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IBM System/7 Functional Characteristics - All about the IBM 1130 ...

IBM System/7 Functional Characteristics - All about the IBM 1130 ...

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• Output Diagnostic/Initialize Controller 0101. This command is used to initialize <strong>the</strong>5024 controller using data tables. The 2502 attention interrupt must be disabled priorto issuing this command. For fur<strong>the</strong>r definition of 5024 controller initialization seeController Initialization in this chapter.• Enable Attention Interrupt 0111. This command will enable <strong>the</strong> 2502Attention Interrupt.2502 Status AddressThis word contains a user defined storage address of <strong>the</strong> status buffer.Word CountThe controller establishes <strong>the</strong> word count for all <strong>the</strong> 2502 commands.Data AddressThe data address is <strong>the</strong> address of <strong>the</strong> buffer in <strong>the</strong> <strong>System</strong>/7 into which data istransferred. This parameter is fetched by <strong>the</strong> controller which holds it in a register,updates it, and presents it during status transfer.Status BufferBefore <strong>the</strong> 2502 attachment presents an interrupt request, 5 control words are placed in<strong>System</strong>/7 storage for program interrogation.0 Status buffer 15NStatus word 1N+1 Status word 2Not stored for an attention interruptN+2 Residual addressN+3 Normal interrupt indicatorIN+4 Attention interrupt indicatorNot stored for a normal interruptN is <strong>the</strong> address contained in <strong>the</strong> 2502 status word address of <strong>the</strong> IOTB.<strong>IBM</strong> 5024 I/O Attachment Enclosure 17-11

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