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2821 CONTROL UNIT (Continued)
Punch
Data Mode 1 (Write)
Data Mode 2 (Write)
Write
&
Feed
&
Stacker Pl
Write & Feed & Stacker P:l
Write
&
Feed
&
Stacker RP3
Status Byte
Bit
Name
Not Used
1
Not Used
2
Not Used
Busy
4
Channel End
Device End
6
Unit Check
7
Unit Exception
Sense Byte
Bit
2
3
4
Name
Command Reject
Intervention
Required
Bus Out Parity
Equipment Check
Data Check
UCS Parity
IBM CONFIDENTIAL
Bit
z
z
z
0
1
2
z
z
z
z
z
z
z
Description
Further defined by Sense Byte
Reader--last card Read and Stacked
Printer--Channel 12 sensed--
further defined by Sense Byte
Description
Not Ready
Parity of command on Bus Out
Parity Error in Control Unit or
Device
On
Reader Invalid Card Code.
On PFR also.
Printer UCS Parity Error.
Reader 2 reids no feed.
Punch Only PFR.
Printer Channel 9.
Reader Punch--not used.
Printer--Channel 9
S/360
91
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