diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 7a3861a1..2afffb6e 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -60,6 +60,8 @@ Version 3.1.1
 - D?T: Substantial update to TastyBasic incuding a .COM executable
 - PMS: Added VGM audio file player
 - WBW: ZPMLDR and ZPM3 fixes, credit to Lars Nelson for finding ZPM3 source!
+- DDW: Add support for MBC sound card
+- WBW: Add support for "romless" booting
 
 Version 3.1
 -----------
diff --git a/Source/HBIOS/Build.cmd b/Source/HBIOS/Build.cmd
index 43e777cd..04dad21d 100644
--- a/Source/HBIOS/Build.cmd
+++ b/Source/HBIOS/Build.cmd
@@ -93,8 +93,10 @@ copy /b romldr.bin + dbgmon.bin + ..\zsdos\zsys_wbw.bin osimg_small.bin || exit
 :: should yield a result of zero.
 ::
 
-for %%f in (hbios_rom.bin osimg.bin osimg1.bin osimg2.bin) do (
-  "%TOOLS%\srecord\srec_cat.exe" %%f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o %%f -Binary || exit /b
+if %ROMSize% gtr 0 (
+    for %%f in (hbios_rom.bin osimg.bin osimg1.bin osimg2.bin) do (
+      "%TOOLS%\srecord\srec_cat.exe" %%f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o %%f -Binary || exit /b
+    )
 )
 
 ::
@@ -113,17 +115,23 @@ for %%f in (hbios_rom.bin osimg.bin osimg1.bin osimg2.bin) do (
 :: HBIOS on the fly for testing purposes.
 ::
 
-copy /b hbios_rom.bin + osimg.bin + osimg1.bin + osimg2.bin + ..\RomDsk\rom%ROMSize%_wbw.dat %ROMName%.rom || exit /b
-copy /b hbios_rom.bin + osimg.bin + osimg1.bin + osimg2.bin %ROMName%.upd || exit /b
-copy /b hbios_app.bin + osimg_small.bin %ROMName%.com || exit /b
+if %ROMSize% gtr 0 (
+    copy /b hbios_rom.bin + osimg.bin + osimg1.bin + osimg2.bin + ..\RomDsk\rom%ROMSize%_wbw.dat %ROMName%.rom || exit /b
+    copy /b hbios_rom.bin + osimg.bin + osimg1.bin + osimg2.bin %ROMName%.upd || exit /b
+    copy /b hbios_app.bin + osimg_small.bin %ROMName%.com || exit /b
+) else (
+    copy /b hbios_rom.bin + osimg_small.bin %ROMName%.rom || exit /b
+    copy /b hbios_rom.bin + osimg_small.bin %ROMName%.upd || exit /b
+    copy /b hbios_app.bin + osimg_small.bin %ROMName%.com || exit /b
+)
 
 ::
 :: Copy results to output directory
 ::
 
-copy %ROMName%.rom ..\..\Binary || exit /b
-copy %ROMName%.upd ..\..\Binary || exit /b
-copy %ROMName%.com ..\..\Binary || exit /b
+if exist %ROMName%.rom copy %ROMName%.rom ..\..\Binary || exit /b
+if exist %ROMName%.upd copy %ROMName%.upd ..\..\Binary || exit /b
+if exist %ROMName%.com copy %ROMName%.com ..\..\Binary || exit /b
 
 goto :eof
 
@@ -188,6 +196,7 @@ call Build RCZ80 kio 512 || exit /b
 call Build RCZ80 mt 512 || exit /b
 call Build RCZ80 duart 512 || exit /b
 call Build RCZ80 zrc 512 || exit /b
+call Build RCZ80 zrc_ram 0 || exit /b
 call Build RCZ180 ext 512 || exit /b
 call Build RCZ180 nat 512 || exit /b
 call Build RCZ280 ext 512 || exit /b
diff --git a/Source/HBIOS/Build.ps1 b/Source/HBIOS/Build.ps1
index e6b62fec..a5606716 100644
--- a/Source/HBIOS/Build.ps1
+++ b/Source/HBIOS/Build.ps1
@@ -76,8 +76,8 @@ while ($true)
 
