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millfork/examples/a8/endless_scroll.mfk
2020-09-08 00:17:10 +02:00

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1.2 KiB
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const word dlAddr = $3000
const word lms1Addr = $4000
const word lms2Addr = $4060
const word lms3Addr = $40c0
volatile word SDLST @ $230
array(byte) dl @ dlAddr = [
$70,$70,$70,
$52,lo(lms1Addr),hi(lms1Addr),
$52,lo(lms2Addr),hi(lms2Addr),
$52,lo(lms3Addr),hi(lms3Addr),
$41,lo(dlAddr),hi(dlAddr)
]
noinline asm void wait(byte register(a) f) {
clc
adc os_RTCLOK+2
rt_check:
cmp os_RTCLOK+2
bne rt_check
rts
}
void main() {
word lms1 @ dlAddr + 4
word lms2 @ dlAddr + 7
word lms3 @ dlAddr + 10
byte hscroli @ $80, a, b, c
pointer screeni @ $82
hscroli = $f
screeni = lms1Addr
wait(1)
SDLST = dl.addr
while true {
if hscroli == $b {
a = (pokey_random & 15) + 33
b = (pokey_random & 15) + 33
c = (pokey_random & 15) + 33
screeni[0] = a
screeni[$60] = b
screeni[$c0] = c
screeni[$30] = a
screeni[$30 + $60] = b
screeni[$30 + $c0] = c
lms1 += 1
lms2 += 1
lms3 += 1
screeni += 1
if lms1 == lms1Addr + $30 {
lms1 = lms1Addr
lms2 = lms2Addr
lms3 = lms3Addr
screeni = lms1Addr
}
hscroli = $f
}
antic_hscrol = hscroli
hscroli -= 1
wait(1)
}
}