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Register parameters

RST 20H, DEFW $7409
     HL = dividend
     DE = divisor

OUT, if call successful:
     Fc = 0
     HL = quotient
     DE = remainder

OUT, if call failed:
     Fc = 1
     A = error code:
          RC_FAIL ($16), division by zero attempted

Registers changed after return:
     ..BC..../IXIY same
     AF..DEHL/.... different 

Related calls

GN_Gdn, convert an ASCII string to a binary number
GN_M16, 16bit unsigned multiplication
GN_D24, 24bit unsigned division
GN_M24, 24bit unsigned multiplication
GN_Pdn, write number as decimal ASCII string

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