 while ($true)
 {
-	if (($RomSize -eq 128) -or ($RomSize -eq 256) -or ($RomSize -eq 512) -or ($RomSize -eq 1024)) {break}
-	$RomSize = (Read-Host -prompt "ROM Size [128|256|512|1024]").Trim()
+	if (($RomSize -eq 0) -or ($RomSize -eq 128) -or ($RomSize -eq 256) -or ($RomSize -eq 512) -or ($RomSize -eq 1024)) {break}
+	$RomSize = (Read-Host -prompt "ROM Size [0|128|256|512|1024]").Trim()
 }
 
 #
diff --git a/Source/HBIOS/Build.sh b/Source/HBIOS/Build.sh
index cc4d5304..818b45fa 100755
--- a/Source/HBIOS/Build.sh
+++ b/Source/HBIOS/Build.sh
@@ -26,6 +26,7 @@ if [ "${ROM_PLATFORM}" == "dist" ] ; then
 	ROM_PLATFORM="RCZ80"; ROM_CONFIG="std"; ROMSIZE="512"; bash Build.sh
 	ROM_PLATFORM="RCZ80"; ROM_CONFIG="skz"; ROMSIZE="512"; bash Build.sh
 	ROM_PLATFORM="RCZ80"; ROM_CONFIG="zrc"; ROMSIZE="512"; bash Build.sh
+	ROM_PLATFORM="RCZ80"; ROM_CONFIG="zrc_ram"; ROMSIZE="0"; bash Build.sh
 	ROM_PLATFORM="SBC"; ROM_CONFIG="std"; ROMSIZE="512"; bash Build.sh
 	ROM_PLATFORM="SBC"; ROM_CONFIG="simh"; ROMSIZE="512"; bash Build.sh
 	ROM_PLATFORM="MBC"; ROM_CONFIG="std"; ROMSIZE="512"; bash Build.sh
@@ -71,7 +72,7 @@ if [ -z "${ROMSIZE}" ] ; then
 	ROMSIZE="512"
 fi
 
