diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 228f7007..f8cecf38 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -514,20 +514,9 @@ HBX_ROM:
         OR      A                       ; SET FLAGS
         JP      P,HBX_ROM               ; BIT 7 INDICATES RAM
         OUT     (MPCL_ROM),A            ; ENSURE ROM PAGE OUT OF MEMORY BEFORE SWITCH
-;
-
-HBX_MMMSK .EQU	$+1			; FORCE TOP 32K		; MASK POPULATED
+	; SEE MBC RUNTIME MEMORY SIZE ADJUSTMENT
+HBX_MBCMSK .EQU	$+1			; FORCE TOP 32K		; MASK POPULATED
 	XOR	%00000000		; TO BE IN FIRST CHIP	; DURING INITIALIZATION
-
-;
-;#IF (RAMSIZE == 256)
-;	XOR	%00000100		; TOP 32K IS ALWAYS IN FIRST CHIP
-;#ENDIF
-;
-;#IF (RAMSIZE == 1024)
-;	XOR	%00010000		; TOP 32K IS ALWAYS IN FIRST CHIP
-;#ENDIF
-;
         OUT     (MPCL_RAM),A            ; SET RAM PAGE SELECTOR
 	JR	HBX_RAMX
 HBX_ROM:
@@ -1273,6 +1262,9 @@ Z280_INITZ:
 	LD	A,1
 	OUT	(MPGENA),A
 #ENDIF
+;
+; AT THIS POINT, RAM SHOULD BE AVAILABLE IN THE COMMON BANK
+; (TOP 32K).
 ;
 	DIAG(%00000011)
 ;
@@ -1314,16 +1306,34 @@ Z280_INITZ:
 	LD	BC,HBX_SIZ
 	LDIR
 ;
-;	RUNTIME MEMORY SIZE ADJUSTMENT
+; THIS IS WHERE WE SHOULD PROBE FOR THE ACTUAL NUMBER OF RAM
+; BANKS AVAILABLE IN THE SYSTEM.  THE PROBE CODE WOULD NEED
+; TO BE COPIED TO AND RUN FROM THE COMMON RAM BANK.
+;
+; MBC RUNTIME MEMORY SIZE ADJUSTMENT
+;
+; THE MBC RAM BOARD CAN CONTAIN 1 OR 2 RAM CHIPS.  THEY CAN BE
+; EITHER 128K OR 512K EACH.  SO THE MBC RAM BAORD CAN HAVE A
+; TOTAL OF 128K, 256K, 512K, OR 1024K.  THE COMMON (HIMEM) RAM
+; IS ALWAYS MAPPED TO THE LAST 32K OF THE FIRST CHIP ON THE BOARD.
+; IF THERE ARE TWO CHIPS ON THE BOARD, THIS MEANS THE COMMON
+; BANK WILL APPEAR IN THE "MIDDLE" OF THE PHYSICAL RAM BANKS.
+; ROMWBW NEEDS THE COMMON BANK TO BE AT THE LAST BANK OF PHYSICAL
+; RAM IN ORDER TO HAVE SEQUENTIAL RAM BANKS AVAILABLE FOR THE
+; RAM DISK.  TO WORK AROUND THIS, WE FLIP THE HIGH BIT OF THE
+; BANK ID FOR AN MBC SYSTEM IFF IT HAS 2 CHIPS (256K OR 1024K).
+; THE CODE BELOW GENERATES THE CORRECT MASK TO ACCOMPLISH THIS
+; AND THEN POKES THE MASK INTO AN XOR INSTRUCTION IN THE MBC
+; MEMORY MANAGER.
 ;
 #IF (MEMMGR == MM_MBC)
-	LD	HL,HCB + HCB_RAMBANKS	; IN NUMBER OF RAMBANKS DETECTED FOR MBC
+	LD	HL,CB_RAMBANKS		; IN NUMBER OF RAMBANKS DETECTED FOR MBC
 	LD	A,%11101011		; IS 4 (128KB) OR 16 (512KB) THEN
 	AND	(HL)			; ZERO THE LAST BANK MASK OTHERWISE
-	JR	Z,MB128512		; CALCULATE THE LAST BANK MASK (BANKS/2)
+	JR	Z,MBC_SINGLE		; CALCULATE THE LAST BANK MASK (BANKS/2)
 	RRA				; 256K = %00000100, 1024K = %00010000
-MB128512:
-	LD	(HBX_MMMSK),A		
+MBC_SINGLE:
+	LD	(HBX_MBCMSK),A		
 #ENDIF
 ;
 ; IF APPBOOT, RESTORE CURRENT BANK ID
@@ -1349,6 +1359,7 @@ MB128512:
 	LD	DE,0
 	LD	BC,$8000
 	CALL	HBX_BNKCPY
+;
 #IF (1)
 ;
 ; POPULATE THE CRITICAL RAM BANK NUMBERS.
