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All mention of select out
assumes proper operation of
l
hold out as wel I. Thus,
select out up means select
out and hold out up, and
select out down means
either select out or hold
No
out down
Yes
/
Address-recognition
requires decoding the
entire byte, i.e.,
eight bits plus parity
All mention of select out assumes
proper operation of hold out as
well. Thus, select Out up means
select out and hold out up, and
select out down means either
select out or hold out down
Propagation of select out completes the signal
sequence for this control unit.
This propagated select out becomes select in at
the channel if no other control unit responds to
the poll or address
~~~~~~~~~~~"~~~~~
IBM CONFIDENTIAL
has service
requirements and
therefore answers
the polling
sequence
S/360
117
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