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antyajek.xsm
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antyajek.xsm
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; -----------------------------------------------------------------------------
;
; "Anty *AJEK Copy", done by Seban/Slight
;
; .O. released at 2021.6.12
; ..O
; OOO >>> Public Domain <<<
;
; some infos:
;
; - 1st version was released in 1992 (v.1.0)
; and was written using MAC/65 macro-assembler
;
; - this version is re-formated to XASM syntax
;
; - some necessary fixes was done but, source code
; is stil messy and far away from perfection. Sorry,
; but more cleanup in this old code makes no sense ;)
;
; - use XASM to compile (https://github.com/pfusik/xasm)
;
; changelog:
;
; @2021.06.14
; v.1.2 - changed I/O durig write operation (now writes are much faster)
;
opt h+
; screen editor control codes
UP equ 28
DOWN equ 29
LEFT equ 30
RIGHT equ 31
BACKSPACE equ 126
EOL equ 155
DEL_LINE equ 156
; OS vectors & locations
MEMLO equ $02e7
CIO equ $e456
EOUTCH equ $f2b0
GETKEY equ $f2fd
BELL equ $f556
CLR_SCR equ $f420
; OS zero page variables
ROWCRS equ $54 ; cursor position (row)
COLCRS equ $55 ; cursor position (column)
; local zero-page variables
org $ec
status org *+1 ; bit accumulation register when reading from tape
crc org *+1 ; CRC of data readed from tape
sync_flag org *+1 ; sync-tone "presence" flag
wr_flag org *+1 ; write flag -> non zero means data present in buffer
hdr org *+4 ; data-segment header bytes (start_addr, end_addr)
ptr org *+2 ; buffer pointer
cnt org *+2 ; loop counter
endp org *+2 ; this pointer holds end of data in buffer
dlen org *+2
dlft org *+2
ert *>$ff
; tables & buffers
buff equ $400
buff_size equ $100
ert buff_size>$100
org $0500
; -----------------------------------------------------------------------------
; program messages
msg0 dta EOL,c"*",2,c"Anty *AJEK Copy 1.2"*,22,c"* - MEM: $",RIGHT,RIGHT,RIGHT,RIGHT
dta EOL,RIGHT,c"done by Seban/Slight (P) 1992,2021",EOL,EOL
dta c"Disk drive number ?"
msg1 dta DEL_LINE,c"Enter ",c" OUTPUT "*,c" filename:",EOL
msg2 dta UP,DEL_LINE,DEL_LINE
msg3 dta c" - Correct (",c"Y"*,c"/N) ?"
msg4 dta DEL_LINE,RIGHT,c"1) 2000F / AST",EOL,RIGHT,c"2) K.S.O. 2000",EOL
dta DOWN,RIGHT,RIGHT,RIGHT,c"Your choice ?"
msg5 dta EOL,DOWN,c"Working...",EOL
msg6 dta UP,DEL_LINE,c"status #$"
msg7 dta c" - press key to restart !",EOL
msg_err dta c"Error #$"
msg_end
; message address table
msg_adr dta a(msg0),a(msg1),a(msg2),a(msg3)
dta a(msg4),a(msg5),a(msg6),a(msg7)
dta a(msg_err),a(spec),a(space)
; message length table
msg_len dta b(msg1-msg0),b(msg2-msg1),b(msg3-msg2),b(msg4-msg3)
dta b(msg5-msg4),b(msg6-msg5),b(msg7-msg6),b(msg_err-msg7),b(msg_end-msg_err)
dta b(fxt-spec),b(fxt-space-1)
; filespec & filename buffers
space dta c" " ; don't touch! must be before filespec!
