
 NECENABLE	.EQU	FALSE		; TRUE FOR uPD7220 BOARD SUPPORT
 TMSENABLE	.EQU	TRUE		; TRUE FOR N8 (TMS9918) VIDEO/KBD SUPPORT
+TMSMODE		.EQU	TMSMODE_N8	; TMSMODE_[SCG/N8]
 VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	TRUE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_N8	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index f1a9129d..a6dab2a0 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -57,6 +57,7 @@ VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_RCZ180	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 00f84c8f..7310dd74 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -70,6 +70,7 @@ VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_RCZ80	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index f5e936dd..86af4aa1 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -49,11 +49,13 @@ VDUENABLE	.EQU	FALSE		; TRUE FOR VDU BOARD SUPPORT
 CVDUENABLE	.EQU	FALSE		; TRUE FOR CVDU BOARD SUPPORT
 NECENABLE	.EQU	FALSE		; TRUE FOR uPD7220 BOARD SUPPORT
 TMSENABLE	.EQU	FALSE		; TRUE FOR N8 (TMS9918) VIDEO/KBD SUPPORT
+TMSMODE		.EQU	TMSMODE_SCG	; TMSMODE_[SCG/N8]
 VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
 VDUSIZ		.EQU	V80X25		; VDU DISPLAY FORMAT V80X24, V80X25, V80X30
 ;
 SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
 AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_SCG	; AYMODE_[SCG/N8/RCZ80/RCZ180]
 ;
 MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
 MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
diff --git a/Source/HBIOS/cfg_sc126.asm b/Source/HBIOS/cfg_sc126.asm
new file mode 100644
index 00000000..a505da00
--- /dev/null
+++ b/Source/HBIOS/cfg_sc126.asm
@@ -0,0 +1,115 @@
+;
+;==================================================================================================
+;   ROMWBW 2.X CONFIGURATION DEFAULTS FOR SC126
+;==================================================================================================
+;
+; BUILD CONFIGURATION OPTIONS
+;
+CPUOSC		.EQU	18432000	; CPU OSC FREQ
+MEMMGR		.EQU	MM_Z180		; MM_NONE, MM_SBC, MM_Z2, MM_N8, MM_Z180
+RAMSIZE		.EQU	512		; SIZE OF RAM IN KB, MUST MATCH YOUR HARDWARE!!!
+DEFSERCFG	.EQU	SER_38400_8N1	; DEFAULT SERIAL LINE CONFIG (SHOULD MATCH ABOVE)
+INTMODE		.EQU	2		; 0=NONE, 1=INT MODE 1, 2=INT MODE 2
+DIAGENABLE	.EQU	TRUE		; TRUE FOR DIAGNOSTIC CODE PORT OUTPUT
+DIAGPORT	.EQU	$0D		; DIAGNOSTIC PORT ADDRESS
+;
+CRTACT		.EQU	FALSE		; CRT ACTIVATION AT STARTUP
+VDAEMU		.EQU	EMUTYP_ANSI	; DEFAULT VDA EMULATION (EMUTYP_TTY, EMUTYP_ANSI, ...)
+;
+DSKYENABLE	.EQU	FALSE		; TRUE FOR DSKY SUPPORT (DO NOT COMBINE WITH PPIDE)
+;
+HTIMENABLE	.EQU	FALSE		; TRUE FOR SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; SIMH CLOCK DRIVER
+DSRTCENABLE	.EQU	TRUE		; DS-1302 CLOCK DRIVER
+DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTCMODE_STD, DSRTCMODE_MFPIC
+DSRTCCHG	.EQU	FALSE		; DS-1302 CONFIGURE CHARGE ON (TRUE) OR OFF (FALSE)
+;
+ASCIENABLE	.EQU	TRUE		; TRUE FOR Z180 ASCI SUPPORT
+UARTENABLE	.EQU	FALSE		; TRUE FOR UART SUPPORT (ALMOST ALWAYS WANT THIS TO BE TRUE)
+UARTOSC		.EQU	1843200		; UART OSC FREQUENCY
+ACIAENABLE	.EQU	FALSE		; TRUE FOR MOTOROLA 6850 ACIA SUPPORT
+;
+SIOENABLE	.EQU	TRUE		; TRUE FOR ZILOG SIO SUPPORT
+SIODEBUG	.EQU	FALSE		; PS
+SIOCNT		.EQU	2		; 1 OR 2 SIO CHIPS (EACH CHIP HAS 2 CHANNELS)
+SIO0MODE	.EQU	SIOMODE_RC	; TYPE OF FIRST SIO TO DETECT: SIOMODE_RC/SMB/ZP/EZZ80
+SIO0BASE	.EQU	$80		; IO PORT ADDRESS BASE FOR FIRST SIO CHIP
+SIO0ACLK	.EQU	7372800		; 2457600/4915200=ZP,7372800=RC/SMB - SIO FIXED OSC FREQUENCY
