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GB~Channel
conditions Register
0
Data Chain Latch
1
Channel Identification Latch
2
Burst Lat ch
3
Set Buffered Device Latch or Reset
Channel Parity-Error Latch
4
Channel Diagnostic Latch
5
Channel-1 Interruption Latch
6
Spare
7
Suppress Cut Control Latch
GD--Channel Diagnostic Register
O
Operational cut
1
Service CUt
2
Address cut
3
Command Out
4
0
5
Select out
6
0
7
suppress out
GS--channel Branch conditions
0
Oat a Chain Request I.atch
1
Buffered Device Latch
2
Burst latch
3
Channel Parity-Error Latch
4
Initial Select Ia tch
5
Channel
1
Interrupt Buff er Latch
6
Spare
7
Suppress Control latch
1-120
( 7 /69)
GT--Channel Branch conditions
0
Address In
1
Not Select In
2
Service In
3
Status In
4
Operational In
5
Not Request In
6
Channel Identification Latch
7
Channel Diagnostic Latch
Bits 0-5 of Sense Byte 1:
These bits are
common to all devices and are described in
the Systere/360 Principles of Operation,
Form A22- 6821.
1.18 SYSTEM CON'IROL PANEL
This section describes the controls and
indicators on the systerr control panel that
are unique to the Model 25 and/or
fundamental to maintenance strategy
(Figures 1-120 and 1-121).
Other controls
and functions are explained in the IBM
Systern/360 .Model 25 FETOM, Form Y24-3527.
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