IBM System/360

1442 CARD READ PUNCH
Commands
Command
Read
Write
Control
Test I/O
Sense
No-Op
Punch Diag
Read Diag
Modifiers
Eject
Select Stacker 2
Card Image
x is "don
1
t caren bit
Status Byte
Bit
3
4
5
Name
Busy
Channel End
Device End
0
x
0
x
x
Bit
1
2
3 I
4
x x x
x x x
x x x x
0 0 0 0
x
0 0
0
x x x x
x
1 1
x 0
1
0
1
x x
x x
x x x
Description
Unit Check -·- further explained by sense byte
0
0
0
0
Unit Exception - - EO F and last card has been read
Sense Byte
Bit
0
2
Name
Description
Command Reject
Intervention Required -- not ready
Bus-Out Check
0
0
0
Equipment Check -- reader check, punch check,
invalid card code punched and
data error on CE read or write.
4 Data Check -- invalid card code on read
Overrun Check
IBM CONFIDENTIAL
S/360 71