-while [ ! '(' "${ROMSIZE}" = 1024 -o "${ROMSIZE}" = 512 -o "${ROMSIZE}" = 256 -o "${ROMSIZE}" = 128 ')' ] ; do
+while [ ! '(' "${ROMSIZE}" = 1024 -o "${ROMSIZE}" = 512 -o "${ROMSIZE}" = 256 -o "${ROMSIZE}" = 128 -o "${ROMSIZE}" = 0 ')' ] ; do
 	echo -n "Romsize :"
 	read ROMSIZE
 done
diff --git a/Source/HBIOS/Config/RCZ80_zrc_ram.asm b/Source/HBIOS/Config/RCZ80_zrc_ram.asm
new file mode 100644
index 00000000..cd68248d
--- /dev/null
+++ b/Source/HBIOS/Config/RCZ80_zrc_ram.asm
@@ -0,0 +1,54 @@
+;
+;==================================================================================================
+;   RC2014 Z80 ZRC CONFIGURATION
+;==================================================================================================
+;
+; THE COMPLETE SET OF DEFAULT CONFIGURATION SETTINGS FOR THIS PLATFORM ARE FOUND IN THE
+; CFG_<PLT>.ASM INCLUDED FILE WHICH IS FOUND IN THE PARENT DIRECTORY.  THIS FILE CONTAINS
+; COMMON CONFIGURATION SETTINGS THAT OVERRIDE THE DEFAULTS.  IT IS INTENDED THAT YOU MAKE
+; YOUR CUSTOMIZATIONS IN THIS FILE AND JUST INHERIT ALL OTHER SETTINGS FROM THE DEFAULTS.
+; EVEN BETTER, YOU CAN MAKE A COPY OF THIS FILE WITH A NAME LIKE <PLT>_XXX.ASM AND SPECIFY
+; YOUR FILE IN THE BUILD PROCESS.
+;
+; THE SETTINGS BELOW ARE THE SETTINGS THAT ARE MOST COMMONLY MODIFIED FOR THIS PLATFORM.
+; MANY OF THEM ARE EQUAL TO THE SETTINGS IN THE INCLUDED FILE, SO THEY DON'T REALLY DO
+; ANYTHING AS IS.  THEY ARE LISTED HERE TO MAKE IT EASY FOR YOU TO ADJUST THE MOST COMMON
+; SETTINGS.
+;
+; N.B., SINCE THE SETTINGS BELOW ARE REDEFINING VALUES ALREADY SET IN THE INCLUDED FILE,
+; TASM INSISTS THAT YOU USE THE .SET OPERATOR AND NOT THE .EQU OPERATOR BELOW. ATTEMPTING
+; TO REDEFINE A VALUE WITH .EQU BELOW WILL CAUSE TASM ERRORS!
+;
+; PLEASE REFER TO THE CUSTOM BUILD INSTRUCTIONS (README.TXT) IN THE SOURCE DIRECTORY (TWO
+; DIRECTORIES ABOVE THIS ONE).
+;
+#DEFINE	BOOT_DEFAULT	"H"		; DEFAULT BOOT LOADER CMD ON <CR> OR AUTO BOOT
+;
+#include "cfg_rcz80.asm"
+;
+CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
+;
+CPUOSC		.SET	7372800		; CPU OSC FREQ IN MHZ
+;
+RAMSIZE		.SET	2048		; SIZE OF RAM IN KB (MUST MATCH YOUR HARDWARE!!!)
+MEMMGR		.SET	MM_ZRC		; MEMORY MANAGER: MM_[SBC|Z2|N8|Z180]
+;
+MDROM		.SET	FALSE		; MD: ENABLE ROM DISK
+;
+UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
+ACIAENABLE	.SET	TRUE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