+SIO0ADIV	.EQU	1		; 1=RC2014/SMB, 2/4/8/16/32/64/128/256=ZP depending on jumper X5
+SIO0ACFG	.EQU	SER_115200_8N1	; DEFAULT SERIAL LINE CONFIG
+SIO0BCLK	.EQU	7372800		; 2457600/4915200=ZP,7372800=RC/SMB - SIO FIXED OSC FREQUENCY
+SIO0BDIV	.EQU	1		; 1=RC2014/SMB, 2/4/8/16/32/64/128/256=ZP depending on jumper X5
+SIO0BCFG	.EQU	SER_115200_8N1	; DEFAULT SERIAL LINE CONFIG
+SIO1MODE	.EQU	SIOMODE_RC	; TYPE OF SECOND SIO TO DETECT: SIOMODE_RC, SIOMODE_SMB
+SIO1BASE	.EQU	$84		; IO PORT ADDRESS BASE FOR SECOND SIO CHIP
+SIO1ACLK	.EQU	7372800		; 2457600/4915200=ZP,7372800=RC/SMB - SIO FIXED OSC FREQUENCY
+SIO1ADIV	.EQU	1		; 1=RC2014/SMB, 2/4/8/16/32/64/128/256=ZP depending on jumper X5
+SIO1ACFG	.EQU	SER_115200_8N1	; DEFAULT SERIAL LINE CONFIG
+SIO1BCLK	.EQU	7372800		; 2457600/4915200=ZP,7372800=RC/SMB - SIO FIXED OSC FREQUENCY
+SIO1BDIV	.EQU	1		; 1=RC2014/SMB, 2/4/8/16/32/64/128/256=ZP depending on jumper X5
+SIO1BCFG	.EQU	SER_115200_8N1	; DEFAULT SERIAL LINE CONFIG
+;
+VDUENABLE	.EQU	FALSE		; TRUE FOR VDU BOARD SUPPORT
+CVDUENABLE	.EQU	FALSE		; TRUE FOR CVDU BOARD SUPPORT
+NECENABLE	.EQU	FALSE		; TRUE FOR uPD7220 BOARD SUPPORT
+TMSENABLE	.EQU	FALSE		; TRUE FOR N8 (TMS9918) VIDEO/KBD SUPPORT
+VGAENABLE	.EQU	FALSE		; TRUE FOR VGA VIDEO/KBD SUPPORT
+;
+SPKENABLE	.EQU	FALSE		; TRUE FOR RTC LATCH IOBIT SOUND
+AYENABLE	.EQU	FALSE		; TRUE FOR AY PSG SOUND
+AYMODE		.EQU	AYMODE_RCZ180	; AYMODE_[SCG/N8/RCZ80/RCZ180]
+;
+MDENABLE	.EQU	TRUE		; TRUE FOR ROM/RAM DISK SUPPORT (ALMOST ALWAYS WANT THIS ENABLED)
+MDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF MDENABLE = TRUE)
+;
+FDENABLE	.EQU	FALSE		; TRUE FOR FLOPPY SUPPORT
+FDMODE		.EQU	FDMODE_RCWDC	; FDMODE_DIO, FDMODE_ZETA, FDMODE_DIDE, FDMODE_N8, FDMODE_DIO3
+FDTRACE		.EQU	1		; 0=SILENT, 1=FATAL ERRORS, 2=ALL ERRORS, 3=EVERYTHING (ONLY RELEVANT IF FDENABLE = TRUE)
+FDMEDIA		.EQU	FDM144		; FDM720, FDM144, FDM360, FDM120 (ONLY RELEVANT IF FDENABLE = TRUE)
+FDMEDIAALT	.EQU	FDM720		; ALTERNATE MEDIA TO TRY, SAME CHOICES AS ABOVE (ONLY RELEVANT IF FDMAUTO = TRUE)
+FDMAUTO		.EQU	TRUE		; SELECT BETWEEN MEDIA OPTS ABOVE AUTOMATICALLY
+;
+RFENABLE	.EQU	FALSE		; TRUE FOR RAM FLOPPY SUPPORT
+;
+IDEENABLE	.EQU	FALSE		; TRUE FOR IDE SUPPORT
+IDEMODE		.EQU	IDEMODE_RC	; IDEMODE_DIO, IDEMODE_DIDE, IDEMODE_RC
+IDETRACE	.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF IDEENABLE = TRUE)
+IDE8BIT		.EQU	TRUE		; USE IDE 8BIT TRANSFERS (PROBABLY ONLY WORKS FOR CF CARDS!)
+;
+PPIDEENABLE	.EQU	FALSE		; TRUE FOR PPIDE SUPPORT (DO NOT COMBINE WITH DSKYENABLE)
+PPIDEMODE	.EQU	PPIDEMODE_RC	; PPIDEMODE_SBC, PPPIDEMODE_DIO3, PPIDEMODE_MFP, PPIDEMODE_N8, PPIDEMODE_RC
+PPIDETRACE	.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF PPIDEENABLE = TRUE)
+PPIDE8BIT	.EQU	FALSE		; USE IDE 8BIT TRANSFERS (PROBABLY ONLY WORKS FOR CF CARDS!)
+;
+SDENABLE	.EQU	TRUE		; TRUE FOR SD SUPPORT
+SDMODE		.EQU	SDMODE_SC126	; SDMODE_JUHA, SDMODE_CSIO, SDMODE_UART, SDMODE_PPI, SDMODE_DSD
+SDTRACE		.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF IDEENABLE = TRUE)
+SDCSIOFAST	.EQU	FALSE		; TABLE-DRIVEN BIT INVERTER
+;
+PRPENABLE	.EQU	FALSE		; TRUE FOR PROPIO SUPPORT
+;
+PPPENABLE	.EQU	FALSE		; TRUE FOR PARPORTPROP SUPPORT
+PPPSDENABLE	.EQU	TRUE		; TRUE FOR PARPORTPROP SD SUPPORT
+PPPSDTRACE	.EQU	1		; 0=SILENT, 1=ERRORS, 2=EVERYTHING (ONLY RELEVANT IF PPPENABLE = TRUE)
+PPPCONENABLE	.EQU	TRUE		; TRUE FOR PROPIO CONSOLE SUPPORT (PS/2 KBD & VGA VIDEO)
+;
+HDSKENABLE	.EQU	FALSE		; TRUE FOR SIMH HDSK SUPPORT
+;