spec dta c"D1:" ; filespec prefix
buf dta c" .XEX",EOL ; filename buffer
fxt dta c".XEX" ; filename extension
ert *>$6ff
org $b800 ; code location (just under screen area)
top equ *
; -----------------------------------------------------------------------------
; NMI/IRQ off, motor on, turbo interface on
play inc $d40e ; disable NMI
sei ; disable IRQ
dec $d301 ; turn off OS
lda #0
sta $d400 ; disable ANTIC DMA (screen off)
sta crc ; init the CRC value
lda #%00111000 ; motor-off + DIR reg. select
sta $d302 ; setup PACTL
lda #%01100000 ; setup PORTA I/O direction (bit #6 i bit #5 as outputs)
sta $d300
lda #%00110100
sta $d302 ; turn motor ON
sta $d303 ; enable COMMAND line
rts
; -----------------------------------------------------------------------------
; restore NMI/IRQ, turn motor off, turbo interface off
stop lda #%00111000 ; motor-off + DIR reg. select
sta $d302 ; setup PACTL
lda #0 ; all portA pins as inputs
sta $d300
lda #%00111100 ; motor-off + DATA reg. select
sta $d302
sta $d303 ; de-activate COMMAND line
lda #$ff
sta $d301 ; restore OS-ROM
lsr $d40e ; restore NMI's
cli ; restore IRQ's
rts
; -----------------------------------------------------------------------------
; set interface mode
;
; IN: Y=0 -> Turbo K.S.O.2000 [read from PORTA register ($D300), bit #7]
; Y=1 -> Turbo 2000F/AST [read from SKCTL register ($D20F), bit #4]
set_ifc ldx tb1,y ; get value from 1st table
stx q0+1 ; ... put directly
stx q3+1 ; ... in subroutines code
stx w1+1 ; (self mod. code used)
stx w6+1
ldx tb2,y ; get value from 2nd table
stx q0+2 ; ... and do the same
stx q3+2 ; (self mod. code used again)
stx w1+2
stx w6+2
ldx tb3,y ; get value from 3rd table
stx q2+1 ; ... and again
stx w5+1 ; use to modify the subroutines code
rts
; turbo interfaces register-set tables
tb1 dta $00,$0f ; lo-byte of DATA register address
tb2 dta $d3,$d2 ; hi-byte of DATA register address
tb3 dta $80,$10 ; mask value to separate bit value from DATA register
; -----------------------------------------------------------------------------
; wait for sync tone
wait ldy #0 ; clr. sync pulse counter
lda #$ff ; init sync "found" flag
sta sync_flag
q2 lda #$80 ; we will test bit #7 in "KSO 2000" mode
q0 bit $d300 ; test PORTA
bne q0 ; wait until logic "0"
ldx #0 ; clear pulse len.
stx $d01a ; set COLBACK (black color)
q1 inx ; inc. pulse len. count
bmi wait ; pulse to long, restart seq!
q3 bit $d300 ; test PORTA
beq q1 ; loop when logic "0" is present
lda #$c8 ; load green-light colour value...
sta $d01a ; then put in COLBAK register
cpx #54 ; compare pulse length
bcc wait ; if shorter than 54, restart sync! (pulse to short)
iny ; inc. sync-pulse counter
bne q2 ; loop until 256 sync-pulses found!
rts
; -----------------------------------------------------------------------------
; read byte from tape-stream
read ldy #8 ; # of bits to get
w4 ldx $d20a ; get random byte
w5 lda #$80 ; we will test bit #7 in "KSO 2000" mode
w1 bit $d300 ; test PORTA
bne w1 ; wait for logic "0"
stx $d01a ; put random number into COLBACK register
ldx #0 ; clear X reg. (will be used as pulse-length counter)
w2 inx ; increment X reg.
w6 bit $d300 ; test PORTA (in "KSO 2000" mode)
beq w2 ; wait for logic "1"
lda #$38 ; put light-red...
sta $d01a ; ...into COLBACK register
cpx #54 ; compare pulse length
bcs w3 ; jump when longer then #54
ror sync_flag ; shift "sync flag" (that means sync-tone perion is over)
cpx #32 ; compare pulse length again
rol status ; shift out carry bit into byte accumulation reg.
dey ; decrement bit counter
bne w4 ; loop until all 8 bit is read
lda status ; load decoded byte into A reg.
ldy #1 ; set operation status to 1
rts ; return
w3 ldx #$45 ; sync-detected, change colour
bit sync_flag ; test if sync-tone period was over
bmi w5 ; loop when bit #7 is set! (sync pulses still present)
stx status ; when error, destroy byte in accumulation reg. (to avoid fake $ff bytes)
ldy #140 ; return with error #140 in Y reg.
