File size: 7,948 Bytes
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; Drive Code for UltiCopy
;
; Programmed by Gideon Zweijtzer
;
; Copyright (c) 2013 - Gideon Zweijtzer
;
;-------------------------------------------------
*=$0400
drive_code_start
.logical $0400
iec_datain = $01
iec_dataout = $02
iec_clkin = $04
iec_clkout = $08
iec_atna = $10
ctrl_step = $01
ctrl_motor = $04
ctrl_led = $08
ctrl_wprot = $10
ctrl_density = $20
ctrl_sync = $80
via_iec = $1800 ; port B cia1
via_sysctrl = $1801 ; port A cia1 (track0 sense, 1/2 MHz, side ...)
via_timer = $1805 ; cia1 timer
via_ctrl = $1c00 ; port B cia2 (sync, motor, etc)
via_data = $1c01 ; port A cia2
via_data_dir = $1c03; port A cia 2
via_mode = $1c0c
data_buffer = $0300
shifted_table = $0700
sectors_to_read = $06c0
last_part = $01ba
bin_to_gcr = $f77f
region_limits = $fed7
region_sectors = $fed1
attempts = $8c
temp1 = $8d
sectors_read = $8e
sectors_on_this_track = $8f
current_track = $90
zone = $91
transfer_pointer = $92
transfer_end = $94
drive_start
jmp start_copy
jmp read_disk
send_block
; do synchronization with receiver
; set data, wait for clock set
; clear data, wait for clock clear
; pulse data+clock together
; clear data+clock
lda #iec_dataout
sta via_iec
-
lda #iec_clkin
and via_iec
beq -
lda #0
sta via_iec
lda #iec_clkin
-
and via_iec
bne -
;; setup pointer
lda #$80
ldx #<data_buffer
ldy #>data_buffer
jsr send_sub_block
lda #$80
ldx #<(data_buffer+$80)
ldy #>(data_buffer+$80)
jsr send_sub_block
lda #$44
ldx #<last_part
ldy #>last_part
jsr send_sub_block
rts
send_sub_block
sta transfer_end
stx transfer_pointer
sty transfer_pointer+1
lda #(iec_clkout + iec_dataout) ;2
sta via_iec ;4 <-- start
lda #0 ;2
sta via_iec ;4 -- 6 us pulse
;; pulse (6) -- 15 -- bits: 8 8 8 21
;; sample +4us (center of 8)
;; wait for both clock and data low (start of 6 us pulse)
;; then wait 6+15+4 = 25 us, then cycle through pattern 8 8 8 21 8 8 8 21
;; transfer block
ldy #$00 ; 2
-
lda (transfer_pointer),y ; 5
tax ; 2
and #$0f ; 2
sta via_iec ; bit 3/1 ; 4
asl ; 2
and #$0f ; 2
sta via_iec ; bit 2/0 ; 4
lda shifted_table,x ; 4
sta via_iec ; bit 7/5 ; 4
asl ; 2
and #$0f ; 2
sta via_iec ; bit 6/4 ; 4
iny ; 2
cpy transfer_end ; 3
bne - ; 3*
; -- 45 --
lda #0
sta via_iec
rts
send_error
sta temp1
; do synchronization with receiver
; set clock, wait for data set
; clear clock, wait for data clear
lda #iec_clkout
sta via_iec
- lda #iec_datain
and via_iec
beq -
lda #0
sta via_iec
- lda #iec_datain
and via_iec
bne -
lda #1
ldx #<temp1
ldy #>temp1
jmp send_sub_block
start_copy
jsr create_shift_table
lda #0 ; remove ourselves from the bus
sta via_iec
jsr wait_bus_free
jsr seek_track_1
cmp #1
beq read_disk
sei
jsr send_error ; failed
cli
rts
read_disk
jsr $f97e ; turn motor on
jsr wait_a_little
sei
lda #$08
sta via_sysctrl ; make sure we're running at 1 MHz and try to read side 0
lda #1
-
jsr calculate_zone ; sets current track, zone and sectors on track
jsr read_track ; read and transfer track
beq +
ora #$c0
jsr send_error
+ jsr step_in ; move head half track
jsr step_in ; move head half track
lda current_track
clc
adc #$01
cmp #36
bne -
tay
dey
- jsr step_out
jsr step_out
dey
bne -
lda #0
jsr send_error ; done!