+TERMENABLE	.EQU	FALSE		; TERM PSEUDO DEVICE, WILL BE ENABLED IF A VDA IS ENABLED
+;
+BOOTTYPE	.EQU	BT_MENU		; BT_MENU (WAIT FOR KEYPRESS), BT_AUTO (BOOT_DEFAULT AFTER BOOT_TIMEOUT SECS)
+BOOT_TIMEOUT	.EQU	20		; APPROX TIMEOUT IN SECONDS FOR AUTOBOOT, 0 FOR IMMEDIATE
+BOOT_DEFAULT	.EQU	'Z'		; SELECTION TO INVOKE AT TIMEOUT
+;
+; 18.432MHz OSC @ FULL SPEED
+;
+Z180_CLKDIV	.EQU	1		; 0=OSC/2, 1=OSC, 2=OSC*2
+Z180_MEMWAIT	.EQU	0		; MEMORY WAIT STATES (0-3)
+Z180_IOWAIT	.EQU	1		; ADD (0-3) I/O WAIT STATES ABOVE 1 W/S BUILT-IN
+;
+PIO_4P		.EQU	FALSE		; TRUE FOR ECB-4PIO PIO SUPPORT
+PIO_ZP		.EQU	FALSE		; TRUE FOR ECB-ZILOG PERIPHERALS BOARD
+PPI_SBC		.EQU	FALSE		; TRUE FOR SBC V2 8255 (IF NOT BEING USED FOR PPIDE)
+;
+UFENABLE	.EQU	FALSE		; TRUE FOR ECB USB-FIFO SUPPORT
+
diff --git a/Source/HBIOS/dbgmon.asm b/Source/HBIOS/dbgmon.asm
index 5cb20df0..a75898e7 100644
--- a/Source/HBIOS/dbgmon.asm
+++ b/Source/HBIOS/dbgmon.asm
@@ -111,15 +111,18 @@ SERIALCMDLOOP:
 ;_____________________________________________________________________________
 ;
 INITIALIZE:
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	; INSTALL UNA INVOCATION VECTOR FOR RST 08
 	LD	A,$C3		; JP INSTRUCTION
 	LD	(8),A		; STORE AT 0x0008
 	LD	HL,($FFFE)	; UNA ENTRY VECTOR
 	LD	(9),HL		; STORE AT 0x0009
-#ELSE
+#ENDIF
+
+#IF (BIOS == BIOS_WBW)
 	CALL	DELAY_INIT
 #ENDIF
+
 	RET
 ;
 ;__BOOT_______________________________________________________________________
@@ -128,7 +131,7 @@ INITIALIZE:
 ;_____________________________________________________________________________
 ;
 BOOT:
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	LD	BC,$01FB		; UNA FUNC = SET BANK
 	LD	DE,0			; ROM BANK 0
 	CALL	$FFFD			; DO IT (RST 08 NOT SAFE HERE)
@@ -737,7 +740,7 @@ PRTSTRH:
 	LD	HL,TXT_MINIHELP
 	JP	PRTSTR
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;
 ;__COUT_______________________________________________________________________
 ;
diff --git a/Source/HBIOS/dsrtc.asm b/Source/HBIOS/dsrtc.asm
index 62471b4b..e91c9093 100644
--- a/Source/HBIOS/dsrtc.asm
+++ b/Source/HBIOS/dsrtc.asm
@@ -71,7 +71,7 @@
 ; D4 WR	RTC_CE  RTC_CE  --	RTC_CE  RTC_CE  RTC_CE  
 ; D3 WR	NC      SPK     /RTC_CE	NC      NC      /SPI_CS2      
 ; D2 WR	NC      CLKHI   RTC_CLK	SPI_CS	SPI_CS	/SPI_CS1 
-; D1 WR	--      --	RTC_WE	SPI_CLK	NC	FS 
+; D1 WR	--      --	RTC_WE	SPI_CLK	NC	FS
 ; D0 WR	--	--	RTC_OUT	SPI_DI	NC	I2C_SCL    
 ;                       
 ; D7 RD	--	--	--	--	--	I2C_SDA	 
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index f175ff3e..40611d94 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -743,7 +743,7 @@ HB_START:
 ;
 	LD	SP,HBX_LOC		; SETUP INITIAL STACK JUST BELOW HBIOS PROXY
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	; SET BASE FOR CPU IO REGISTERS
 	LD	A,Z180_BASE
 	OUT0	(Z180_ICR),A
@@ -947,7 +947,7 @@ HB_START1:				; BNKCALL ARRIVES HERE, BUT NOW RUNNING IN RAM BANK
 ;
 	LD	HL,0		; L = 0 MEANS Z80
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 ;
 	; TEST FOR ORIGINAL Z180 USING MLT
 	LD	DE,$0506	; 5 X 6
@@ -980,7 +980,7 @@ HB_CPU1:
 ;
 	CALL	HB_CPUSPD		; CPU SPEED DETECTION
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 ;
 	; SET DESIRED WAIT STATES
 	LD	A,0 + (Z180_MEMWAIT << 6) | (Z180_IOWAIT << 4)
@@ -1141,7 +1141,7 @@ PSCNX	.EQU	$ + 1
 	LD	A,HBX_IVT >> 8		; SETUP HI BYTE OF IVT ADDRESS
 	LD	I,A			; ... AND PLACE IT IN I REGISTER
 
-  #IFDEF CPU_Z180
+  #IF (CPUFAM == CPU_Z180)
 	; SETUP Z180 IVT
 	XOR	A			; SETUP LO BYTE OF IVT ADDRESS
 	OUT0	(Z180_IL),A		; ... AND PLACE IN Z180 IL REGISTER
