.NLIST
	.TITLE	VD     - VIRTUAL DISK PREFIX FILE
;
;	GET UCB OFFSETS.
;
	.MCALL	UCBDF$		;DEFINE UCB OFFSETS
	UCBDF$	<:>,<=>
;
; DEFINE ADDITIONAL UCB OFFSET.
;
U.NXT	= U.VCB+2		;EXTENSION BLOCK ADDRESS
;
; DEFINE EXTENSION BLOCK OFFSETS.
;
	.ASECT
.	= 0
X.OFF:	.BLKB	4	;DISK FILE OFFSETS
X.UCB:	.BLKB	2	;NEXT UCB ADDRESS
X.FLG:	.BLKB	2	;EXTENSION FLAGS
X.FNB:	.BLKB	36	;FILENAME BLOCK
X.UIC:	.BLKB	2	;BINARY UIC OF FILE
	.IF GE	V$$RSN-32 ;FOR RSX-11M V3.2 OR LATER
X.LABL:	.BLKB	12.	;VOLUME LABEL OF HOST DISK
	.ENDC
X.LGTH	= .		;LENGTH OF EXTENSION BLOCK
	.PSECT
;
; DEFINE EXTENSION FLAG BITS
;
XF.RON	= 1			;ALLOW ONLY READ ACCESS

;
; DEFINE THE ASSEMBLY PARAMETERS.  THESE WILL BE DEFINED HERE ONLY
; IF THEY ARE NOT DEFINED IN RSXMC.
;

	.IFNDF	V$$D11

V$$D11	= 16.			;NUMBER OF VD'S
LD$VD	= 0			;MAKE VDDRV LOADABLE

	.ENDC

$MAXVS	= 32.			;MAXIMUM NUMBER OF LOGICAL VS: UNITS TO USE

R$$SOB	= 1			;ENABLE SOB INSTRUCTION

	.LIST