IBM Series 1 User Manual page 218

7.
o
c:
o
TNL: GN34-0368 to GA34-0033-0 (February 4, 1977)
If during cycle steal transfers an e~ro~ condition is
posted to the device on
the
status bus,
the
device
must
terminate further
requests and cycle steal t~ansfers,
leave the IPL tag active, and not present an end
interrupt. If, during the cycle steal requests and
transfers, a hardware failure causes a channel
time-out, the
system remains in a 'hungt
condition.
The device should leave the IPL
tag
active. Halt or
MCHK will not occur.
This
allows diagnosis of the
problem in the state in which the failure or error
occurred.
Attachment methods for devices with power supplies
external to a processor or I/O expansion card file must
be capable of executing IPL if the device is powered up
to a ready condition before or after the processor has
activated the initiate IPL tag, status bus, and first
system r~5et of a processor initiated IPL sequence.
P~ocessor I/O Channel 2-39