@@ -1282,7 +1282,7 @@ PSCNX	.EQU	$ + 1
 ;
 #ENDIF
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 ;
   #IF (INTMODE == 2)
 ;
@@ -1354,7 +1354,7 @@ HB_PCPU:
 	CALL	PRTD3M			; PRINT AS DECIMAL WITH 3 DIGIT MANTISSA
 	PRTS("MHz$")
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	PRTS(" IO=0x$")
 	LD	A,Z180_BASE
 	CALL	PRTHEXBYTE
@@ -1363,7 +1363,7 @@ HB_PCPU:
 ; DISPLAY CPU CONFIG
 ;
 	CALL	NEWLINE
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	LD	A,Z180_MEMWAIT
 #ELSE
 	LD	A,0
@@ -1371,7 +1371,7 @@ HB_PCPU:
 	CALL	PRTDECB
 	CALL	PRTSTRD
 	.TEXT	" MEM W/S, $"
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	LD	A,Z180_IOWAIT + 1
 #ELSE
 	LD	A,1
@@ -2356,7 +2356,7 @@ TEMPCNT	.DB	250
 ;
 HB_TIMINT2:
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	; ACK/RESET Z180 TIMER INTERRUPT
 	IN0	A,(Z180_TCR)
 	IN0	A,(Z180_TMDR0L)
@@ -2841,7 +2841,7 @@ HB_CPUSPD:
 	RET	NZ
 ;
 HB_CPUSPD1:
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	; USE MEM W/S = 2 AND I/O W/S = 3 FOR TEST
 	IN0	A,(Z180_DCNTL)
 	PUSH	AF
@@ -2858,7 +2858,7 @@ HB_CPUSPD1:
 	LD	(HB_CURSEC),A		; SAVE NEW VALUE
 	CALL	HB_WAITSEC		; WAIT FOR SECONDS TICK
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	; RESTORE W/S SETTINGS FROM BEFORE TEST
 	POP	AF
 	OUT0	(Z180_DCNTL),A
@@ -2893,7 +2893,7 @@ HB_WAITSEC:
 	LD	DE,0			; INIT LOOP COUNTER
 HB_WAITSEC1:
 ;
-#IFDEF CPU_Z80
+#IF (CPUFAM == CPU_Z80)
 	; LOOP TARGET IS 4000 T-STATES, SO CPU FREQ IN KHZ = LOOP COUNT * 4
 	CALL	DLY32
 	CALL	DLY16
@@ -2904,7 +2904,7 @@ HB_WAITSEC1:
 	INC	HL			; 6 TSTATES
 #ENDIF
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 	; LOOP TARGET IS 4000 T-STATES, SO CPU FREQ IN KHZ = LOOP COUNT * 4
 	CALL	DLY2
 	ADD	IX,BC			; 10 + 4 = 14 TSTATES
diff --git a/Source/HBIOS/plt_ezz80.inc b/Source/HBIOS/plt_ezz80.inc
index 34ca83ce..357fc580 100644
--- a/Source/HBIOS/plt_ezz80.inc
+++ b/Source/HBIOS/plt_ezz80.inc
@@ -1,6 +1,8 @@
 ;
 ; EASY Z80 HARDWARE DEFINITIONS
 ;
+#DEFINE		PLATFORM_NAME	"EASYZ80"
+;
 MPGSEL_0	.EQU	$78	; BANK_0 PAGE SELECT REGISTER (WRITE ONLY)
 MPGSEL_1	.EQU	$79	; BANK_1 PAGE SELECT REGISTER (WRITE ONLY)
 MPGSEL_2	.EQU	$7A	; BANK_2 PAGE SELECT REGISTER (WRITE ONLY)
diff --git a/Source/HBIOS/plt_mk4.inc b/Source/HBIOS/plt_mk4.inc
index 7e921886..9c398c95 100644
--- a/Source/HBIOS/plt_mk4.inc
+++ b/Source/HBIOS/plt_mk4.inc
@@ -1,6 +1,8 @@
 ;
 ; MARK IV HARDWARE DEFINITIONS
 ;
+#DEFINE 	PLATFORM_NAME	"MARK IV"
+;
 RAMBIAS		.EQU	512		; RAM STARTS AT 512K
 ;
 MK4_BASE	.EQU	$80		; I/O BASE ADDRESS FOR ONBOARD PERIPHERALS
diff --git a/Source/HBIOS/plt_n8.inc b/Source/HBIOS/plt_n8.inc
index 5ef0961d..18790b4c 100644
--- a/Source/HBIOS/plt_n8.inc
+++ b/Source/HBIOS/plt_n8.inc
@@ -1,6 +1,8 @@
 ;
 ; N8 HARDWARE DEFINITIONS
 ;
+#DEFINE 	PLATFORM_NAME	"N8"
+;
 RAMBIAS		.EQU	0		; RAM STARTS AT 0K
 ;
 N8_BASE		.EQU	$80		; I/O BASE ADDRESS FOR ONBOARD PERIPHERALS
diff --git a/Source/HBIOS/plt_rcz180.inc b/Source/HBIOS/plt_rcz180.inc
index 03ba4bfd..d1f2e488 100644
--- a/Source/HBIOS/plt_rcz180.inc
+++ b/Source/HBIOS/plt_rcz180.inc
@@ -1,6 +1,8 @@
 ;
 ; RC2014 Z180 HARDWARE DEFINITIONS
 ;
+#DEFINE		PLATFORM_NAME	"RC2014"
+;
 RAMBIAS		.EQU	512		; RAM STARTS AT 512K
 ;
 MPGSEL_0	.EQU	$78		; BANK_0 PAGE SELECT REGISTER (WRITE ONLY)
diff --git a/Source/HBIOS/plt_rcz80.inc b/Source/HBIOS/plt_rcz80.inc
index b9b1764e..2a83a991 100644
--- a/Source/HBIOS/plt_rcz80.inc
+++ b/Source/HBIOS/plt_rcz80.inc
@@ -1,6 +1,8 @@
 ;
 ; RC2014 HARDWARE DEFINITIONS
 ;
+#DEFINE		PLATFORM_NAME	"RC2014"
