mirror of
https://github.com/SEPPDROID/Digital-Research-Source-Code.git
synced 2025-10-26 01:44:21 +00:00
56 lines
1.3 KiB
Plaintext
56 lines
1.3 KiB
Plaintext
|
||
; BDOS symbols:
|
||
|
||
on EQU 0ffffh
|
||
off EQU 00000h
|
||
|
||
; 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)
|
||
maxext EQU 31 ;largest extent number
|
||
maxmod EQU 63 ;largest module number
|
||
fwfmsk EQU 80h ;file write flag is high
|
||
;order modnum
|
||
namlen EQU 15 ;name length
|
||
;lstfcb EQU fcblen-1
|
||
|
||
drv EQU 0 ;drive field
|
||
f1 EQU 1 ;file name byte 1 to 8
|
||
;f2 EQU 2
|
||
;f3 EQU 3
|
||
;f4 EQU 4
|
||
f5 EQU 5
|
||
;f6 EQU 6
|
||
f7 EQU 7
|
||
f8 EQU 8
|
||
|
||
; reserved file indicators
|
||
|
||
rofile EQU 9 ;t1' -> read/only file
|
||
sysfil EQU 10 ;t2' -> system file
|
||
ARCHIV EQU 11 ;t3' -> FILE HAS BEEN ARCHIVED
|
||
extnum EQU 12 ;extent number field
|
||
chksum EQU 13 ;unfilled bytes field
|
||
modnum EQU 14 ;data module number
|
||
reccnt EQU 15 ;record count field
|
||
dskmap EQU 16 ;disk map field
|
||
nxtrec EQU fcblen
|
||
ranrec EQU nxtrec+1 ;random record field (3 bytes)
|
||
|
||
|