+SIOENABLE	.SET	TRUE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
+;
+TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
+TMSTIMENABLE	.SET	FALSE		; TMS: ENABLE TIMER INTERRUPTS (REQUIRES IM1)
+;
+AY38910ENABLE	.SET	TRUE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
+;
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
+;
+IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
+;
+PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
+;
+PRPENABLE	.SET	FALSE		; PRP: ENABLE ECB PROPELLER IO BOARD DRIVER (PRP.ASM)
diff --git a/Source/HBIOS/Makefile b/Source/HBIOS/Makefile
index f1c5ef01..371f24d2 100644
--- a/Source/HBIOS/Makefile
+++ b/Source/HBIOS/Makefile
@@ -56,18 +56,26 @@ $(ROMNAME).rom $(ROMNAME).com $(ROMNAME).img &: $(ROMDEPS)
 	if [ $(ROM_PLATFORM) != UNA ] ; then \
 		cat camel80.bin nascom.bin tastybasic.bin game.bin eastaegg.bin netboot.mod updater.bin usrrom.bin >osimg1.bin ; \
 		cat imgpad2.bin >osimg2.bin ; \
-		for f in hbios_rom.bin osimg.bin osimg1.bin osimg2.bin ; do \
-			srec_cat $$f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o $$f -Binary ; \
-		done \
+		if [ $(ROMSIZE) -gt 0 ] ; then \
+			for f in hbios_rom.bin osimg.bin osimg1.bin osimg2.bin ; do \
+				srec_cat $$f -Binary -Crop 0 0x7FFF -Checksum_Negative_Big_Endian 0x7FFF 1 1 -o $$f -Binary ; \
+			done \
+		fi \
 	fi
 	if [ $(ROM_PLATFORM) = UNA ] ; then \
 		cp osimg.bin $(DEST)/UNA_WBW_SYS.bin ; \
 		cp ../RomDsk/rom$(ROMSIZE)_una.dat $(DEST)/UNA_WBW_ROM$(ROMSIZE).bin ; \
 		cat ../UBIOS/UNA-BIOS.BIN osimg.bin ../UBIOS/FSFAT.BIN ../RomDsk/rom$(ROMSIZE)_una.dat >$(ROMNAME).rom ; \
 	else \
-		cat hbios_rom.bin osimg.bin osimg1.bin osimg2.bin ../RomDsk/rom$(ROMSIZE)_wbw.dat >$(ROMNAME).rom ; \
-		cat hbios_rom.bin osimg.bin osimg1.bin osimg2.bin >$(ROMNAME).upd ; \
-		cat hbios_app.bin osimg_small.bin > $(ROMNAME).com ; \
+		if [ $(ROMSIZE) -gt 0 ] ; then \
+			cat hbios_rom.bin osimg.bin osimg1.bin osimg2.bin ../RomDsk/rom$(ROMSIZE)_wbw.dat >$(ROMNAME).rom ; \
+			cat hbios_rom.bin osimg.bin osimg1.bin osimg2.bin >$(ROMNAME).upd ; \
+			cat hbios_app.bin osimg_small.bin > $(ROMNAME).com ; \
+		else \
+			cat hbios_rom.bin osimg_small.bin > $(ROMNAME).rom ; \
+			cat hbios_rom.bin osimg_small.bin > $(ROMNAME).upd ; \
+			cat hbios_app.bin osimg_small.bin > $(ROMNAME).com ; \
+		fi \
 	fi
 
