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mach_f256_16.s
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mach_f256_16.s
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ll_mult:
.a8
stz 1
.a16
pla
sta MULU_A_L
pla
sta MULU_B_L
lda MULU_LL
pha
jmp do_next
ll_slash_mod:
.a8
stz 1
.a16
lda 1,s
sta DIVU_D_L
lda 3,s
sta DIVU_N_L
lda QUOT_L
sta 1,s
lda REMU_L
sta 3,s
jmp do_next
gotoxy:
.ax8
pha
stx screen_x
sty screen_y
stz 1
lda #80
sta MULU_A_L
stz MULU_A_H
sty MULU_B_L
stz MULU_B_H
lda MULU_LL
sta scrptr
lda MULU_LH
ora #$c0
sta scrptr+1
ldx screen_x
stx $d014
ldx screen_y
stx $d016
pla
rts
dispchar:
.ax8
pha
ldx 1
ldy #2
sty 1
ldy screen_x
sta (scrptr),y
stx 1
iny
sty screen_x
cpy #80
bcc _done
stz screen_x
lda screen_y
cmp #59
bcc _inc_y
lda #1
jsr scroll_up
ldx screen_x
ldy screen_y
jsr gotoxy
bra _done
_inc_y:
inc screen_y
clc
lda scrptr
adc #80
sta scrptr
bcc _done
inc scrptr+1
_done:
lda 1
ldx #0
stx 1
ldx screen_x
stx $d014
ldx screen_y
stx $d016
sta 1
pla
rts
mach_init0:
.ax8
sei
stz 1
stz $db02
lda #$ff
sta $db03
rts
mach_init1:
.ax8
lda 1
pha
stz 1
lda #1 ;text mode only
sta $d000 ; Vicky master control
lda #$00 ; 80x60, single x, single y, font set 0
sta $d001 ; Vicky master control
lda #3 ; Cursor enable, rate = 1/2s
sta $d010 ; Cursor control
lda #$8d ; Cursor character
sta $d012
stz $d014 ; Cursor to 0,0
stz $d015
stz $d016
stz $d017
pla
sta 1
rts
mach_reset:
.ax8
stz 1
lda #$de
sta $d6a2
lda #$ad
sta $d6a3
lda $d6a0
ora #$80
sta $d6a0
and #$7f
sta $d6a0
;; Reset-we should never reach here.
mach_hex_char:
.ax8
tsx
lda $101,x
and #$0f
cmp #10
bcc _is_digit
clc
adc #55
bra _done
_is_digit:
clc
adc #$30
_done:
sta $101,x
jmp do_next
screenfill:
.ax8
ldx #0
ldy #0
jsr gotoxy
_d:
jsr dispchar
ldy screen_y
cpy #59
bne _d
ldx screen_x
cpx #79
bne _d
rts
hex_digit .text "0123456789ABCDEF"
ip_disp_addr = $c000 + (1 * 80) + 72
ip_disp_label .null "IP:"
word_disp_addr = $c000 + (0 * 80) + 72
rsp_disp_addr = $c000 + (2 * 80) + 72
psp_disp_addr = $c000 + (3 * 80) + 72
here_disp_addr = $c000 + (4 * 80) + 72
pstk_disp_addr = $c000 + (5 * 80) + 72
here_disp_label .null "H :"
hon:
.ax8
ldy #4
- lsr
dey
bne -
and #$0f
tax
lda hex_digit,x
rts
lon:
.ax8
and #$0f
tax
lda hex_digit,x
rts
show_ip:
.ax8
ldx #0
- lda ip_disp_label,x
beq +
sta ip_disp_addr,x
inx
bra -
+ lda w+1
pha
jsr hon
sta ip_disp_addr+3
pla
jsr lon
sta ip_disp_addr+4
+ lda w
pha
jsr hon
sta ip_disp_addr+5
pla
jsr lon
sta ip_disp_addr+6
rts
show_here:
.ax8
ldx #0
- lda here_disp_label,x
beq +
sta here_disp_addr,x
inx
bra -
+ lda here_store+1
pha
jsr hon
sta here_disp_addr+3
pla
jsr lon
sta here_disp_addr+4
+ lda here_store
pha
jsr hon
sta here_disp_addr+5
pla
jsr lon
sta here_disp_addr+6
rts
show_word:
.ax8
sec
lda w
sbc #7 ; Just use the space after-padding, not len
