DE or attention in device B,d --,d
for the addressed device B,d --,d
for another device
Interruption pend. in sub channel
1 1 1
for the addressed device
chaining terminated by
other type of termination
Interface control check
condition at the indicatcd time. A
not necessarily stored at this time.
Conditions such as channel end
the indicated time.
previously, but are made accessible to the program only at thc
indicated time. Examples of such conditions arc program check
and channel data check, which are detected while data arc
transferred, but are made available to the program only with
channel end, unless the
havc caused an interruption condition to be generated earlier.
created previously. The letter
that the status condition did not necessarily exist previously in
the form that causes the program to be alerted, and may
example, equipment malfunctioning may be detected during an
control check to be indicated; or a device such as the
condition in response ,to interrogation by an
causing status modifier, busy, and control unit end to be indi
catcd in the
data check, may generate an interruption condition.
conditions when command chaining is spccified and no unusual
conditions have bccn detected.
only by an immediate operation.
H-When an operatioll1 on the selector channel has been termi
natcd by HALT
the data-handling portion
Appendix G 155