Control Data 3234 Series Hardware Reference Manual page 31

SELECT INTERRUPT ON READY AND NOT BUSY (0020)
The select interrupt on ready and not busy code activates the interrupt line the next
time the subsystem becomes ready and not busy (at the end of the next operation).
RELEASE INTERRUPT ON READY AND NOT BUSY (0021)
The release interrupt on ready and not busy code removes the associated interrupt
selection set up by the 0020 code. No interrupt notification of ready and not busy is
sent until the condition is res elected.
SELECT INTERRUPT ON END OF OPERATION (0022)
The select interrupt on end of operation code causes the 'interrupt line to be activated
and the associated status bit to be set on completion of the next operation whether the
end of operation is normal
Or
abnormal.
The following conditions cause an interrupt on end of operation.
1.
At the end of the sector in which a read or write operation ended
2. When the channel goes inactive at the end of a return address operation
3. After a seek command is sent to the storage unit on a load address operation
RELEASE INTERRUPT ON END OF OPERATION (0023)
The release interrupt on end of operation code removes the associated interrupt selection
set up by the 0022 code. No interrupt indication of end of operation is sent until the
condition is res elected.
SELECT INTERRUPT ON ABNORMAL END OF OPERATION (0024)
The select interrupt on abnormal end of operation code causes the interrupt line to be
activated and the associated status bit to be set on the stopping of an operation because
of any abnormal condition within the controller or selected storage unit.
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