Examples 6.15.4 Binary 8-bit subtractor Caution: Z3 becomes negative and is filed as two’s complement if Z2 > Z1. Further evaluation of Z3 has to take this into account. Z1: minuend 8 bit 0-255 ($FF) BM00.00 Z2: subtrahend 8 bit 0-255 ($FF) BM00.01 Z3: difference 8 bit 0-255 ($FF) BM00.02 Z1 BM00.01 Z2 Z3 BM00.02 Binary subtractor Programm L BM00.00 ;Z1 minuend SUB BM00.02 ;Z2 Ssbtrahend = BM00.04 ;Z3 difference 133