IBM 5280 Distributed Data System - Index of

HexDisplace-mentLength inBytes (inDescriptionOOC8 2OOCA 60000 8High-order 2 bytes of time (1.6 seconds per count) since thesystem was powered on (if the elapsed time counter isinstalled). Updated by the keyboard/display microprocessor.System use only.System flags as follows:Byte 0Bit(s)0-345-7Byte 1Byte 2Byte 3Bytes 4-5MeaningSystem use only.The resource allocation table is in storage.System use only.During IPL, hexadecimal FF indicates themain microprocessor is ready for IPL data tobe loaded. Not hexadecimal FF indicatesthat a diskette microprocessor is loading IPLdata.The device address of the IPL diskette.The IPL device subaddress.System use only.0006 20008 BOOE3 7The address of the resource allocation table, relative to thebeginning of page O.System use only.Error log lockout bytes: Each device lOB pointer isassigned a bit in the first-level lockout bytes. Up to 8 devicelOB pointers share a bit in the second-level lockout byte.For entry to the error log, all bits in the first-level byte containingthe device lOB pointer lockout bit must be 0, and allbits in the second-level lockout byte must be O. To use thetable, the microprocessor must: (1) Set the bit in the firstlevellockout byte corresponding to the lOB pointer of thedevice that has the error. All other bits in that byte mustbe O. (2) Set the bit in the second-level lockout byte. Allother bits in that byte must be O. (3) Set bits 4-7 of byte 1of the pointer to system table 0 to hex FF. This half-bytemust have been zero.32