 prereq: $(FONTS) camel80.bin tastybasic.bin
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index abb3ae04..24cdd573 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -513,7 +513,7 @@ HBX_BNKSEL1:
 	BIT	7,A			; BIT 7 SET REQUESTS RAM PAGE
 	JR	Z,HBX_ROM		; NOT SET, SELECT ROM PAGE
 	RES	7,A			; RAM PAGE REQUESTED: CLEAR ROM BIT
-	ADD	A,$10			; ADD 16 x 32K - RAM STARTS FROM 512K
+	ADD	A,ROMSIZE / 32		; STARTING RAM BANK NUMBER OFFSET
 ;
 HBX_ROM:
 	OUT	($1F),A			; HCS WRITE TO THE BANK CONTROL REGISTER
@@ -1530,16 +1530,30 @@ MBC_SINGLE:
 ;
 #ENDIF
 ;
-; IF THIS IS NOT A ROMBOOT, THEN WE NEED TO COPY THE "APP" BANK TO
+; IF THIS IS A ROM-LESS SYSTEM, THEN WE NEED TO COPY THE "APP" BANK TO
 ; TPA.  IT IS DONE PRIOR TO COPYING HBIOS TO IT'S FINAL BANK BECAUSE
 ; THE SOURCE OF THE APP BANK CODE MAY BE THE BANK THAT HBIOS WANTS TO
 ; USE AS IT'S FINAL LOCATION (PRIMARILY IN CASE OF RAMBOOT WHERE THE
 ; SYSTEM HAS THE MINIMUM 128KB OF RAM).
 ;
-
-
-
-
+#IFDEF ROMBOOT
+  #IF (ROMSIZE == 0)
+	LD	A,(HB_CURBNK)
+	LD	(HB_SRCBNK),A
+	LD	A,BID_USR
+	LD	(HB_DSTBNK),A
+	LD	HL,HB_END
+	LD	DE,0
+	LD	BC,$8000
+    #IF (MEMMGR == MM_Z280)
+	CALL	Z280_BNKCPY
+    #ELSE
+	CALL	HBX_BNKCPY
+    #ENDIF
+;
+  #ENDIF
+;
+#ENDIF
 ;
 ; IF ALREADY EXECUTING IN RAM, BYPASS RAM BANK INSTALLATION
 ;
@@ -2450,6 +2464,7 @@ HB_Z280BUS1:
 #ENDIF
 ;
 #IFDEF ROMBOOT
+  #IF (ROMSIZE > 0)
 ;
 ; ROM CHECKSUM VERIFICATION
 ; EACH OF THE FIRST 4 ROM BANKS HAS A CHECKSUM INJECTED SUCH THAT
@@ -2520,6 +2535,7 @@ HB_CKBNKSIZ	.EQU	$-HB_CKBNK	; SIZE OF ROUTINE
 ;
 HB_ROMCKZ:
 ;
+  #ENDIF
 #ENDIF
 ;
 ; LOW BATTERY DIAGNOSTIC MESSAGE
@@ -2723,15 +2739,8 @@ INITSYS4:
 	LDCTL	(C),HL
 #ENDIF
 ;
-; CHAIN TO OS LOADER
+#IFNDEF ROMBOOT
 ;
-#IFDEF ROMBOOT
-	; PERFORM BANK CALL TO OS IMAGES BANK IN ROM
-	LD	A,BID_IMG0		; CHAIN TO OS IMAGES BANK
-	LD	IX,0			; ENTER AT ADDRESS 0
-	CALL	HBX_BNKCALL		; GO THERE
-	HALT				; WE SHOULD NEVER COME BACK!
-#ELSE
 	; COPY OS IMAGE: BID_USR:<IMG START> --> BID_USR:0
 	LD	B,BF_SYSSETCPY		; HBIOS FUNC: SETUP BANK COPY
 	LD	D,BID_USR		; D = DEST BANK = USER BANK
@@ -2745,16 +2754,23 @@ INITSYS4:
 	LD	DE,0			; TO USER ADDRESS 0
 	RST	08			; DO IT
 ;
-	; PERFORM BANK CALL TO USER BANK
-	LD	A,BID_USR		; CHAIN TO OS IMAGES BANK
+#ENDIF
+;
+; CHAIN TO LOADER
+;
+#IFDEF ROMBOOT
+  #IF (ROMSIZE > 0)
+	LD	A,BID_IMG0		; CHAIN TO OS IMAGES BANK
+  #ELSE
+	LD	A,BID_USR		; CHAIN TO USER BANK
+  #ENDIF
+#ELSE
+	LD	A,BID_USR		; CHAIN TO USER BANK
+#ENDIF
 	LD	IX,0			; ENTER AT ADDRESS 0
 	CALL	HBX_BNKCALL		; GO THERE
 	HALT				; WE SHOULD NEVER COME BACK!
 ;
-#ENDIF
-;
-	RET
-;
 ;	CALL A LIST OF ROUTINES POINTED TO BY DE OF LENGTH B.
 ;
 CALLLIST:
@@ -7025,7 +7041,9 @@ SLACK		.EQU	BNKTOP - $
 		.ECHO	" bytes.\n"
 ;
 #IFDEF ROMBOOT
+  #IF (ROMSIZE > 0)
 		.FILL	SLACK
+  #ENDIF
 #ENDIF
 ;
 		.END
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 3c5b330d..aa9b12b4 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -529,6 +529,10 @@ BID_IMG2	.EQU	BID_ROM0 + 3	; NETWORK BOOT				-+ ROM BANKS
 BID_ROMD0	.EQU	BID_ROM0 + 4	; FIRST ROM DRIVE BANK			 |  ROM
 BID_ROMDN	.EQU	BID_ROMN	; LAST ROM DRIVE BANK			 V  DRIVE
 ;
+#IF (ROMSIZE == 0)
+BID_BOOT	.SET	BID_RAM0	; SPECIAL CASE ROM-LESS SYSTEM
+#ENDIF
+;
 #IF (BIOS == BIOS_WBW)
 ;
   #IF (!MDRAM)
diff --git a/Source/ZRC/Build.cmd b/Source/ZRC/Build.cmd
index d303209d..99b9b522 100644
--- a/Source/ZRC/Build.cmd
+++ b/Source/ZRC/Build.cmd
@@ -1,8 +1,38 @@
 @echo off
 setlocal
 
