diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index 8cbf68c1..aa245aae 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -76,17 +76,6 @@ MEMTOP		.EQU	$10000
 ;
 #IFDEF PLTUNA
 #INCLUDE "../UBIOS/ubios.inc"
-;
-; EQUATES BELOW SHOULD BE REPLACED WITH RUNTIME CALLS TO UNA GET BIOS INFO FUNCS
-;
-RAMSIZE		.EQU	512
-;
-BID_RAM0	.EQU	$8000
-BID_RAMN	.EQU	(BID_RAM0 + ((RAMSIZE / 32) - 1))
-;
-BID_RAMD0	.EQU	BID_RAM0	; FIRST RAM DRIVE BANK
-BID_BIOS	.EQU	BID_RAMN - 2	; BIOS BANK
-BID_USR		.EQU	BID_RAMN - 1	; USER BANK (CP/M TPA, ETC.)
 #ENDIF
 ;
      	.ORG	CBIOS_LOC		; DEFINED IN STD.ASM
@@ -311,7 +300,6 @@ DPBCNT	.EQU	($ - DPBMAP) / 2
 BOOT:
 	; STANDARD BOOT INVOCATION
 	LD	SP,STACK	; STACK FOR INITIALIZATION
-
 ;
 	; COPY INITIALIZATION CODE TO RUNNING LOCATION $8000
 	LD	HL,BUFPOOL
@@ -362,7 +350,7 @@ WBOOT:
 #IFDEF PLTUNA
 	; RESTORE COMMAND PROCESSOR FROM UNA BIOS CACHE
 	LD	BC,$01FB	; UNA FUNC = SET BANK
-	LD	DE,BID_BIOS	; UBIOS_PAGE (SEE PAGES.INC)
+	LD	DE,(BNKBIOS)	; UBIOS_PAGE (SEE PAGES.INC)
 	RST	08		; DO IT
 	PUSH	DE		; SAVE PREVIOUS BANK
 	
@@ -1525,6 +1513,11 @@ BNKBIOS		.DB	0		; BIOS BANK ID
 BNKUSER		.DB	0		; USER BANK ID
 #ENDIF
 ;
+#IFDEF PLTUNA
+BNKBIOS		.DW	0		; BIOS BANK ID
+BNKUSER		.DW	0		; USER BANK ID
+#ENDIF
+;
 ; DOS DISK VARIABLES
 ;
 DSKOP		.DB	0		; DISK OPERATION (DOP_READ/DOP_WRITE)
@@ -1833,14 +1826,24 @@ INIT:
 	LD	(CBIOS_LOC + 1),HL	; STORE IT IN FIRST ENTRY OF CBIOS JUMP TABLE
 
 #IFDEF PLTUNA
+	; GET CRITICAL BANK ID'S
+	LD	BC,$03FA		; UNA FUNC = GET CUR EXEC ENV
+	CALL	$FFFD			; DE = CUR EXEC PAGE, HL = UBIOS PAGE
+	LD	(BNKBIOS),HL		; SAVE UBIOS PAGE
+	LD	BC,$05FA		; UNA FUNC = GET USER EXEC ENV
+	CALL	$FFFD			; DE = USER LOW PAGE, HL = USER HIGH PAGE (COMMMON)
+	LD	(BNKUSER),DE		; SAVE USER PAGE
+	LD	DE,$8000		; RAM DRIVE STARTS AT FIRST RAM BANK
+	LD	(BNKRAMD),DE		; SAVE STARTING RAM DRIVE BANK
+
 	; MAKE SURE UNA EXEC PAGE IS ACTIVE
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_USR		; SWITCH BACK TO EXEC BANK
+	LD	DE,(BNKUSER)			; SWITCH BACK TO EXEC BANK
 	CALL	$FFFD			; DO IT (RST 08 NOT YET INSTALLED)
 
 	; COPY BIOS PAGE ZERO TO USER BANK
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_BIOS		; UBIOS_PAGE (SEE PAGES.INC)
+	LD	DE,(BNKBIOS)		; UBIOS_PAGE (SEE PAGES.INC)
 	CALL	$FFFD			; DO IT (RST 08 NOT YET INSTALLED)
 	PUSH	DE			; SAVE PREVIOUS BANK
 	
@@ -1863,6 +1866,7 @@ INIT:
 	LD	(8),A			; STORE AT 0x0008
 	LD	HL,($FFFE)		; UNA ENTRY VECTOR
 	LD	(9),HL			; STORE AT 0x0009
+
 #ELSE
 	; GET CRITICAL BANK ID'S
 	LD	B,BF_SYSGET		; HBIOS FUNC=GET SYS INFO
@@ -1911,7 +1915,7 @@ INIT:
 	LD	(CCPBUF),HL	; SAVE THE ADDRESS (IN BIOS MEM)
 