rts
; -----------------------------------------------------------------------------
; print hex number
;
; IN: A reg. byte value to print as HEX
prn_hex pha ; store value of byte to print
lsr @ ; ...
lsr @ ; ...
lsr @ ; ...
lsr @ ; now we have the upper nibble of byte shifted to lowe nibble
jsr digit ; print the lower nibble
pla ; restore byte value
; and print the lower-nibble
digit and #$0f ; mask out the upper nibble
cmp #$0a ; when >9 the carry but is set
sed ; enable 6502 decimal mode
adc #'0' ; add ASCII value of "0". In the "decimal" hex digits are adjusted
cld ; disable BCD/Decimal mode
jmp EOUTCH ; print out the char via system editor
; -----------------------------------------------------------------------------
; get key seq. and put if into buffer
get_ln ldy #0
e2 sty grg+1 ; save value of Y reg.
jsr GETKEY ; call OS GETKEY routine
grg ldy #0 ; restore value of Y reg.
cmp #EOL ; is RETURN was pressed?
beq ret ; yes!
cmp #BACKSPACE ; is BACKSPACE was pressed?
beq del
cpy #8 ; max. filename length?
bcs e2 ; yes! then loop (then only RETURN or BACKSPACE keys allowed)
cmp #'0' ; entered char is lower than "0" key?
bcc e2 ; yes! so... char belongs to not-allowed chars, loop!
cmp #'[' ; entered char is hirer or equal than "[" key?
bcs e2 ; yes! so... char belongs to not-allowed chars, loop!
sta buf,y ; store entered char into filename buffer!
jsr putc ; print out the char on screen
iny ; incr. index reg.
bne e2 ; loop
del cpy #0 ; is there anything to delete?
beq e2 ; nope! so do the loop!
dey ; decr. index
lda #BACKSPACE ; send BACKSPACE...
jsr putc ; code to the screen (erase char before cursor)
lda #' ' ; ... the load "SPACE" value
sta buf,y ; store it into buffer
bne e2 ; and do the loop!
ret cpy #0 ; if RETURN was pressed check if buffer is not empty!
beq e2 ; when empty, do the loop!
rts ; filename entered properly, return!
; -----------------------------------------------------------------------------
; put char routine
putc sty pry+1 ; store Y reg. value
stx prx+1 ; store X reg. value
jsr EOUTCH ; call system editor char-out
pry ldy #0
prx ldx #0
rts
; -----------------------------------------------------------------------------
; selects disk drive number
drv_sel jsr GETKEY ; call OS Get Key routine
cmp #EOL ; RETURN was pressed?
beq drv_dfl ; yes! select default drive (#1)
cmp #'1' ; check if drive number < 1
bcc drv_sel ; yep! that's wrong, so do the loop
cmp #'9' ; check if drive number > 8
bcs drv_sel ; yep! that's wrong to! loop!
; all OK! so we can store in filespec location
; but we must skip loading default value
dta $2c ; we can use bit $xxxx mnemonic to skip next instruction!
drv_dfl lda #'1' ; setup default drive (#1)
sta spec+1
rts
; -----------------------------------------------------------------------------
; prepare filename
;
; ... adds extension+EOL after first space found in filename
add_ext ldy #0 ; init index reg. (for filename)
fn_slp lda buf,y ; search buffer...
cmp #32 ; for "SPACE" character
beq fn_fnd ; found!
iny ; next char
cpy #8 ; all 8 chars of filename?
bne fn_slp ; nope! do the loop!
fn_fnd ldx #0 ; init next index reg. (for extension)
fn_sxt lda fxt,x ; load (next) extension char
sta buf,y ; store in filename buffer
iny ; incr. index of filename
inx ; incr. index of ext.
cpx #4 ; all chars of filename extension?
bcc fn_sxt ; nope!
lda #EOL ; End of Line code
sta buf,y ; add at end of buffer!
rts ; return
; -----------------------------------------------------------------------------
; print out error message
;
; IN: Y reg. - error code value to print
sig_err tya ; store error code (passed in Y reg.)
