st ix, [j]
ld ix, [j]
ld acc, [ix+a0+1]
st acc, [x]

lp2: ld acc, [x]
ld ix, [j]
ld ix, [ix+a0]
cmp acc, ix
bzp lp4
ld ix, [j]
ld acc, [ix+a0]
st acc, [ix+a0+1]

lp3: ld ix, [j]
sub ix, 1
st ix, [j]
bzp lp2

lp4: ld acc, [x]
ld ix, [j]
st acc, [ix+a0+1]