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|
; awfully slow.. be patient
init:
ldx #0
stx $0
inx
stx $2
stx $3
inx
stx $1
loop:
lda $2
cmp #$20
bne notIncF2
inc $3
lda #0
sta $2
notIncF2:
inc $2
; CALCULATE START
lda $2
sta $f1
lda $2
sta $f2
jsr multiply
lda $f4
sta $f8
lda $3
sta $f1
lda $3
sta $f2
jsr multiply
; CALCULATE STOP
lda $f4
clc
adc $f8
lsr
lsr
lsr
lsr
lsr
ldx #0
sta ($0,x)
inc $0
lda $0
cmp #$00
bne notNextY
inc $1
lda $1
cmp #6
beq exit
notNextY:
jmp loop
exit:
rts
multiply:
lda #0
sta $f4
sta $f5
ldx #8
a:asl $f4
rol $f5
asl $f2
bcc b
clc
lda $f4
adc $f1
sta $f4
bcc b
inc $f5
b:dex
bne a
rts
|
