every 16 lines of output.
when the first
of the virtual spool buffer takes the
checkpoint (DMKCKP) to recover the active spool file in the event of
a shutdown because of system failure. If data in the virtual buffer
has not yet been written to the spool device, it will not be
where they are first queued.
A virtual system reset, device reset, or IPL
virtual console spool file. The
console commands does close the virtual console spool file. The
the
operator, the console spool file for both the user and operator is
closed.
The inclusion of the spool file tag record in a virtual console spool
file is processed
files in
attached to the
reader spool files and user output spool files onto the real printers
and punches. The executive opti.izes the use of
processor rather than running the system unit record devices at their
rated speeds.
except for a
output devices tend to run in bursts. However, command chaining is used
for all unit record channel programs so that the devices are running at
their .aximum
Both the input and output operations of
Thus,
generated not-ready to ready device end interruption occurs. External
interruptions are generated by the hardware in the nor.al
internal, "pseudo interruptions," are generated by the software when an
output file has been queued on the real printer or punch file chain, or
when the operator issues a
.atches that of the device that was
for a
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