downhl inc h
ld a,h
and 7
ret nz
ld a,l
add a,#20
ld l,a
ret c
ld a,h
sub 8
ld h,a
ret
----
Slower alternative:
downhl inc h
ld a,h
and 7
ret nz
ld a,l
add a,32
ld l,a
ld a,h
jr c,downhl2
sub 8
ld h,a
downhl2 cp 88
ret c
ld h,64
ret
----
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