Commodore 1571 firmware
Load Directory
.page
.subttl 'lstdir.src'
; start the directory loading function
; get the buffer and get it started
stdir lda #0
sta sa
lda #1 ; allocate chanl and 1 bufefer
jsr getrch
lda #0
jsr setpnt
ldx lindx
lda #0
sta lstchr,x
jsr getact
tax
lda drvnum
sta lstjob,x
lda #1 ; put sal in buffer
jsr putbyt
lda #4 ; put sah in buffer
jsr putbyt
lda #1 ; insert fhoney links (0101)
jsr putbyt
jsr putbyt
lda nbtemp
jsr putbyt ; put in drvnum
lda #0
jsr putbyt
jsr movbuf ; get disk name
jsr getact
asl a
tax
dec buftab,x
dec buftab,x
lda #0 ; end of this line
jsr putbyt
dir1 lda #1 ; insert fhoney links ($0101)
jsr putbyt
jsr putbyt
jsr getnam ; get #bufrs and file name
bcc dir3 ; test if last entry
lda nbtemp
jsr putbyt
lda nbtemp+1
jsr putbyt
jsr movbuf
lda #0 ; end of entry
jsr putbyt
bne dir1
dir10 jsr getact
asl a
tax
lda #0
sta buftab,x
lda #rdytlk
ldy lindx
sta dirlst
sta chnrdy,y ; directory list buffer full
lda data
rts
dir3 lda nbtemp ; this is end of load
jsr putbyt
lda nbtemp+1
jsr putbyt
jsr movbuf
jsr getact
asl a
tax
dec buftab,x
dec buftab,x
lda #0 ; end of listing (000)
jsr putbyt
jsr putbyt
jsr putbyt
jsr getact
asl a
tay
lda buftab,y
ldx lindx
sta lstchr,x
dec lstchr,x
jmp dir10
; transfer file name to listing buffer
movbuf ldy #0
movb1 lda nambuf,y
jsr putbyt
iny
cpy #27
bne movb1
rts
; get char for directory loading
getdir jsr getbyt
beq getd3
rts
getd3 sta data
ldy lindx
lda lstchr,y
beq gd1
lda #eoiout
sta chnrdy,y
lda data
rts
gd1
pha
jsr dir1
pla
rts