IBM 5280 Distributed Data System - Index of

Byte GroupsEnd Flag and DisplacementOne or three bytes specify the displacement from the rightmost position of theprevious field to the rightmost position of the current field. The displacement bytealso contains a flag that indicates the end of the format control string series. If thedisplacement is less than 32, 1 byte contains the displacement and the end flag. Ifthe displacement is greater than or equal to 32, 3 bytes are used: the first 2 bytesspecify the displacement, and the third byte contains the end flag.DisplacementByte 1IIICDrThese bytes are used only if thedisplacement is 32 or more.I I I I IOlo.Olololololo Displacement Length:0= Displacement is less than 32; displacement value is specified by bits 3 to 7of this byte.1 = Displacement is 32 or greater; displacement value is specified by bits 3 to 7of this byte and bits 0 to 7 of the next byte. A third byte is used for theend flag.e Displacement direction:0= Forward displacement.1 = Backward displacement.e End flag: 1 = last in this series.CDGDisplacement: If bit 0 of this byte is 0, this is the displacement. If bit 0 of thisbyte is 1, this is the high-order 5 bits of the displacement.Displacement Byte 2: The low-order 8 bits of a displacement of 32 or more.o End Flag:o = Not last in series.1 = Last in this series.Main Storage Data Areas 113