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rel1.src
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rel1.src
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.page
.subttl rel1
;***********************************
;*
;* routine: nxtrec
;*
;***********************************
nxtrec lda #ovrflo
jsr clrflg
lda #lrf
jsr tstflg
bne nxtr40
ldx lindx
inc recl,x ;goto next record #
bne nxtr15
inc rech,x
nxtr15 ldx lindx
lda nr,x
beq nxtr45 ;there is a nr
jsr getpnt ;get pointer
ldx lindx ;test if same buffer
cmp nr,x
bcc nxtr20 ;yes, bt<nr
jsr nrbuf ;no,next buffer
nxtr20 ldx lindx
lda nr,x
jsr setpnt ;advance to next rec
lda (buftab,x) ;read 1st dat byte
sta data ;save for read channel
lda #ovrflo
jsr clrflg ;clear the overflow flag
jsr addnr ;advance nr
nxout pha
bcc nxtr30 ;no block boundary
lda #0
jsr drdbyt ;check track link
bne nxtr30 ;not last block
pla
cmp #2
beq nxtr50
nxtr45 lda #lrf
jsr setflg
nxtr40 jsr getpre
lda buftab,x
sta lstchr,y
lda #cr
sta data
rts
nxtr50 jsr nxtr35
ldx lindx
lda #0
sta nr,x
rts
nxtr30 pla
nxtr35 ldx lindx
sta nr,x
jmp setlst
;**********************************
;*
;* nrbuf
;*
;********************************
nrbuf jsr setdrn ;read trk,sec link
jsr rdlnk
jsr gaflgs ;test if dirty
bvc nrbu50 ;clean, dont write out
jsr wrtout ;dirty, write out
jsr dblbuf ;toggle active buffer
lda #2
jsr setpnt
jsr tstwrt ;test if lstjob is wrt
bne nrbu20 ;not a write,buffer ok
jsr rdab ;read in needed buffer
jmp watjob ;wait around till done
nrbu50 jsr dblbuf ;toggle act buf
jsr tstwrt ;was lstjob a wrt?
bne nrbu70 ;not a write
jsr rdab ;read in needed buffer
jsr watjob ;wait till done
nrbu70 jsr rdlnk ;read trk,sec link to do a read ahead
lda track ;test if last buffer
beq nrbu20 ;yes,no dbl buff todo
jsr dblbuf ;start read job on the
jsr rdab ;inactive buffer
jsr dblbuf
nrbu20 rts
; .end