@@ -1379,6 +1390,7 @@ CB_IDS:	LD	(HL),A				; POPULATE CB_BIDCOM
 	DEC	A
 	SUB	TOT_RAM_RB
 	LD	(HL),A
+;
 #ENDIF
 ;
 ; TRANSITION TO HBIOS IN RAM BANK
@@ -2091,7 +2103,7 @@ HB_Z280BUS1:
 	CALL	PRTSTRD
 	.TEXT	"KB ROM, $"
 ;
-	LD	HL,(HCB + HCB_RAMBANKS)	; GET NUMBER OF BANKS IN L
+	LD	HL,(CB_RAMBANKS)	; GET NUMBER OF BANKS IN L
 	LD	H,0			; CALCULATE RAM SIZE
 	ADD	HL,HL
 	ADD	HL,HL			; X4
@@ -2103,6 +2115,18 @@ HB_Z280BUS1:
 	CALL	PRTSTRD
 	.TEXT	"KB RAM$"
 ;
+#IF 0
+;
+; DIAGNOSTIC DISPLAY OF BANK IDS IN HCB
+;
+	CALL	PRTSTRD
+	.TEXT	", BANK IDS:$"
+	LD	DE,CB_BIDCOM
+	LD	A,8
+	CALL	PRTHEXBUF
+;
+#ENDIF
+;
 #IF (CPUFAM == CPU_Z280)
 	CALL	NEWLINE
 	PRTS("Z280: $")
@@ -3568,8 +3592,9 @@ SYS_GETCPUINFO:
 ;     E: COUNT OF RAM BANKS
 ;
 SYS_GETMEMINFO:
-	LD	D,ROMSIZE / 32
-	LD	A,(HCB + HCB_RAMBANKS)
+	LD	A,(CB_ROMBANKS)
+	LD	D,A
+	LD	A,(CB_RAMBANKS)
 	LD	E,A
 	XOR	A
 	RET
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 2bde16ac..2828a57f 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -507,7 +507,7 @@ BID_ROMN	.EQU	(BID_ROM0 + ((ROMSIZE / 32) - 1))
 BID_RAMN	.EQU	(BID_RAM0 + ((RAMSIZE / 32) - 1))
 ;
 BID_RAMD0	.EQU	BID_RAM0	; FIRST RAM DRIVE BANK			 ^  RAM
-BID_RAMDN	.EQU	BID_RAMN - 8	; LAST RAM DRIVE BANK			 |  DRIVE
+BID_RAMDN	.EQU	BID_RAMN - TOT_RAM_RB	; LAST RAM DRIVE BANK		 |  DRIVE
 ;					; OS BUFFERS CP/M3?			-+ THESE
 ;					; OS BUFFERS CP/M3?			 | MAKE
 ;					; OS BUFFERS CP/M3?			 | UP
diff --git a/Source/HDIAG/util.asm b/Source/HDIAG/util.asm
index 33e47560..b78525d2 100644
--- a/Source/HDIAG/util.asm
+++ b/Source/HDIAG/util.asm
@@ -14,7 +14,7 @@ prtstr:
 	call	cout			; display character
 	jr	prtstr			; loop till done
 ;
-; Print a string from a lookup table pointed to by HL, entry A
+; Print a string from a lookup table pointed to by HL, index A
 ; with a prefix string at DE.  HL, DE, and A are trashed.
 ;
 prtstrtbl:
diff --git a/Source/ver.inc b/Source/ver.inc
index 59618853..4758c3aa 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.118"
+#DEFINE BIOSVER	"3.1.1-pre.119"
diff --git a/Source/ver.lib b/Source/ver.lib
index bc0fe77a..43784d5d 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.118"
+	db	"3.1.1-pre.119"
 	endm