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opnchnl.src
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opnchnl.src
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.page
.subttl 'opnchnl.src'
; opnchnl
; open a read chanl with 2 buffers
; will insert sa in lintab
; and inits all pointers.
; relative ss and ptrs are set.
opnrch lda #1 ; get one data buffer
jsr getrch
jsr initp ; clear pointers
lda type
pha
asl a
ora drvnum
sta filtyp,x ; set file type
jsr strrd ; read 1st one or two blocks
ldx lindx
lda track
bne or10
lda sector
sta lstchr,x ; set last char ptr
or10
pla
cmp #reltyp
bne or30 ; must be sequential stuff
ldy sa
lda lintab,y ; set channel as r/w
ora #$40
sta lintab,y
lda rec
sta rs,x ; set record size
jsr getbuf ; get ss buffer
bpl or20
jmp gberr ; no buffer
or20
ldx lindx
sta ss,x
ldy trkss ; set ss track
sty track
ldy secss ; set ss sector
sty sector
jsr seth ; set ss header
jsr rdss ; read it in
jsr watjob
orow
ldx lindx
lda #2
sta nr,x ; set for nxtrec
lda #0
jsr setpnt ; set first data byte
jsr rd40 ; set up 1st record
jmp gethdr ; restore t&s
or30
jsr rdbyt ; sequential set up
ldx lindx
sta chndat,x
lda #rdytlk
sta chnrdy,x
rts
; initialize variables for open chanl
; lstjob,sets active buffer#,lstchr,
; buffer pointers in buftab=2
;<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
initp ldx lindx
lda buf0,x
asl a
bmi 1$ ; *** rom ds 02/27/85 ***
tay
lda #2
sta buftab,y
1$ lda buf1,x
ora #$80
sta buf1,x
asl a
bmi 2$ ; *** rom ds 02/27/85 ***
tay
lda #2
sta buftab,y
2$ lda #0
sta nbkl,x
jmp ptch41 ; *** rom ds 02/27/85 ***
nop ; fill
; sta nbkh,x
; lda #0
; sta lstchr,x
; rts
;<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
; open a write chanl with 2 buffers
opnwch jsr intts ; get first track,sector
lda #1
jsr getwch ; get 1 buffers for writing
jsr sethdr ; set up buffer headers
jsr initp ; zropnt
ldx lindx
lda type
pha
asl a
ora drvnum
sta filtyp,x ; set filtyp=seq
pla
cmp #reltyp
beq ow10
lda #rdylst ; active listener
sta chnrdy,x
rts
ow10
ldy sa
lda lintab,y
and #$3f
ora #$40
sta lintab,y ; set channel as r/w
lda rec
sta rs,x ; set record size
jsr getbuf ; get ss buffer
bpl ow20
jmp gberr ; no buffer
ow20
ldx lindx
sta ss,x
jsr clrbuf
jsr nxtts
lda track
sta trkss ; save ss t&s
lda sector
sta secss
ldx lindx
lda ss,x
jsr seth ; set ss header
lda #0
jsr setssp
lda #0 ; set null link
jsr putss
lda #ssioff+1 ; set last char
jsr putss
lda #0 ; set this ss #
jsr putss
lda rec ; record size
jsr putss
lda track
jsr putss
lda sector
jsr putss
lda #ssioff
jsr setssp
jsr gethdr ; get first t&s
lda track
jsr putss
lda sector
jsr putss
jsr wrtss ; write it out
jsr watjob
lda #2
jsr setpnt
ldx lindx ; set nr for null buffer
sec
lda #0
sbc rs,x
sta nr,x
jsr nulbuf ; null records
jsr nullnk
jsr wrtout
jsr watjob
jsr mapout
jmp orow
;*
;*
;***********************
;*
;* putss
;*
;* put byte into side sector
;*
;***********************
;*
;*
putss pha
ldx lindx
lda ss,x
jmp putb1