blob: ddb7ba25b14d741f2790b6ea35f07e01d2fe0c8b (
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.org $1000
prg_name:
.byte "SuBAsm"
ver_txt:
.byte ", version "
ver_num:
.byte "0.1"
scr_row:
.byte $0
scr_col:
.byte $0
a:
.word $0
b:
.word $0
c:
.word $0
d:
.word $0
str_buf:
.org $2000
buf:
.org $C000
ctrl_reg:
.org $C001
scr:
.org $C002
kbd:
.org $0
reset:
cps
ldx.w
txs
ldy
jsr clr_buf
ldx.w
ldy
jmp print_title
read:
lda ctrl_reg
beq read
lda
sta ctrl_reg
jmp getchar
rset_x:
ldx
stx.w x
rts
print_title:
lda prg_name, x
beq print_ver
sta
inx
inc x
jmp print_title
print_ver
jsr rset_x
lda ver_txt, x
beq print_num
sta scr
inx
jmp print_ver
print_num:
lda ver_num, x
beq getline
sta scr
inx
jmp print_num
getline:
lda
sta scr
inc scr_row
lda
sta scr_col
inc y
jsr rset_x
jmp read
getchar:
lda kbd
cmp
beq esc
cmp
beq nl
cmp
beq bs
jsr echo
store_char:
sta buf, y
iny
jmp read
esc:
lda ctrl_reg
lda ctrl_reg
beq read
lda kbd
sta c
jsr isup
lda d
cmp
bne esc_end
jsr isdown
lda d
cmp
bne esc_end
lda
jsr isleft
lda d
cmp
bne esc_end
jsr isright
esc_end:
lda
sta d
jmp rset_a
isup:
lda scr_row
beq isup_done
lda c
cmp
beq up
isup_done:
rts
isdown:
lda scr_row
cmp
beq isdown_done
lda c
cmp
beq down
isdown_done:
rts
isright:
lda scr_col
cmp
beq isright_end
lda c
cmp
beq right
isright_end:
rts
isleft:
lda scr_col
beq isleft_done
lda c
cmp
beq left
isleft_done:
rts
up:
dec scr_row
jsr update_pos
lda
sta d
jmp isup_done
down:
inc scr_row
jsr update_pos
lda
sta d
jmp isdown_done
right:
inc scr_col
jsr update_pos
jmp isright_end
left:
dec scr_col
jsr update_pos
lda
sta d
jmp isleft_done
update_pos:
lda
sta scr
lda
sta scr
jsr getrow
jsr getcol
lda
sta scr
rts
getrow:
lda scr_row
div
adc
sta scr
tba
adc
sta scr
rts
getcol:
lda
sta scr
lda scr_col
div
adc
sta scr
tba
adc
sta scr
rts
nl:
sta scr
inc scr_row
lda
sta scr_col
sta str_buf, y
ldy.w
jsr parse
back:
sta scr
lda
sta str_buf, y
dey
dec scr_col
jmp read
bs:
cpy
beq read
jmp back
parse:
jmp parse
jsr clr_sbuf
rts
forg:
iny
lda str_buf, y
jsr iswhite
bcs forg
cmp
bne forg_exit
sty org
forg_end:
iny
lda str_buf, y
jsr istoken
bcs forg_end
dey
sty scr_col
forg_exit:
rts
istoken:
cmp
beq istoken_f
cmp
beq istoken_f
cmp
beq istoken_f
cmp
beq istoken_f
cmp
beq istoken_f
sec
rts
istoken_f
clc
rts
iswhite:
cmp
beq iswhite_t
cmp
beq iswhite_t
clc
rts
iswhite_t:
sec
rts
rset_y:
ldy.w
jmp print_buf
print_buf:
lda buf, y
beq fin
sta scr
iny
jmp print_buf
spin:
nop
nop
nop
jmp spin
clr_buf:
lda
cpy.w
beq clr_end
sta buf, y
iny
jmp clr_buf
clr_sbuf:
lda
cpy.w
beq clr_end
sta str_buf, y
iny
jmp clr_sbuf
clr_end:
rts
echo:
sta a
ldx scr_col
cpx
bne echo_print
cmp
beq linewrap
linewrap:
inc scr_row
ldx
stx scr_col
jsr update_pos
echo_print:
lda a
sta scr
inc scr_col
sta str_buf, y
iny
rts
.org $FFC0
.qword reset
.org $FF50
.qword spin
.qword spin
.qword spin
.qword spin
.qword spin
.qword spin
.qword spin
.org $FFA0
.qword irq_routine
done
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