IBM System/370 145 Reference Summary page 144

Byte
Bit
0
1
2
0 3
4
5
6
7
0
1
2
1
3
4
5
6
7
0
1
2
2 3
4
5
6
7
0
1
2
3 3
4
5
6
7
22,2A,
G1STAT (SX1 Only) 32,3A
Fwd= B2
t
GB2 GC631
Bkwd = B1
\
)
Buffer Ctrl Check GC513
Count Through 0 GC412
Chain Data Request GC413
GCT
Buffer Partition GC413
GS
GO
GCLO
GCL1
~
GC412
GCL2
GCL3
Channel Loaded
GB213
Interrupt Latch GB213
Poll Control GB313
Channel Primed GB211
DCC Mode
GB213
Command Retry
GB513
Gate A/Share Req*
~
Gate B/Trap Req*
GB652
*(Diag)
\
J
Channel Bus Out
~
GB082
Channel Bus Out
~
J
Selector Channel Logics
GA Pages Common to All Channels
GB and GC =Channel 1
GF and GG =Channel 2
GK and GL =Channel 3
GP and GQ = Channel 4
11.20