IBM 2025 Maintenance Manual page 28

Chnl Status
Flags & Op
0 - Secondary Bit
1 - Incorrect Length
2 - Program Check
3 -- Protection Check
4 - Not Used
6- Not Used
6 - Interface Check
7 - Int. In Int Buffer Bit
.J>.fila...f..9..dWL _
Unit Status at Count Field Next CCW Address
Interrupt Time
0 - Chain-Data (CD) Flag
1 - Chain-Command (CC) Flag
2 - Suppress-Length-Indication (SLI) Flag
3 - Skip Flag
4 - Program-Controlled-Interruption (PCI) Flag
6 - Active Bit
6-0p
o*
7 -Op 1*
*With Active Bit= 1, Op-0 & Op-1 Decode as follows:
00 - Count Zero Expecting Channel End
01 - Output
10 - Read Forward
11 - Read Backward
Figure 1-22. 2540
Reader-ucw Forreat
Chnl Status Flags & Op
Data Address
-units'tat"Us
'it -
Interrupt Time
Count Field Next CCW Address
0 - Secondary Bit
1 - Incorrect Length
2 -
Program Check
!3 -
Protection Check
4-Not
Used
6 - Not Used
6 - Interface Check
7 - Int. In Int. Buffer Bit
0 - Chain-Data (CD) Flag
1 - Chain-Command (CC) Flag
2 - Suppress-Length-Indication (SLI) Flag
3-Skip Flag
4 - Program-Controlled-Interruption (PCI) Flag
5 -Active Bit
6-0P O*
7 - OP 1*
*With Active Bit-1, OP-0 & OP-1 Decode as Follows:
00 - Count Zero Expecting Channel End
01 -Output
10 - Read Forward
11 - Read Backward
Figure 1-23. 2540 Punch-UCW
Format
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