IBM 5280 Distributed Data System - Index of

Binary Register Subtract with a Displacement Address (-=)Source:BRa -= dis~n, BRb(4))Object:I B2 I~ p~ ~ I0 8 15 I 23 J 31liB 1111IID Result/factor 1: The address of the binary register that contains factor 1and will contain the result of this instruction.D Bit 15:o = Length of factor 2 is 2.1 = Length of factor 2 is 1.II Base address register: The address of the binary register that contains thebase address.II Address bit:0= BRa contains a 16-bit address.1 = B Ra(4) contains a 20-bit address of a storage location outside thepartition.II Displacement: The number of bytes (hex OO-FF) from the base address wherefactor 2 is stored.Factor 2 is subtracted from factor 1, and the result is placed in the factor 1 register.Object Code Instruction Format 259