+;
 MPGSEL_0	.EQU	$78	; BANK_0 PAGE SELECT REGISTER (WRITE ONLY)
 MPGSEL_1	.EQU	$79	; BANK_1 PAGE SELECT REGISTER (WRITE ONLY)
 MPGSEL_2	.EQU	$7A	; BANK_2 PAGE SELECT REGISTER (WRITE ONLY)
diff --git a/Source/HBIOS/plt_sbc.inc b/Source/HBIOS/plt_sbc.inc
index ed472aae..22fb1f11 100644
--- a/Source/HBIOS/plt_sbc.inc
+++ b/Source/HBIOS/plt_sbc.inc
@@ -1,6 +1,8 @@
 ;
 ; SBC HARDWARE DEFINITIONS
 ;
+#DEFINE 	PLATFORM_NAME	"SBC"
+;
 SBC_BASE	.EQU	$60		; I/O BASE ADDRESS FOR ONBOARD PERIPHERALS
 ;
 #IF ((PLATFORM == PLT_SBC) | (PLATFORM == PLT_ZETA))
diff --git a/Source/HBIOS/plt_sc126.inc b/Source/HBIOS/plt_sc126.inc
new file mode 100644
index 00000000..4f63903b
--- /dev/null
+++ b/Source/HBIOS/plt_sc126.inc
@@ -0,0 +1,12 @@
+;
+; SC126 Z180 HARDWARE DEFINITIONS
+;
+#DEFINE		PLATFORM_NAME	"SC126"
+;
+RAMBIAS		.EQU	512		; RAM STARTS AT 512K
+;	
+RTC		.EQU	$0C		; ADDRESS OF RTC LATCH AND INPUT PORT
+;
+Z180_BASE	.EQU	$C0		; I/O BASE ADDRESS FOR INTERNAL Z180 REGISTERS
+;
+#INCLUDE "z180.inc"
diff --git a/Source/HBIOS/plt_una.inc b/Source/HBIOS/plt_una.inc
index 71fe5208..827a36ca 100644
--- a/Source/HBIOS/plt_una.inc
+++ b/Source/HBIOS/plt_una.inc
@@ -1,3 +1,4 @@
 ;
 ; UNA HARDWARE DEFINITIONS
 ;
+#DEFINE		PLATFORM_NAME	"UNA"
\ No newline at end of file
diff --git a/Source/HBIOS/plt_zeta.inc b/Source/HBIOS/plt_zeta.inc
index 5ba12e42..0c13a45a 100644
--- a/Source/HBIOS/plt_zeta.inc
+++ b/Source/HBIOS/plt_zeta.inc
@@ -1,6 +1,9 @@
 ;
 ; ZETA HARDWARE DEFINITIONS
 ;
+;
+#DEFINE		PLATFORM_NAME	"ZETA"
+;
 SBC_BASE	.EQU	$60		; I/O BASE ADDRESS FOR ONBOARD PERIPHERALS
 ;
 ; BIT 7 OF MPCL_ROM SELECTS ROM/RAM (0=ROM, 1=RAM)
diff --git a/Source/HBIOS/plt_zeta2.inc b/Source/HBIOS/plt_zeta2.inc
index c3603ee5..f1026150 100644
--- a/Source/HBIOS/plt_zeta2.inc
+++ b/Source/HBIOS/plt_zeta2.inc
@@ -1,6 +1,8 @@
 ;
 ; ZETA 2 HARDWARE DEFINITIONS
 ;
+#DEFINE 	PLATFORM_NAME	"ZETA V2"
+;
 SBC_BASE	.EQU	$60		; I/O BASE ADDRESS FOR ONBOARD PERIPHERALS
 ;
 MPGSEL_0	.EQU	SBC_BASE + $18	; BANK_0 PAGE SELECT REGISTER (WRITE ONLY)
diff --git a/Source/HBIOS/romldr.asm b/Source/HBIOS/romldr.asm
index 8ed0b30d..43bb6033 100644
--- a/Source/HBIOS/romldr.asm
+++ b/Source/HBIOS/romldr.asm
@@ -45,7 +45,7 @@ BID_CUR	.EQU	-1	; SPECIAL BANK ID VALUE INDICATES CURRENT BANK
 ;
 	JP	$100			; RST 0: JUMP TO BOOT CODE
 	.FILL	(008H - $),0FFH
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	JP	$FFFD			; RST 8: INVOKE UBIOS FUNCTION
 #ELSE
 	JP	HB_INVOKE		; RST 8: INVOKE HBIOS FUNCTION
@@ -61,7 +61,7 @@ BID_CUR	.EQU	-1	; SPECIAL BANK ID VALUE INDICATES CURRENT BANK
 	.FILL	(030H - $),0FFH
 	RET				; RST 30
 	.FILL	(038H - $),0FFH
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	RETI				; RETURN W/ INTS DISABLED
 #ELSE
   #IF (INTMODE == 1)
@@ -92,11 +92,11 @@ BID_CUR	.EQU	-1	; SPECIAL BANK ID VALUE INDICATES CURRENT BANK
 ;
 START:	LD	SP,BL_STACK	; SETUP STACK
 ;
-#IF (PLATFORM != PLT_UNA)
+#IF (BIOS == BIOS_WBW)
 	CALL	DELAY_INIT	; INIT DELAY FUNCTIONS
 #ENDIF
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;	; COPY UNA BIOS PAGE ZERO TO USER BANK, LEAVE USER BANK ACTIVE
 ;	LD	BC,$01FB	; UNA FUNC = SET BANK
 ;	LD	DE,BID_BIOS	; UBIOS_PAGE (SEE PAGES.INC)
@@ -334,7 +334,7 @@ MATX:
 MENU_S:	MENU_L("~Monitor$ ", "M", KY_CL, MON_SERIAL,  1000h,  MON_LOC,   MON_SIZ,  BID_CUR,     BID_USR, "Monitor$     ")
 MENU_1:	MENU_L("~CP/M$    ", "C", KY_BK, CPM_ENT,     2000h,  CPM_LOC,   CPM_SIZ,  BID_CUR,     BID_USR, "CP/M 80 v2.2$")
