IBM 5280 Distributed Data System - Index of

Hex Length inDisplace- Bytes (inment Hex) Description00B8 4 Communications lOB Pointer:Byte 0Bit(s)Meaning0 The CAM has locked the lOB pointer; themain microprocessor cannot use the lOB ifthis bit is 1.1-3 System use only.4-7 If not 0000, the main microprocessor isaccessing the chain.Byte 1The high-order address of the first lOB onthe chain.Byte 2Bit(s)Meaning0 The low-order lOB address.1-2 System use only.3 l=CAM is optional.4-7 The page number of the lOB location.Byte 3Hex F F if the CAM is operational.OOBC 4 System use only.OOCO 5 Date information as follows:Byte 0 Year minus 1900.Bytes 1-2Day of the year.Byte 3 Month (date is invalid if this byte = 00).Byte 4Day of the month.00C5 2 Storage size as follows:Byte 0Byte 1Number of 64 K -byte pages of storage.Number of 256-byte blocks of storage on thelast page.00C7IPL Flag.Main Storage Data Areas 31