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MPM OPERATING SYSTEMS/MPM-86/MPM-86 2.0 SOURCES/01/EQU.BDO

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+;
+;			BDOS symbols:
+;
+on	EQU	0ffffh
+off	EQU	00000h
+testf	EQU	off
+;
+;		Special 8086 symbols:
+;
+b	equ	byte ptr 0
+w	equ	word ptr 0
+;
+;       literal constants
+;
+enddir	EQU	0ffffh		;end of directory
+;
+;	file control block (fcb) constants
+;
+fcblen	EQU	32		;fcb length
+empty	EQU	0e5h		;empty directory entry
+lstrec	EQU	127		;last record# in extent
+recsiz	EQU	128		;record size
+dirrec	EQU	recsiz/fcblen	;directory elts / record
+dskshf	EQU	2		;log2(dirrec)
+dskmsk	EQU	dirrec-1
+fcbshf	EQU	5		;log2(fcblen)
+extnum	EQU	12		;extent number field
+maxext	EQU	31		;largest extent number
+ubytes	EQU	13		;unfilled bytes field
+modnum	EQU	14		;data module number
+maxmod	EQU	63		;largest module number
+fwfmsk	EQU	80h		;file write flag is high
+				;order modnum
+namlen	EQU	15		;name length
+reccnt	EQU	15		;record count field
+dskmap	EQU	16		;disk map field
+lstfcb	EQU	fcblen-1
+nxtrec	EQU	fcblen
+ranrec	EQU	nxtrec+1	;random record field (2 bytes)
+;
+;	reserved file indicators
+;
+rofile	EQU	9		;high order of first type char
+invis	EQU	10		;invisible file in dir command
+ARCHIVE	EQU	11		;FILE HAS BEEN ARCHIVED ATTRIBUTE
+;
+