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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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Interrupt PresentationsInterrupts occur on level 1 sublevel 1 or level 3 sublevel 1. The level at which aninterrupt occurs is determined by wiring in <strong>the</strong> <strong>System</strong>/7 when <strong>the</strong> 5024 is installed.This makes <strong>the</strong> interrupt structure non-programmable and eliminates <strong>the</strong> use of a prepareI/O instruction. When an interrupt is accepted, <strong>the</strong> accumulator will have <strong>the</strong>following configuration:0 4 10 15Sublevel DA MA0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 01 1 1 11111 111111 7 0 0I/O CommandThe 5024 uses two operations of <strong>the</strong> set interrupt command. They are:1. Initiate I/O.2. Reset 5024.Initiate I/OInitiate I/O starts <strong>the</strong> cycle steal of <strong>the</strong> IOTB by <strong>the</strong> controller. An interrupt is generatedafter <strong>the</strong> cycle steal operation is completed. If <strong>the</strong> module address (MA) is not zero aprogram check occurs. The initiate I/O has <strong>the</strong> following format:0 4 815MA0 0 0 0 0 0111110 0 0 0,0 0 0 0,0 0 0 0,0 0 0 111111111111111s■•■•••••,/.......••■■•••••••IVV....,■■•,0 0 0 1Contents of registerspecified in reg field<strong>IBM</strong> 5024 I/0 Attachment Enclosure 17-7

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