pha ; ... on stack
lda #8 ; print "Error #$" message
jsr prn_msg
pla ; restore error code
jsr prn_hex ; print it as hex
jsr close ; close channel #1 (may be opened!)
lda #EOL
jsr putc ; print-out EOL
jsr BELL ; make "BELL" sound
jsr GETKEY ; wait for key
jmp main ; restart program
; -----------------------------------------------------------------------------
; print message (mesage ID in A reg.)
prn_msg tay ; put message ID into Y reg.
asl @ ; *2
tax ; put message ID*2 into X reg.
lda msg_len,y ; get message length from lookup table
sta $348 ; store in CIO length (lo-byte)
lda msg_adr+0,x ; get lo-byte of message address
sta $344
lda msg_adr+1,x ; get hi-byte of message address
sta $345
lda #$0b ; CIO "block write" command
sta $342
ldx #0 ; select CIO channel #0 (system editor "E:")
stx $349 ; clear the hi-byte of block length
jmp CIO ; call OS CIO routine
; -----------------------------------------------------------------------------
; close CIO channel #1
close ldx #$10 ; select CIO channel #1
lda #$0c ; "close" command
sta $342,x
jmp CIO
; -----------------------------------------------------------------------------
; open CIO channel #1 for binary write
open ldx #$10 ; select CIO channel #1
lda #$03 ; "open" command
sta $342,x
lda #<spec ; set address of filespec.
sta $344,x
lda #>spec
sta $345,x
lda #8 ; open for "write"
sta $34a,x
lda #0
sta $34b,x ; set ICAX2 to zero
jmp CIO ; call OS CIO routine
; -----------------------------------------------------------------------------
; put byte from A reg. to an output-stream
bput pha
ldx #$10
lda #$0b ; put bytes/write binary CIO command
sta $342,x
lda #0 ; set data length to zero
sta $348,x
sta $349,x
pla
jmp CIO ; write byte from A register to opened file
; -----------------------------------------------------------------------------
; increment data pointer (skip reserved areas; program area and H/W reg. area)
inc_ptr inc ptr+0 ; increment lo-byte
bne in_rts ; if no overflow then just return
inc_hpt inc ptr+1 ; increment hi-byte
pha ; store A reg. value on stack
lda ptr+1 ; load Hi-byte of address
cmp #>top ; check if address in not in program area
bne in_nxt ; nope, do next checks
lda #$c0 ; pointer is in program area (>top)
; then skip this area, ant set new address ($C000 -> RAM under OS-ROM)
bne in_set ; save new address!
in_nxt cmp #$d0 ; check pointer address is not in hardware I/O space (>= $D000)
bne in_done ; nope! all checks done!
lda #$d8 ; set new address after hardware I/O space ($D800)
in_set sta ptr+1
in_done pla
in_rts rts
; -----------------------------------------------------------------------------
; moves MEMLO value to ptr
mlo2ptr ldx MEMLO+0 ; load lo-byte of MEMLO
ldy MEMLO+1 ; load hi-byte of MEMLO
stx ptr+0 ; store lo
sty ptr+1 ; store hi
rts
; -----------------------------------------------------------------------------
; code starts here
main ldx #$ff
txs ; init stack pointer
stx $2fc ; clear last key-pressed
stx $2c5 ; set font brightness
inx
stx $22f ; turn off ANTIC's DMA (screen off!)
stx $2c6 ; set background color to black
jsr CLR_SCR ; call OS clear screen routine
ldy #11
e7 lda #' ' ; initialize filename buffer
cpy #8
bcc *+5
lda fxt-8,y
sta buf,y
dey
bpl e7
; calculate size of input data buffer
sec ; calculate (MEMTOP-MEMLO)
lda #<top
sbc MEMLO+0
pha
lda #>top
sbc MEMLO+1
clc ; add extra RAM under OS-ROM ($C000-$CFFF=>$1000 and $D800-$FFFF=>$2800)
adc #$38 ; $3800 bytes ($38/#56 pages) of additional memory
; print out calculated free memory
ldx #34 ; set the cursor position
stx COLCRS
inc ROWCRS
jsr prn_hex ; hi-byte
pla
jsr prn_hex ; lo-byte
dec ROWCRS ; move cursor to upper line
lda #0 ; print welcome message
jsr prn_msg
lda #$22 ; restore ANTIC DMA
sta $22f
jsr drv_sel ; call drive select subroutine
lda #1 ; print message "Enter OUTPUT filename..."
