IBM Series 1 - Page 22

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Interru~! Subset
The interrupt subset consists of control busses and tags to
support an interrupting source on the I/O channel. This
subset pro vides the means to present interrupt requests to
the processor, to resolve contention, to acknowledge an
interrupt, and to accept an interrupt.
In conjunction with the basic subset, the interrupt
subset supports DPC devices that are interrupting sources.
The I/O signal lines in the interrupt subset are listed in
Figure 2-4.
Figure 2-4 (Part 1 of 2).
Int~~E! ~ubsei--~ervi£g Q!Q~£ Q1 Signal Lin~2
Sigqal __ n~a~m~e~ ____ __
Service gate
Service gate return
------.>
(------
Figure 2-4 (Part 2 of 2).
!nt~£Y£1 Subset--Po!! GroYE Q! ~ig~! 1ine~
,
1
Signal name No. of lines
Request in bus
Poll identifier
Poll
Poll prime
Poll propagate
Poll return
(------
------)
------)
--_._-->
------)
<--_._--
16
5
1
1
1
1
Processor I/O Channel 2-7