 	LD	BC,$01FB	; UNA FUNC = SET BANK
-	LD	DE,BID_BIOS	; UBIOS_PAGE (SEE PAGES.INC)
+	LD	DE,(BNKBIOS)	; UBIOS_PAGE (SEE PAGES.INC)
 	RST	08		; DO IT
 	PUSH	DE		; SAVE PREVIOUS BANK
 
@@ -2201,7 +2205,7 @@ MD_INIT4:
 #IF (CLRRAMDISK != CLR_NEVER)
 	DI				; NO INTERRUPTS
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_RAMD0		; FIRST BANK OF RAM DISK
+	LD	DE,(BNKRAMD)		; FIRST BANK OF RAM DISK
 	CALL	$FFFD			; DO IT (RST 08 NOT SAFE HERE)
 
 #IF (CLRRAMDISK == CLR_AUTO)
@@ -2226,7 +2230,7 @@ CLRRAM1:
 CLRRAM2:
 #ENDIF
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_USR		; SWITCH BACK TO EXEC BANK FOR WRITESTR
+	LD	DE,(BNKUSER)		; SWITCH BACK TO EXEC BANK FOR WRITESTR
 	CALL	$FFFD			; DO IT (RST 08 NOT SAFE HERE)
 
 	CALL	NEWLINE2		; FORMATTING
@@ -2234,7 +2238,7 @@ CLRRAM2:
 	CALL	WRITESTR		; DISPLAY IT
 
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_RAMD0		; FIRST BANK OF RAM DISK
+	LD	DE,(BNKRAMD)		; FIRST BANK OF RAM DISK
 	CALL	$FFFD			; DO IT (RST 08 NOT SAFE HERE)
 
 	LD	HL,0			; SOURCE ADR FOR FILL
@@ -2243,7 +2247,7 @@ CLRRAM2:
 	CALL	FILL			; DO IT
 CLRRAM3:
 	LD	BC,$01FB		; UNA FUNC = SET BANK
-	LD	DE,BID_USR		; SWITCH BACK TO EXEC BANK
+	LD	DE,(BNKUSER)		; SWITCH BACK TO EXEC BANK
 	CALL	$FFFD			; DO IT (RST 08 NOT SAFE HERE)
 	EI				; RESUME INTERRUPTS
 