cli
jmp $f98f ; turn off drive motor and exit
calculate_zone ; (track number in a)
sta current_track
ldx #$04
- cmp region_limits-1,x
dex
bcs -
lda region_sectors,x
sta sectors_on_this_track
txa
asl
asl
asl
asl
asl
sta zone
lda via_ctrl
and #$9f
ora zone
sta via_ctrl
rts
seek_track_1
sei
lda #$c0
sta $01
cli
- lda $01
bmi -
lda $01
cmp #$01
beq +
ora #$20
rts
+ sei
lda #$b0
sta $01
lda #$01
sta $08
lda #$00
sta $09
cli
- lda $01
bmi -
lda $01
rts
step_in
lda via_ctrl
tax
and #$fc
sta temp1
inx
sssi
txa
and #$03
ora temp1
sta via_ctrl
lda #$98
sta via_timer
- bit via_timer
bmi -
rts
step_out
lda via_ctrl
tax
and #$fc
sta temp1
dex
jmp sssi
read_track
lda sectors_on_this_track
jsr prepare_sector_table
lda #$ee
sta via_mode
lda #$00
sta via_data_dir
lda #$00
sta sectors_read
- jsr read_sector
bne +
jsr send_block
lda sectors_read
cmp sectors_on_this_track
bne -
lda #0
+ rts
create_shift_table
ldx #0
-
txa
lsr
lsr
lsr
lsr
sta shifted_table,x
inx
bne -
rts
read_sector
lda #100
sta attempts
_next_attempt
dec attempts
lda attempts
bpl +
_out
lda #1 ; SECTOR NOT FOUND
rts
; turn on LED
+ lda #ctrl_led
ora via_ctrl
sta via_ctrl
; set timer and wait for sync
lda #$d0
sta via_timer
- bit via_timer
bmi +
lda #2 ; NO SYNC
rts
+ bit via_ctrl
bmi -
; check for header
lda via_data
clv
- bvc -
clv
lda via_data
cmp #$52
bne _next_attempt
- bvc -
clv
lda via_data
and #$c0
eor #$40
bne _next_attempt
- bvc -
clv
lda via_data
and #$0f
eor #$05
bne _next_attempt
- bvc -
clv
lda via_data
lsr
lsr
tax
lda sectors_to_read,x
bmi _next_attempt
; note: x holds GCR code for sector number
; we know enough about the header now
; skip the rest
; wait for sync and data block
- bit via_ctrl
bmi -
lda via_data
clv
ldy #0
- bvc -
clv
lda via_data
cmp #$55
bne _next_attempt
- bvc -
clv
lda via_data
sta data_buffer,y
iny
bne -
ldy #$bf
- bvc -
clv
lda via_data
sta last_part-$bf,y
iny
bne -
- bvc -
clv
lda via_data
and #$f0
sta last_part+$41
lda sectors_to_read,x
tay
lda #$ee ; done!
sta sectors_to_read,x
sty last_part+$42 ; current sector (binary)
lda current_track
sta last_part+$43
;; checksum to last_part+$43.. but why, for transfer errors?
; turn led off
lda #(255-ctrl_led)
and via_ctrl
sta via_ctrl
inc sectors_read
lda #0 ; OK
rts
; prepare sector table (a = number of sectors)
; the result of this function is a 64-byte table
; that has a valid binary sector number stored on
; the position indexed by a 6-bit GCR pattern.
; all other patterns are $ff
prepare_sector_table
tay
lda #$ff
ldx #$3f
- sta sectors_to_read,x
dex
bpl -
- dey
tya
and #$0f
tax
lda bin_to_gcr,x
sta temp1
tya
and #$10
asl
ora temp1
tax
tya
sta sectors_to_read,x
cpy #$00
bne -
rts
wait_bus_free
lda #ctrl_led
ora via_ctrl
sta via_ctrl
lda #0
sta via_iec
- lda via_iec
and #$0f
bne -
lda #255-ctrl_led
and via_ctrl
sta via_ctrl
rts
wait_a_little
ldy #200
- inx
bne -
dey
bne -
rts
.cerror *>$6c0
.here
drive_code_end
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