 	MENU_L("~Z-System$", "Z", KY_FW, CPM_ENT,     5000h,  CPM_LOC,   CPM_SIZ,  BID_CUR,     BID_USR, "ZSDOS v1.1$  ")
-#IF (PLATFORM != PLT_UNA)
+#IF (BIOS == BIOS_WBW)
 	MENU_L("~Forth$   ", "F", KY_EX, FTH_LOC,     0000h,  FTH_LOC,   FTH_SIZ,  BID_IMG1,    BID_USR, "Camel Forth$ ")
 	MENU_L("~BASIC$   ", "B", KY_DE, BAS_LOC,     1700h,  BAS_LOC,   BAS_SIZ,  BID_IMG1,    BID_USR, "Nascom BASIC$")
 	MENU_L("~T-BASIC$ ", "T", KY_EN, TBC_LOC,     3700h,  TBC_LOC,   TBC_SIZ,  BID_IMG1,    BID_USR, "Tasty BASIC$ ")
@@ -396,7 +396,7 @@ GOROM1:	LD	E,(HL)			; (1) EXEC ADR
 	PUSH	DE			; (5) SRC/DEST BANKS
 	DJNZ	GOROM1			; LOOP TILL DONE
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;
 ; NOTE: UNA HAS NO INTERBANK MEMORY COPY, SO WE CAN ONLY LOAD
 ; IMAGES FROM THE CURRENT BANK.  A SIMPLE LDIR IS USED TO
@@ -487,7 +487,7 @@ GOBOOTDISK:
 	LD	DE,STR_BOOTDISK1	; DISK BOOT MESSAGE
 	CALL	WRITESTR		; PRINT IT
 ;	
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	LD	A,(BL_BOOTID)		; GET BOOT DEVICE ID
 	LD	B,A			; MOVE TO B
 ;
@@ -594,7 +594,7 @@ GOBOOTDISK:
 	RRCA				; ... BY DIVIDING MSB BY TWO
 	LD	(BL_COUNT),A		; ... AND SAVE IT
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;
 	; READ OS IMAGE INTO MEMORY
 	LD	C,$42			; UNA FUNC: READ SECTORS
@@ -676,7 +676,7 @@ DB_ERR:
 	LD	DE,STR_BOOTERR
 	JP	MENU
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;
 ; PRINT LIST OF ALL DRIVES UNDER UNA
 ;
@@ -886,7 +886,7 @@ MSG_GO		.DB	$DB,$9D,$00,$00,$00,$80,$80,$80	; "Go...   "
 ; CONSOLE CHARACTER I/O HELPER ROUTINES (REGISTERS PRESERVED)
 ;==================================================================================================
 ;
-#IF (PLATFORM != PLT_UNA)
+#IF (BIOS == BIOS_WBW)
 ;
 ; OUTPUT CHARACTER FROM A
 ;
@@ -951,7 +951,7 @@ CST:
 ;
 #ENDIF
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 ;
 ; OUTPUT CHARACTER FROM A
 ;
diff --git a/Source/HBIOS/sd.asm b/Source/HBIOS/sd.asm
index f9fe2500..26a69365 100644
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@@ -197,7 +197,7 @@ SD_TRDR		.EQU	Z180_TRDR
 #IF (SDMODE == SDMODE_SC126)		; SC126
 SD_DEVCNT	.EQU	1		; NUMBER OF PHYSICAL UNITS (SOCKETS)
 SD_OPRREG	.EQU	RTC		; USES RTC LATCHES FOR OPERATION
-SD_OPRDEF	.EQU	%00001100	; QUIESCENT STATE (DEASSERT /CS1 & /CS2)
+SD_OPRDEF	.EQU	%00001100	; QUIESCENT STATE (/CS1 & /CS2 DEASSERTED)
 SD_CS		.EQU	%00000100	; RTC:2 IS SELECT FOR PRIMARY SPI CARD
 SD_CNTR		.EQU	Z180_CNTR
 SD_TRDR		.EQU	Z180_TRDR
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 257704d6..6665ab36 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -12,6 +12,7 @@
 ; 7. RCZ80	RC2014 based system with 512K banked RAM/ROM card
 ; 8. RCZ180	RC2014 based system with Z180 CPU
 ; 9. EZZ80	Easy Z80, Z80 SBC w/ RC2014 bus and CTC
+; 10. SC126	SC126 Z180 based system
 
 ; All the classes require certain generic definitions, and these are
 ; defined here prior to the inclusion of platform specific .inc files.
@@ -46,11 +47,25 @@ PLT_UNA		.EQU	6		; UNA BIOS
 PLT_RCZ80	.EQU	7		; RC2014 W Z80
 PLT_RCZ180	.EQU	8		; RC2014 W/ Z180
 PLT_EZZ80	.EQU	9		; EASY Z80
+PLT_SC126	.EQU	10		; SC126
 ;
-#IF (PLATFORM != PLT_UNA)
+#IF (BIOS == BIOS_WBW)
 #INCLUDE "hbios.inc"
 #ENDIF
 ;
+; CPU TYPES
+;
+CPU_NONE	.EQU	0		; NO CPU TYPE DEFINED
+CPU_Z80		.EQU	1		; Z80 FAMILY
+CPU_Z180	.EQU	2		; Z180 FAMILY
+CPU_Z280	.EQU	3		; Z280 FAMILY
+;
+; BIOS MODE
+;
+BIOS_NONE	.EQU	0		; NO BIOS TYPE DEFINED
+BIOS_WBW	.EQU	1		; ROMWBW HBIOS
+BIOS_UNA	.EQU	2		; UNA UBIOS
+;
 ; MEMORY MANAGERS
 ;
 MM_NONE		.EQU	0
@@ -153,6 +168,20 @@ SDMODE_DSD	.EQU	6		; DUAL SD
