Type III C lass A Program

SPOOL
Purpose:
The SPOOL console function allows the user to direct his
spooled output to a specific unit record device at the
computing facility and to control the nature of reading
spooled input files.
Format:
SPOOL
SP
xxx
ccc
xxx is the virtual device address from which output is to be
directed to the specific real device" yyy.
yyy is the real device address of the desired output unit.
It can only be a printer or punch address.
ccc is the virtual device address of the card reader that is
to have continuous spooled input.
Usage:
When printing or punching files from virtual devices, the
output is written to disk or ·spooled"" until the physical
device is available for use. If there are multiple printers
or punches, the first available device is used for the
output. To control the spooled output direction, SPOOL can
be issued specifying the virtual device address and the real
device to which the output should go.. The virtual and real
device types must be the same; in other words the virtual
punch cannot be directed to the real printer.
To discontinue the directed spooling and return to normal
spooling, issue SPOOL, specifying the virtual device address
and OFF.
SPOOL also controls the virtual card reading
characteristics. When multiple physical card decks have
been spooled onto dis_k by CP, a user must close each file
before the next file can be read. For continuous virtual
card reader input such that the card reader does not have to
be closed between each file, the SPOOL command can be issued
specifying the virtual card reader address and CONT,. The
virtual machine receives an end-of-file indication only
after the last card of the last spooled input file has been
read.
To terminate the continuous reading of files, issue SPOOL,
SPOOL 499