jsr prn_msg
lda #9 ; print the initial filespec
jsr prn_msg
lda #6 ; set the cursor in proper position
sta COLCRS
dec ROWCRS
lda #LEFT
jsr putc
jsr get_ln ; call get line procedure
; refresh filename
lda #2 ; print out "line del" sequence
jsr prn_msg
lda #10 ; print entered filespec
jsr prn_msg
; ask to confirm filename
lda #3 ; print "correct ?" message
jsr prn_msg
jsr GETKEY ; get user answer
cmp #'Y' ; user agrees?
bne main ; no! restart
jsr add_ext ; add extension to the filename
; Turbo System Selection (T2000F/AST or K.S.O. 2000)
lda #4 ; print "interface type" selection message
jsr prn_msg
sel_lp jsr GETKEY ; read key
cmp #'1' ; T2000F/AST
beq sel_don
cmp #'3'
bcs sel_lp ; bad key! loop!
sel_don jsr putc ; put char on screen (pressed key/selected option)
and #$01 ; mask out invalid values
tay ; push to Y reg.
jsr set_ifc ; call interface type select subroutine
lda #5 ; print out "Working..." message
jsr prn_msg
; start processing data
jsr close ; CLOSE channel #1
jsr open ; try to OPEN channel #1
bpl opn_ok ; jump if opened OK!
jmp sig_err ; error occurred!
opn_ok lda #$ff ; put $FF,$FF header bytes at output file
jsr bput
jsr bput
; start reading data segment from tape
sync_lp jsr play ; init turbo interface
jsr wait ; wait for sync-tone
bpl ok ; found and all is OK!
; tape error
tap_err jsr stop ; stop turbo interface
ldy #140 ; load error code
jmp sig_err ; handle the error!
; sync-tone found, time to read file header
ok jsr mlo2ptr ; copy MEM-LO to buffer pointer
lda #$00 ; init wr_flag
sta wr_flag
nxt_blk lda #4 ; set counter (# of header bytes to read from tape)
sta cnt
lda #hdr ; put header address direct in code (self mod. code)
sta hdr_loc+1
hdr_lop jsr read ; read byte from stream (byte is in A reg.)
; bmi tap_err ; !!! don't check error's in 4 byte header !!!
; last block with EoF marker ($ff,$ff) is intentionally corrupted
hdr_loc sta hdr ; store it header area
clc ; update crc
adc crc
sta crc
inc hdr_loc+1 ; inc. header adr.
dec cnt ; decr. header bytes counter
bne hdr_lop ; repeat until all bytes of header is readed
lda hdr+0 ; check header bytes
and hdr+1
cmp #$ff ; $FF,$FF means end of file!
bne *+5
jmp eof
; copy header to output buffer
ldx #0 ; init loop counter
ldy #0 ; clear Y reg. (offset=0)
hdr_cpy lda hdr,x ; copy header bytes...
sta (ptr),y ; ... to dest. pointer adr.
jsr inc_ptr ; incr. dest. pointer
inx ; next byte
cpx #4 ; all bytes of header done?
bcc hdr_cpy ; no, then loop!
; time to read data block from tape
;
; we need to calculate bytes to read => (end_address - start_address +1)
sec ; subtract lo-bytes
lda hdr+2
sbc hdr+0
tax
lda hdr+3 ; subtract hi-bytes
sbc hdr+1
tay
inx ; +1 to calculated segment size
bne *+3
iny
stx cnt+0 ; store result into cnt variable
sty cnt+1
blk_lop jsr read
bmi tap_err ; check for transmission errors
ldy #0 ; store data in output buffer
sta (ptr),y
clc ; update CRC
adc crc
sta crc
jsr inc_ptr ; increment buffer pointer
lda cnt+0 ; decrement counter (block length)
bne *+4
dec cnt+1
dec cnt+0
lda cnt+0 ; any data left?