-if not exist ..\..\Binary\RCZ80_zrc.rom goto :eof
+set TOOLS=../../Tools
 
-copy /b zrc_cfldr.bin + zrc_ptbl.bin + zrc_fill_1.bin + zrc_mon.bin + zrc_fill_2.bin + ..\..\Binary\RCZ80_zrc.rom + zrc_fill_3.bin ..\..\Binary\hd1024_zrc_prefix.dat || exit /b
+set PATH=%TOOLS%\srecord;%PATH%
 
-copy /b ..\..\Binary\hd1024_zrc_prefix.dat + ..\..\Binary\hd1024_cpm22.img + ..\..\Binary\hd1024_zsdos.img + ..\..\Binary\hd1024_nzcom.img + ..\..\Binary\hd1024_cpm3.img + ..\..\Binary\hd1024_zpm3.img + ..\..\Binary\hd1024_ws4.img ..\..\Binary\hd1024_zrc_combo.img || exit /b
\ No newline at end of file
+if exist ..\..\Binary\RCZ80_zrc.rom call :build_zrc
+
+if exist ..\..\Binary\RCZ80_zrc_ram.rom call :build_zrc_ram
+
+goto :eof
+
+:build_zrc
+
+srec_cat -generate 0x0 0x100000 --constant 0x00 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x0 0x100 zrc_cfldr.bin -binary -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x100 0x200 zrc_ptbl.bin -binary -offset 0x100 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x1F000 0x20000 zrc_mon.bin -binary -offset 0x1F000 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x24000 0xA4000 ..\..\Binary\RCZ80_zrc.rom -binary -offset 0x24000 -o temp.dat -binary
+move temp.dat ..\..\Binary\hd1024_zrc_prefix.dat
+
+copy /b ..\..\Binary\hd1024_zrc_prefix.dat + ..\..\Binary\hd1024_cpm22.img + ..\..\Binary\hd1024_zsdos.img + ..\..\Binary\hd1024_nzcom.img + ..\..\Binary\hd1024_cpm3.img + ..\..\Binary\hd1024_zpm3.img + ..\..\Binary\hd1024_ws4.img ..\..\Binary\hd1024_zrc_combo.img || exit /b
+
+goto :eof
+
+:build_zrc_ram
+
+srec_cat -generate 0x0 0x100000 --constant 0x00 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x0 0x100 zrc_cfldr.bin -binary -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x100 0x200 zrc_ptbl.bin -binary -offset 0x100 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x1F000 0x20000 zrc_mon.bin -binary -offset 0x1F000 -o temp.dat -binary
+srec_cat temp.dat -binary -exclude 0x24000 0xA4000 ..\..\Binary\RCZ80_zrc_ram.rom -binary -offset 0x24000 -o temp.dat -binary
+move temp.dat ..\..\Binary\hd1024_zrc_ram_prefix.dat
+
+copy /b ..\..\Binary\hd1024_zrc_ram_prefix.dat + ..\..\Binary\hd1024_cpm22.img + ..\..\Binary\hd1024_zsdos.img + ..\..\Binary\hd1024_nzcom.img + ..\..\Binary\hd1024_cpm3.img + ..\..\Binary\hd1024_zpm3.img + ..\..\Binary\hd1024_ws4.img ..\..\Binary\hd1024_zrc_ram_combo.img || exit /b
+
+goto :eof
diff --git a/Source/ZRC/Makefile b/Source/ZRC/Makefile
index 3c582211..b2248ad1 100644
--- a/Source/ZRC/Makefile
+++ b/Source/ZRC/Makefile
@@ -1,6 +1,9 @@
 HD1024ZRCPREFIX = hd1024_zrc_prefix.dat
 HD1024ZRCCOMBOIMG = hd1024_zrc_combo.img
+HD1024ZRCRAMPREFIX = hd1024_zrc_ram_prefix.dat
+HD1024ZRCRAMCOMBOIMG = hd1024_zrc_ram_combo.img
 ZRCROM = ../../Binary/RCZ80_zrc.rom
+ZRCRAMROM = ../../Binary/RCZ80_zrc_ram.rom
 HD1024IMGS = ../../Binary/hd1024_cpm22.img ../../Binary/hd1024_zsdos.img ../../Binary/hd1024_nzcom.img \
 	../../Binary/hd1024_cpm3.img ../../Binary/hd1024_zpm3.img ../../Binary/hd1024_ws4.img
 
