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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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Error and Status ConditionsErrors detected by <strong>the</strong> disk storage module are indicated to <strong>the</strong> controlling program by acondition code and by status words. Status words also indicate general operating conditionsof <strong>the</strong> disk storage module. Figure 15-7 summarizes <strong>the</strong> definitions of bits in <strong>the</strong> ISW andISWEX.Interrupt status word extension (ISWEX)Diagnostic positionFile data unsafe*Missing address mark*Equipment check*Seek check*File data check*u ead settling timeAddress mark timePre-ID timeBit ring zeroWrite data to fileCC register position 17Bit ring inhibitIndex time 4Data buffer busyIndex sensedIPL select lower*The summary status indicator is also set when <strong>the</strong> resulting interruption request is presented.Note. ISW bits 6, 8, 9, 11, and 14 are used only with <strong>the</strong> CS feature. ISW bit 7 is used only with DPC.Figure 15 -7. Summary of bits in ISW and ISWEX

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