C_Div_D

C_Div_D:
;Inputs:
;     C is the numerator
;     D is the denominator
;Outputs:
;     A is the remainder
;     B is 0
;     C is the result of C/D
;     D,E,H,L are not changed
;
     ld b,8
     xor a
       sla c
       rla
       cp d
       jr c,$+4
         inc c
         sub d
       djnz $-8
     ret