IBM 5280 Distributed Data System - Index of

Skip if Bits are OFF (lFB OFF)Source:r[il=~=' ==[J=:=:;~4~IJ OFF 7'jstant SKIPObject: I ~5 I I I I1::.---~~I ~~~--+-I~o 8 J 15 23 / 31o 1011 IID Mask constant: A 1-byte constant that specifies the bits to test in the byteat the base displacement address.10 Base address register: The address of the single binary register (BRn), or ofthe rightmost register of a double register (BRn(4)), that contains the baseaddress.II Addressing bit:0= BRn contains a 16-bit base address.1 = BRn(4) contains a 20-bit base address.II Displacement: The number of bytes (hex OO-FF) from the base address wherethe byte to test is stored.The displacement is added to the contents of the base address register, then the onescomplement of the data at the resulting address is tested with the mask constant. Ifany of the test bits are off, the next sequential instruction is skipped.262