diff --git a/Source/HBIOS/Config/MBC_ddw.asm b/Source/HBIOS/Config/MBC_ddw.asm
new file mode 100644
index 00000000..9a628d19
--- /dev/null
+++ b/Source/HBIOS/Config/MBC_ddw.asm
@@ -0,0 +1,56 @@
+;
+;==================================================================================================
+;   MBC 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 PLATFORM_NAME "Multi Board Computer"
+#DEFINE	BOOT_DEFAULT	"H"		; DEFAULT BOOT LOADER CMD ON <CR> OR AUTO BOOT
+;
+#include "cfg_mbc.asm"
+;
+CPUOSC		.EQU	4000000		; CPU OSC FREQ IN MHZ
+;
+BATCOND		.SET	FALSE
+;
+PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
+;
+DSKYENABLE	.SET	TRUE		; ENABLES DSKY
+DSKYMODE	.SET	DSKYMODE_NG	; DSKY VERTSION: DSKYMODE_[V1|NG]
+DSKYOSC         .SET    100000
+;
+FDENABLE	.EQU	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+
+;DIAGLVL		.EQU	DL_VERBOSE
+
+DMAENABLE	.EQU	TRUE		; DMA: ENABLE DMA DRIVER (DMA.ASM)
+DMABASE		.EQU	$E0		; DMA: DMA BASE ADDRESS
+DMAMODE		.EQU	DMAMODE_MBC	; DMA: DMA MODE (NONE|ECB|Z180|Z280|RC|MBC)
+
+CVDUMODE .EQU CVDUMODE_MBC ; CVDU: CVDU MODE: CVDUMODE_[NONE|ECB|MBC]
+CVDUMON .EQU CVDUMON_CGA ; CVDU: CVDU MONITOR SETUP: CVDUMON_[NONE|CGA|EGA]
+
+INTMODE         .SET    2
+CTCENABLE       .SET    TRUE            ; ENABLE ZILOG CTC SUPPORT
+
+AY38910ENABLE	.EQU	TRUE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
+AY_CLK		.EQU	CPUOSC / 2	; DEFAULT TO CPUOSC / 4
+AYMODE		.EQU	AYMODE_MBC	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
\ No newline at end of file
diff --git a/Source/HBIOS/cen.asm b/Source/HBIOS/cen.asm
index 834fa8c6..8c4a5c9a 100644
--- a/Source/HBIOS/cen.asm
+++ b/Source/HBIOS/cen.asm
@@ -45,15 +45,15 @@ CEN_PREINIT:
 	XOR	A			; ZERO TO ACCUM
 	LD	(CEN_DEV),A		; CURRENT DEVICE NUMBER
 	LD	IY,CEN_CFG		; POINT TO START OF CFG TABLE
-CEN_PREINIT0:	
+CEN_PREINIT0:
 	PUSH	BC			; SAVE LOOP CONTROL
 	CALL	CEN_INITUNIT		; HAND OFF TO UNIT INIT CODE
 	POP	BC			; RESTORE LOOP CONTROL
-;	
+;
 	LD	A,(IY+1)		; GET THE CEN TYPE DETECTED
 	OR	A			; SET FLAGS
 	JR	Z,CEN_PREINIT2		; SKIP IT IF NOTHING FOUND
-;	 
+;
 	PUSH	BC			; SAVE LOOP CONTROL
 	PUSH	IY			; CFG ENTRY ADDRESS
 	POP	DE			; ... TO DE
@@ -95,7 +95,7 @@ CEN_INITUNIT:
 CEN_INIT:
 	LD	B,CEN_CFGCNT		; COUNT OF POSSIBLE CEN UNITS
 	LD	IY,CEN_CFG		; POINT TO START OF CFG TABLE
-CEN_INIT1:	
+CEN_INIT1:
 	PUSH	BC			; SAVE LOOP CONTROL
 	LD	A,(IY+1)		; GET CEN TYPE
 	OR	A			; SET FLAGS
@@ -137,6 +137,18 @@ CEN_OUT:
 	CALL	CEN_OST			; READY TO SEND?
 	JR	Z,CEN_OUT		; LOOP IF NOT
 	; *** ADD CODE TO OUTPUT BYTE ***
+	LD	A,(IY+3)
+	LD	C,A			; PORT 0 (DATA)
+ 	OUT	(C),E			; OUTPUT DATA TO PORT
+ 	call 	DELAY   		; ignore anything back after a reset
+        ld      A,%00001101             ; select & strobe, LEDS OFF
+	INC 	C 			; PUT CONTROL PORT IN C
+	INC 	C
+        OUT	(C),A			; OUTPUT DATA TO PORT
+  	call 	DELAY   		; ignore anything back after a reset
+        ld      A,%00001100             ; select, LEDS OFF
+        OUT	(C),A			; OUTPUT DATA TO PORT
+
 	XOR	A			; SIGNAL SUCCESS
 	RET
 ;
@@ -150,8 +162,11 @@ CEN_IST:
 ; OUTPUT STATUS
 ;
 CEN_OST:
-	; *** ADD CODE TO CHECK FOR OUTPUT READY ***
-	OR	A			; SET FLAGS
+	LD	A,(IY+3)
+	LD	C,A			; PORT 0 (DATA)
+	INC 	C			; SELECT STATUS PORT
+ 	IN	A,(C)			; GET STATUS INFO
+    	AND	%10000000		; ONLY INTERESTED IN BUSY FLAG
 	RET				; DONE
 ;
 ; INITIALIZE DEVICE
@@ -166,14 +181,16 @@ CEN_INITDEV:
 ; PREINIT ABOVE.  PREINIT IS NOT ALLOWED TO ENABLE INTS!
 ;
 CEN_INITDEVX:
-	; *** NOT SURE THIS IS RIGHT ***
 	LD	A,(IY+3)
 	LD	C,A			; PORT 0 (DATA)
 	XOR	A			; CLEAR ACCUM
 	OUT	(C),A			; SEND IT
 	INC	C			; BUMP TO
 	INC	C			; ... PORT 2
-	LD	A,%11000000		; RESET, LEDS OFF
+	LD	A,%00001000		; SELECT AND ASSERT RESET, LEDS OFF
+	OUT	(C),A			; SEND IT
+ 	CALL	LDELAY			; HALF SECOND DELAY
+	LD	A,%00001100		; SELECT AND DEASSERT RESET, LEDS OFF
 	OUT	(C),A			; SEND IT
 	XOR	A			; SIGNAL SUCCESS
 	RET				; RETURN
@@ -207,7 +224,7 @@ CEN_DETECT:
 	JR	Z,CEN_DETECT1		; FOUND IT, RECORD IT
 	LD	A,CEN_NONE		; NOTHING FOUND
 	RET				; DONE
-;	
+;
 CEN_DETECT1:
 	; CEN FOUND, RECORD IT
 	LD	A,CEN_MBC		; RETURN CHIP TYPE