Routines
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D4F9: HL = DE * A
Used by the routine at vflip_sprite_data.
Shift and add, taking the bits of A from the top. Eight RLCAs bring A back to what it was, and BC is kept.
Input
DE the multiplicand
A the multiplier
HL on exit, the product
HL_equals_DE_x_A D4F9 PUSH BC
D4FA LD HL,$0000
D4FD LD B,$08
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