downde inc d ld a,d and 7 ret nz ld a,e add a,#20 ld e,a ret c ld a,d sub 8 ld d,a ret
Slower alternative:
downde inc d ld a,d and 7 ret nz ld a,e add a,32 ld e,a ld a,d jr c,downde2 sub 8 ld d,a downde2 cp 88 ret c ld d,64 ret
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