 SDMODE_MK4	.EQU	7		; MARK IV
 SDMODE_SC126	.EQU	8		; SC126
 ;
+; SOUND CHIP MODE SELECTIONS
+;
+AYMODE_NONE	.EQU	0
+AYMODE_N8	.EQU	1		; N8 BUILT-IN SOUND
+AYMODE_SCG	.EQU	2		; SCG ECB BOARD
+AYMODE_RCZ80	.EQU	3		; RC2014 SOUND MODULE BY ED BRINDLEY ON Z80
+AYMODE_RCZ180	.EQU	4		; RC2014 SOUND MODULE BY ED BRINDLEY ON Z180
+;
+; TMS VIDEO MODE SELECTIONS
+;
+TMSMODE_NONE	.EQU	0
+TMSMODE_SCG	.EQU	1		; SCG ECB BOARD
+TMSMODE_N8	.EQU	2		; N8 BUILT-IN VIDEO
+;
 ; SERIAL DEVICE CONFIGURATION CONSTANTS
 ;
 SER_DATA5	.EQU	0 << 0
@@ -264,40 +293,16 @@ FORCECON	.EQU	0	; DEFAULT IS TO FOLLOW NORMAL SEQUENCE
 ;
 #INCLUDE "build.inc"			; INCLUDE USER CONFIG, ADD VARIANT, TIMESTAMP, & ROMSIZE
 ;
-#IF ((PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4) | (PLATFORM == PLT_RCZ180))
-#DEFINE CPU_Z180
+#IF ((PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4) | (PLATFORM == PLT_RCZ180) | (PLATFORM == PLT_SC126))
+CPUFAM	.EQU	CPU_Z180
 #ELSE
-#DEFINE CPU_Z80
+CPUFAM	.EQU	CPU_Z80
 #ENDIF
 ;
-; SET PLATFORM NAME STRING
-;
-#IF (PLATFORM == PLT_SBC)
-  #DEFINE 	PLATFORM_NAME	"SBC"
-#ENDIF
-#IF (PLATFORM == PLT_ZETA)
-  #DEFINE 	PLATFORM_NAME	"ZETA"
-#ENDIF
-#IF (PLATFORM == PLT_ZETA2)
-  #DEFINE 	PLATFORM_NAME	"ZETA V2"
-#ENDIF
-#IF (PLATFORM == PLT_N8)
-  #DEFINE 	PLATFORM_NAME	"N8"
-#ENDIF
-#IF (PLATFORM == PLT_MK4)
-  #DEFINE 	PLATFORM_NAME	"MARK IV"
-#ENDIF
 #IF (PLATFORM == PLT_UNA)
-  #DEFINE	PLATFORM_NAME	"UNA"
-#ENDIF
-#IF (PLATFORM == PLT_RCZ80)
-  #DEFINE	PLATFORM_NAME	"RC2014"
-#ENDIF
-#IF (PLATFORM == PLT_RCZ180)
-  #DEFINE	PLATFORM_NAME	"RC2014"
-#ENDIF
-#IF (PLATFORM == PLT_EZZ80)
-  #DEFINE	PLATFORM_NAME	"EASY"
+BIOS	.EQU	BIOS_UNA
+#ELSE
+BIOS	.EQU	BIOS_WBW
 #ENDIF
 ;
 ; INCLUDE PLATFORM SPECIFIC HARDWARE DEFINITIONS
@@ -338,11 +343,15 @@ FORCECON	.EQU	0	; DEFAULT IS TO FOLLOW NORMAL SEQUENCE
 #INCLUDE "plt_ezz80.inc"
 #ENDIF
 ;
+#IF (PLATFORM == PLT_SC126)
+#INCLUDE "plt_sc126.inc"
+#ENDIF
+;
 ; SETUP DEFAULT CPU SPEED VALUES
 ;
 CPUKHZ	.EQU	CPUOSC / 1000	; CPU FREQ IN KHZ
 ;
-#IFDEF CPU_Z180
+#IF (CPUFAM == CPU_Z180)
 #IF (Z180_CLKDIV == 0)
 CPUKHZ	.SET	CPUKHZ / 2	; ADJUST FOR HALF SPEED OPERATION
 #ENDIF
@@ -355,10 +364,12 @@ CPUMHZ	.EQU	CPUKHZ / 1000	; CPU FREQ IN MHZ
 ;
 ; MEMORY BANK CONFIGURATION
 ;
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 BID_ROM0	.EQU	$0000
 BID_RAM0	.EQU	$8000
-#ELSE
+#ENDIF
+;
+#IF (BIOS == BIOS_WBW)
 BID_ROM0	.EQU	$00
 BID_RAM0	.EQU	$80
 #ENDIF
@@ -437,7 +448,7 @@ MON_SERIAL	.EQU	MON_LOC + (1 * 3)	; MONITOR ENTRY (SERIAL PORT)
 ;
 #IF (INTMODE == 2)
 
-  #IFDEF CPU_Z180
+  #IF (CPUFAM == CPU_Z180)
 
 ; Z180-BASED SYSTEMS
 
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 49d317b7..9b494150 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -14,7 +14,7 @@
 ; TMS DRIVER - CONSTANTS
 ;======================================================================
 ;
-#IF (PLATFORM == PLT_N8)
+#IF (TMSMODE == TMSMODE_N8)
 
 TMS_DATREG	.EQU	N8_BASE + $18	; READ/WRITE DATA
 TMS_CMDREG	.EQU	N8_BASE + $19	; READ STATUS / WRITE REG SEL
@@ -24,7 +24,9 @@ TMS_PPIB	.EQU	N8_BASE + $05	; PPI PORT B
 TMS_PPIC	.EQU	N8_BASE + $06	; PPI PORT C
 TMS_PPIX	.EQU	N8_BASE + $07	; PPI CONTROL PORT
 
-#ELSE
+#ENDIF
+
+#IF (TMSMODE == TMSMODE_SCG)
 
 TMS_DATREG	.EQU	$98		; READ/WRITE DATA
 TMS_CMDREG	.EQU	$99		; READ STATUS / WRITE REG SEL
@@ -45,7 +47,7 @@ TERMENABLE	.SET	TRUE		; INCLUDE TERMINAL PSEUDODEVICE DRIVER
 ; TMS_IODELAY IS USED TO ADD RECOVERY TIME TO TMS9918 ACCESSES
 ; IF YOU SEE SCREEN CORRUPTION, ADJUST THIS!!!