sta mac
lda w+1
sbc #0
sta mac+1
ldy #0
- lda (mac),y
sta word_disp_addr,y
iny
cpy #5
bne -
rts
show_rsp:
.ax8
lda #'R'
sta rsp_disp_addr
lda #':'
sta rsp_disp_addr+1
lda rsp
pha
jsr hon
sta rsp_disp_addr+2
pla
jsr lon
sta rsp_disp_addr+3
lda #','
sta rsp_disp_addr+4
.a16
lda #rstk_top
sec
sbc rsp
lsr
.a8
pha
jsr hon
sta rsp_disp_addr+5
pla
jsr lon
sta rsp_disp_addr+6
rts
show_psp:
.ax8
lda #'P'
sta psp_disp_addr
lda #':'
sta psp_disp_addr+1
tsx
txa
pha
jsr hon
sta psp_disp_addr+2
pla
jsr lon
sta psp_disp_addr+3
lda #','
sta psp_disp_addr+4
tsx
txa
eor #$ff
lsr
pha
jsr hon
sta psp_disp_addr+5
pla
jsr lon
sta psp_disp_addr+6
rts
mach_delay:
.ax8
ldx #10
x ldy #0
y dey
bne y
dex
bne x
rts
mach_dbg:
rts
.ax8
;rts
;; A has low order of new IP
lda $01
pha
lda #2
sta $01
jsr show_word
jsr show_ip
jsr show_rsp
jsr show_psp
jsr show_here
pla
sta $01
jsr mach_delay
rts
con_init:
.ax8
stz 1
lda #0
sta $d004 ;turn off the border?
lda #32
jsr screenfill
ldx #0
ldy #0
jsr gotoxy
rts
con_tx:
.ax8
cmp #8 ; backspace
bne _maybe_13
jmp do_bs
_maybe_13
cmp #13
bne _maybe_10
ldx #0
ldy screen_y
jmp gotoxy
_maybe_10
cmp #10
bne _doout
ldy screen_y
iny
cpy #59
bcc _no_scroll
lda #1
jsr scroll_up
ldy screen_y
_no_scroll:
ldx screen_x
jmp gotoxy
_doout
jmp dispchar
con_rx:
.ax8
stz 1 ; Page 0 of I/O control
lda #$ff
sta $db03
stz $db02
_try_again
lda #%01111111
sta $db01
nop
nop
lda $db00
ldx #2
stx $01
sta ip_disp_addr
stz 1
cmp #$ff
beq _try_again
lda #65
rts
raw_bs:
lda #8
rts
do_bs:
.ax8
dec screen_x
bpl _do_erase
inc screen_x
_do_erase:
ldx screen_x
ldy screen_y
jsr gotoxy
ldx screen_x
ldy screen_y
lda #32
jsr dispchar
dec screen_x
ldx screen_x
ldy screen_y
jsr gotoxy
rts
;; A has the number of lines. >=60 is "clear screen"
;; mac0,1 == dest
;; mac2,3 == src
;; mac4 == scroll count
scroll_up:
.ax8
cmp #60
bcc _in_bounds
lda #60
_in_bounds:
stz 1 ; Access coproc, etc.
sta mac+4 ; Save line count
sta MULU_B_L
lda #$c0 ; Initial destination
stz mac+0
sta mac+1
lda #80
sta MULU_A_L
stz MULU_A_H
stz MULU_B_H
lda MULU_LL
sta mac+2
lda MULU_LH
ora #$c0
sta mac+3
;; set up move loop
lda #2 ; Text memory
sta 1
sec
lda #60
sbc mac+4
tax
_move_another:
ldy #0
cpx #0
beq _do_blanks
_do_line_copy:
lda (mac+2),y
sta (mac+0),y
iny
cpy #80
bne _do_line_copy
clc
lda mac+0
adc #80
sta mac+0
lda mac+1
adc #0
sta mac+1
clc
lda mac+2
adc #80
sta mac+2
lda mac+3
adc #0
sta mac+3
dex
bra _move_another
_do_blanks:
sec
lda #60
sbc mac+4
stz 1
sta MULU_A_L
stz MULU_A_H
lda #80
sta MULU_B_L
stz MULU_B_H
lda MULU_LL
sta mac+0
lda MULU_LH
ora #$c0
sta mac+1
ldx mac+4 ; number of lines to blank
ldy #2
sty 1
_blank_line:
ldy #0
lda #32
_blank_char:
sta (mac+0),y
iny
cpy #80
bne _blank_char
clc
lda mac+0
adc #80
sta mac+0
lda mac+1
adc #0
sta mac+1
dex
bne _blank_line
rts
pagesize:
rts