@@ -10,6 +13,10 @@ ifneq ($(wildcard $(ZRCROM)),)
 	OBJECTS += $(HD1024ZRCPREFIX) $(HD1024ZRCCOMBOIMG)
 endif
 
+ifneq ($(wildcard $(ZRCRAMROM)),)
+	OBJECTS += $(HD1024ZRCRAMPREFIX) $(HD1024ZRCRAMCOMBOIMG)
+endif
+
 DEST=../../Binary
 
 TOOLS = ../../Tools
@@ -19,7 +26,23 @@ include $(TOOLS)/Makefile.inc
 DIFFPATH = $(DIFFTO)/Binary
 
 $(HD1024ZRCPREFIX):
-	cat zrc_cfldr.bin zrc_ptbl.bin zrc_fill_1.bin zrc_mon.bin zrc_fill_2.bin $(ZRCROM) zrc_fill_3.bin >$@
+	srec_cat -generate 0x0 0x100000 --constant 0x00 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x0 0x100 zrc_cfldr.bin -binary -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x100 0x200 zrc_ptbl.bin -binary -offset 0x100 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x1F000 0x20000 zrc_mon.bin -binary -offset 0x1F000 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x24000 0xA4000 $(ZRCROM) -binary -offset 0x24000 -o temp.dat -binary
+	mv temp.dat $@
+
+$(HD1024ZRCRAMPREFIX):
+	srec_cat -generate 0x0 0x100000 --constant 0x00 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x0 0x100 zrc_cfldr.bin -binary -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x100 0x200 zrc_ptbl.bin -binary -offset 0x100 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x1F000 0x20000 zrc_mon.bin -binary -offset 0x1F000 -o temp.dat -binary
+	srec_cat temp.dat -binary -exclude 0x24000 0xA4000 $(ZRCRAMROM) -binary -offset 0x24000 -o temp.dat -binary
+	mv temp.dat $@
 
 $(HD1024ZRCCOMBOIMG): $(HD1024ZRCPREFIX) $(HD1024IMGS)
-	cat $^ > $@
\ No newline at end of file
+	cat $^ > $@
+
+$(HD1024ZRCRAMCOMBOIMG): $(HD1024ZRCRAMPREFIX) $(HD1024IMGS)
+	cat $^ > $@
diff --git a/Source/ZRC/zrc_fill_1.bin b/Source/ZRC/zrc_fill_1.bin
deleted file mode 100644
index 705bedcd..00000000
Binary files a/Source/ZRC/zrc_fill_1.bin and /dev/null differ
diff --git a/Source/ZRC/zrc_fill_2.bin b/Source/ZRC/zrc_fill_2.bin
deleted file mode 100644
index 294f4016..00000000
Binary files a/Source/ZRC/zrc_fill_2.bin and /dev/null differ
diff --git a/Source/ZRC/zrc_fill_3.bin b/Source/ZRC/zrc_fill_3.bin
deleted file mode 100644
index a461d083..00000000
Binary files a/Source/ZRC/zrc_fill_3.bin and /dev/null differ
diff --git a/Source/ver.inc b/Source/ver.inc
index 3b25aa3f..709318d5 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.160"
+#DEFINE BIOSVER	"3.1.1-pre.161"
diff --git a/Source/ver.lib b/Source/ver.lib
index 364713e9..dd51943f 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.160"
+	db	"3.1.1-pre.161"
 	endm