 ;
-#IF (PLATFORM == PLT_N8)
+#IF (TMSMODE == TMSMODE_N8)
 ; BELOW WAS TUNED FOR N8 AT 18MHZ WITH 3 IO WAIT STATES
 #DEFINE		TMS_IODELAY	NOP \ NOP \ NOP \ NOP \ NOP \ NOP \ NOP \ NOP
 #ELSE
@@ -58,14 +60,12 @@ TERMENABLE	.SET	TRUE		; INCLUDE TERMINAL PSEUDODEVICE DRIVER
 ;======================================================================
 ;
 TMS_INIT:
-#IF (PLATFORM != PLT_N8)
+#IF (TMSMODE == TMSMODE_SCG)
 	LD	A,$FF
 	OUT	(TMS_ACR),A		; INIT AUX CONTROL REG
 #ENDIF
 ;
-#IF (PLATFORM == PLT_N8)
 	LD	IY,TMS_IDAT		; POINTER TO INSTANCE DATA
-#ENDIF
 ;
 	CALL	NEWLINE			; FORMATTING
 	PRTS("TMS: IO=0x$")
@@ -83,7 +83,7 @@ TMS_INIT1:
 	CALL 	TMS_CRTINIT		; SETUP THE TMS CHIP REGISTERS
 	CALL	TMS_LOADFONT		; LOAD FONT DATA FROM ROM TO TMS STRORAGE
 	CALL	TMS_VDARES
-#IF (PLATFORM == PLT_N8)
+#IF (TMSMODE == TMSMODE_N8)
 	CALL	PPK_INIT		; INITIALIZE KEYBOARD DRIVER
 #ENDIF
 ;
@@ -118,7 +118,7 @@ TMS_FNTBL:
 	.DW	TMS_VDAFIL
 	.DW	TMS_VDACPY
 	.DW	TMS_VDASCR
-#IF (PLATFORM == PLT_N8)
+#IF (TMSMODE == TMSMODE_N8)
 	.DW	PPK_STAT
 	.DW	PPK_FLUSH
 	.DW	PPK_READ
@@ -238,8 +238,6 @@ TMS_VDASCR2:
 	XOR	A
 	RET
 
-#IF (PLATFORM != PLT_N8)
-
 ; DUMMY FUNCTIONS BELOW BECAUSE SCG BOARD HAS NO
 ; KEYBOARD INTERFACE
 
@@ -255,8 +253,6 @@ TMS_READ:
 	LD	E,26		; RETURN <SUB> (CTRL-Z)
 	XOR	A		; SIGNAL SUCCESS
 	RET
-
-#ENDIF
 ;
 ;======================================================================
 ; TMS DRIVER - PRIVATE DRIVER FUNCTIONS
diff --git a/Source/HBIOS/uart.asm b/Source/HBIOS/uart.asm
index 863ab52a..6e810690 100644
--- a/Source/HBIOS/uart.asm
+++ b/Source/HBIOS/uart.asm
@@ -569,7 +569,6 @@ UART_DEV		.DB	0		; DEVICE NUM USED DURING INIT
 ; UART PORT TABLE
 ;
 UART_CFG:
-;#IF ((PLATFORM == PLT_SBC) | (PLATFORM == PLT_ZETA) | (PLATFORM == PLT_ZETA2))
 #IF (UARTSBC)
 	; SBC/ZETA ONBOARD SERIAL PORT
 	.DB	0				; DEVICE NUMBER (UPDATED DURING INIT)
@@ -579,7 +578,6 @@ UART_CFG:
 	.DW	DEFSERCFG			; LINE CONFIGURATION
 	.FILL	2,$FF				; FILLER
 #ENDIF
-;#IF (PLATFORM == PLT_SBC) | (PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4))
 #IF (UARTCAS)
 	; CASSETTE INTERFACE SERIAL PORT
 	.DB	0				; DEVICE NUMBER (UPDATED DURING INIT)
@@ -589,7 +587,6 @@ UART_CFG:
 	.DW	SER_300_8N1			; LINE CONFIGURATION
 	.FILL	2,$FF				; FILLER
 #ENDIF
-;#IF (PLATFORM == PLT_SBC)
 #IF (UARTMFP)
 	; MF/PIC SERIAL PORT
 	.DB	0				; DEVICE NUMBER (UPDATED DURING INIT)
@@ -599,7 +596,6 @@ UART_CFG:
 	.DW	DEFSERCFG			; LINE CONFIGURATION
 	.FILL	2,$FF				; FILLER
 #ENDIF
-;#IF (PLATFORM == PLT_SBC) | (PLATFORM == PLT_N8) | (PLATFORM == PLT_MK4))
 #IF (UART4)
 	; 4UART SERIAL PORT A
 	.DB	0				; DEVICE NUMBER (UPDATED DURING INIT)
diff --git a/Source/HBIOS/util.asm b/Source/HBIOS/util.asm
index 1051a77d..ad14ef6e 100644
--- a/Source/HBIOS/util.asm
+++ b/Source/HBIOS/util.asm
@@ -517,7 +517,7 @@ BYTE2BCD1:
 	POP	BC
 	RET
 
-#IF (PLATFORM != PLT_UNA)
+#IF (BIOS == BIOS_WBW)
 
 #IFDEF USEDELAY
 
@@ -543,7 +543,7 @@ DELAY:				; 17TS (FROM INVOKING CALL)	|
 DELAY1:				;				|
 	; --- LOOP = ((CPUSCL * 16) - 5) TS ------------+	|
 	DEC	A		; 4TS			|	|
-#IFDEF CPU_Z180			;			|	|
+#IF (CPUFAM == CPU_Z180)	;			|	|
 	OR	A		; +4TS FOR Z180		|	|
 #ENDIF				;			|	|
 	JR	NZ,DELAY1	; 12TS (NZ) / 7TS (Z)	|	|
@@ -574,7 +574,7 @@ VDELAY:				; 17TS (FROM INVOKING CALL)		|
 ;								|	|
 VDELAY1:			;				|	|
 	; --- INNER LOOP = ((CPUSCL * 16) - 5) TS ------+	|	|
-#IFDEF CPU_Z180			;			|	|	|
+#IF (CPUFAM == CPU_Z180)	;			|	|	|
 	OR	A		; +4TS FOR Z180		|	|	|
 #ENDIF				;			|	|	|
 	DEC	A		; 4TS			|	|	|
@@ -582,7 +582,7 @@ VDELAY1:			;				|	|
 	; ----------------------------------------------+	|	|
 ;								|	|
 	DEC	DE		; 6TS				|	|
-#IFDEF CPU_Z180			;				|	|
+#IF (CPUFAM == CPU_Z180)	;				|	|
 	OR	A		; +4TS FOR Z180			|	|
 #ENDIF				;				|	|
 	LD	A,D		; 4TS				|	|
@@ -610,7 +610,7 @@ LDELAY:
 ; CPU SCALER := MAX(1, (PHIMHZ - 2))
 ;
 DELAY_INIT:
-#IF (PLATFORM == PLT_UNA)
+#IF (BIOS == BIOS_UNA)
 	LD	C,$F8			; UNA BIOS GET PHI FUNCTION
 	RST	08			; RETURNS SPEED IN HZ IN DE:HL
 	LD	B,4			; DIVIDE MHZ IN DE:HL BY 100000H 
diff --git a/Source/HBIOS/ver.inc b/Source/HBIOS/ver.inc
index ac80a848..1b7b0393 100644
--- a/Source/HBIOS/ver.inc
+++ b/Source/HBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.3"
+#DEFINE BIOSVER	"2.9.2-pre.4"