upde ld a,d
dec d
and 7
ret nz
ld a,e
sub 32
ld e,a
ld a,d
ret c
add a,8
ld d,a
ret
----
Slower alternative:
upde ld a,d
dec d
and 7
ret nz
ld a,e
sub 32
ld e,a
ld a,d
jr c,upde2
add a,8
ld d,a
upde2 cp 64
ret nc
ld d,87
ret
----
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