IBM Series 1 User Manual page 18
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FUNCTIONAL DESCRIPTION OF THE I/O
CHANNEL
SIGNAL LINES
The
I/O
channel consists of
81
signal lines.
These signal
lines are divided into two physical groups:
(1)
the
.§~llic~
g£Q~
and
(2)
the
Eol!
g£QYE.
Eaen
group can operate
concurrently
and
asynchronously
with
the
other
group.
However,
the
initiation
of
sequences
on
the channel is
interdependent.
The service group supports:
•
Data and control information transfers
•
1PL
initiation
•
Reset functions
The poll group supports:
•
Cycle steal requests from the devices
•
Interrupt requests from the devices
•
Acknovlegement of both types of requests
The
I/O
channel signal lines are listed
by
group in Figures
2-1
and
2-2.
!Q!~.
The
direction shown for each line assumes that the
I/O
channel
originates
on the left; I/O attachments are on the
right.
The
signal
lines
associated
with
the
service group are
listed in Figure 2-1.
Processor I/O Channel
2-3
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