ora cnt+1
bne blk_lop ; loop until data is present
; time to read and check CRC!
j7 jsr read ; read CRC byte from stream
cmp crc ; compare with actual CRC
beq crc_ok
; handle CRC error
jsr stop ; stop the tape
ldy #143 ; load CRC Error value
jmp sig_err ; handle error!
crc_ok lda #0 ; clear CRC before reading next block
sta crc
inc wr_flag ; inc. wr_flag (means that data segment is present in buffer)
; check if that was INIT-segment
ldx hdr+2
ldy hdr+3
cpx #$e3 ; compare Lo-byte
bne nxxt
cpy #$02 ; compare Hi-byte
beq *+5
nxxt jmp nxt_blk ; non INIT segment, so read next block.
ini_seg jsr stop ; turn off motor and turbo interface
; save data blocks to disk
jsr sav_bfr ; save segment to disk
bpl *+5 ; check I/O status
wr_err jmp sig_err
jmp sync_lp ; read next blocks
; end of file
eof jsr stop ; stop the tape, turbo interface off!
lda wr_flag ; check if any data left in buffer
beq done ; zero means => no data present
jsr sav_bfr ; save remaining data from buffer
bmi wr_err
done lda #6 ; print "status" message
jsr prn_msg
jsr close ; close CIO channel #1
tya
jsr prn_hex ; print out status
lda #7 ; print "press any key" message
jsr prn_msg
lda #$ff
sta $2fc ; clear last-key pressed (if any)
jsr GETKEY ; wait for key
jmp main ; restart program
; -----------------------------------------------------------------------------
; this procedure writes the data from buffer to output file
sav_bfr ldx ptr+0 ; store end of data address
ldy ptr+1
stx endp+0 ; in code body (self mod. code)
sty endp+1
jsr mlo2ptr ; setup buffer pointer
cploop sec ; calculate how many data do write left
lda endp+0 ; data_left = end_pointer - actual_pointer
sbc ptr+0
sta dlft+0
lda endp+1
sbc ptr+1
sta dlft+1
ldx #<buff_size ; load temporaty buffer size to X,Y regs.
ldy #>buff_size
lda dlft+0 ; compare if data_left < temporary buffer size
cmp #<buff_size
lda dlft+1
sbc #>buff_size
bcs setl ; data_left is greater than temporty buffer size
ldx dlft+0 ; if data_left < buffer size, load the...
ldy dlft+1 ; ... remainning data size to X,Y regs.
lda #0
sta wr_flag ; when the last block of data in buffer, clear the wr_flag
setl stx dlen+0 ; update data_len
sty dlen+1
txa
bne dat_pr
tya
beq wrt_don
dat_pr lda ptr+1 ; check if actual buffer pointer...
cmp #$c0 ; is under OS-ROM?
bcc nram ; nope! no need to turn of the OS-ROM when copying data
inc $d40e ; disable NMI's
sei ; disable IRQ's
dec $d301 ; turn off OS-ROM
nram ldy #0 ; copy data...
ccpl lda (ptr),y ; ... from main buffer
sta buff,y ; ... to temporary buffer
iny
cpy #<buff_size
bne ccpl
jsr inc_hpt ; increment hi-byte od buffer pointer
; (this skips the reserved memory areas!)
lda #$ff ; enable OS-ROM
sta $d301
cli ; restore IRQ
lsr $d40e ; restore NMI
; write out the buffer
ldx #$10
lda #$0b ; put bytes/write binary CIO command
sta $342,x
lda #<buff ; set buffer address
sta $344,x
lda #>buff
sta $345,x
lda dlen+0 ; setup length of data to write
sta $348,x
lda dlen+1
sta $349,x
jsr CIO ; write block (from buffer) to opened file
bmi wrt_err
lda wr_flag
bne cploop
wrt_don ldy #$01 ; return with status = 1 (no error!)
wrt_err rts
ert *>$bc1f ; check if code does not destroy Display List & Screen memory
run main ; generate RUN segment
end