@@ -2306,9 +2310,6 @@ CLRRAM3:
 #IFDEF PLTUNA
 ;
 DRV_INIT:
-	; INIT DEFAULT DRIVE TO A: FOR NOW
-	XOR	A			; ZERO
-	LD	(DEFDRIVE),A		; STORE IT
 ;
 ; PERFORM UBIOS SPECIFIC INITIALIZATION
 ; BUILD DRVMAP BASED ON AVAILABLE UBIOS DISK DEVICE LIST
@@ -2319,6 +2320,14 @@ DRV_INIT:
 	LD	D,L			; SAVE L AS UNIT
 	LD	E,0			; SLICE IS ZERO
 	LD	(BOOTVOL),DE		; D -> UNIT, E -> SLICE
+;
+	; INIT DEFAULT
+	LD	A,D			; BOOT UNIT?
+	CP	1			; IF ROM BOOT, DEF DRIVE SHOULD BE B:
+	JR	Z,DRV_INIT1		; ... SO LEAVE AS IS AND SKIP AHEAD
+	XOR	A			; ELSE FORCE TO DRIVE A:
+DRV_INIT1:
+	LD	(DEFDRIVE),A		; STORE IT
 ;
 	; SETUP THE DRVMAP STRUCTURE
 	LD	HL,(HEAPTOP)		; GET CURRENT HEAP TOP
@@ -2366,6 +2375,14 @@ DRV_INIT5:
 	LD	A,E			; SLICES PER VOLUME VALUE TO ACCUM
 	LD	(HDSPV),A		; SAVE IT
 ;
+	LD	DE,(BOOTVOL)		; BOOT VOLUME (UNIT, SLICE)
+	LD	A,1			; ROM DISK UNIT?
+	CP	D			; CHECK IT
+	JR	Z,DRV_INIT5A		; IF SO, SKIP BOOT DRIVE
+	LD	B,1			; JUST ONE SLICE PLEASE
+	CALL	DRV_INIT8A		; DO THE BOOT DEVICE
+;
+DRV_INIT5A:
 	; SETUP TO ENUMERATE DEVICES TO BUILD DRVMAP
 	LD	B,0			; START WITH UNIT 0
 ;
@@ -2394,7 +2411,21 @@ DRV_INIT7:	; PROCESS CURRENT UNIT (SEE UNA PROTOIDS.INC)
 	LD	A,(HDSPV)		; GET SLICES PER VOLUME TO ACCUM
 	LD	B,A			; MOVE TO B FOR LOOP COUNTER
 ;
-DRV_INIT8:	; SLICE CREATION LOOP
+DRV_INIT8:
+	; SLICE CREATION LOOP
+	; DE=UNIT/SLICE, B=SLICE CNT
+	LD	A,(BOOTVOL + 1)		; GET BOOT UNIT
+	CP	1			; ROM BOOT?
+	JR	Z,DRV_INIT8A		; IF SO, OK TO CONTINUE
+	CP	D			; COMPARE TO CUR UNIT
+	JR	NZ,DRV_INIT8A		; IF NE, OK TO CONTINUE
+	LD	A,(BOOTVOL)		; GET BOOT SLICE
+	CP	E			; COMPARE TO CUR SLICE
+	JR	NZ,DRV_INIT8A		; IF NE, OK TO CONTINUE
+	INC	E			; IS BOOT DU/SLICE, SKIP IT
+	JR	DRV_INIT8		; AND RESTART LOOP
+;
+DRV_INIT8A:	; ENTRY POINT TO SKIP BOOT DISK/LU CHECK
 ;
 	; INC DRVMAP ENTRY COUNT AND CHECK FOR 16 ENTRY MAXIMUM
 	LD	HL,(DRVMAPADR)		; POINT TO DRIVE MAP
@@ -2546,7 +2577,7 @@ DRV_INIT5:
 ;	LD	B,E			; COUNT TO B
 ;	LD	C,0			; USE C AS DEVICE LIST INDEX
 ;
-	LD	DE,(HCB + HCB_BOOTVOL)	; BOOT VOLUME (UNIT, SLICE)
+	LD	DE,(BOOTVOL)		; BOOT VOLUME (UNIT, SLICE)
 	LD	A,1			; ROM DISK UNIT?
 	CP	D			; CHECK IT
 	JR	Z,DRV_INIT5A		; IF SO, SKIP BOOT DRIVE
@@ -3001,11 +3032,17 @@ DPHTOP	.DW	0			; CURRENT TOP OF DPH POOL
 DIRBUF	.DW	0			; DIR BUF POINTER
 HEAPTOP	.DW	BUFPOOL			; CURRENT TOP OF HEAP
 BOOTVOL	.DW	0			; BOOT VOLUME, MSB=BOOT UNIT, LSB=BOOT SLICE
-BNKRAMD	.DB	0			; STARTING BANK ID FOR RAM DRIVE
 HDSPV	.DB	2			; SLICES PER VOLUME FOR HARD DISKS (MUST BE >= 1)
 DRVLST	.FILL	32			; ACTIVE DRIVE LIST USED DURINT DRV_INIT
 DRVLSTC	.DB	0			; ENTRY COUNT FOR ACTIVE DRIVE LIST
 ;
+#IFDEF PLTWBW
+BNKRAMD	.DB	0			; STARTING BANK ID FOR RAM DRIVE (WBW)
+#ENDIF
+#IFDEF PLTUNA
+BNKRAMD	.DW	0			; STARTING BANK ID FOR RAM DRIVE (UNA)
+#ENDIF
+;
 CMD	.DB	CMDLEN - 2
 	.TEXT	"SUBMIT PROFILE"
 	.DB	0
diff --git a/Source/HBIOS/romldr.asm b/Source/HBIOS/romldr.asm
index 8da83d8e..844a1de4 100644
--- a/Source/HBIOS/romldr.asm
+++ b/Source/HBIOS/romldr.asm
@@ -737,6 +737,15 @@ GOBOOTDISK1:
 	LD	(BL_COUNT),A		; ... AND SAVE IT
 ;
 #IF (BIOS == BIOS_UNA)
+;
+	; START OS LOAD AT SECTOR 3
+	LD	C,$41			; UNA FUNC: SET LBA
+	LD	A,(BL_BOOTID)		; GET BOOT DEVICE ID
+	LD	B,A			; MOVE TO B
+	LD	DE,0			; HI WORD OF LBA IS ALWAYS ZERO
+	LD	HL,3			; LOAD STARTING INFO SECTOR 2
+	RST	08			; SET LBA
+	JP	NZ,DB_ERR		; HANDLE ERROR
 ;
 	; READ OS IMAGE INTO MEMORY
 	LD	C,$42			; UNA FUNC: READ SECTORS