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