Type III C lass A Program

IPL
Purpose:
IPL causes the Control Program to simulate an Initial
Program Load (IPL) sequence on a specified device .• Core is
zeroed before the IPL, and all pages of the virtual machine
are freed.
Format:
IPL
I
CMS
devadd
CMS specifies that a saved copy of the Cambridge Monitor
System is to be brought into core.
devadd specifies the address of the device to be IPL'ed.
Usage:
IPL simulates the IPL button on the computer console by
zeroing core on the virtual machine and causing a record to
be read from the specified I/O device and executed.
During the login procedure of CP when the message
READY AT xx.xx.xx ON xx/xx/xx
is typed out, where xx.xx.xx is the time of day and xx/xx/xx
is the date, CP is ready to accept any console function. By
iSsuing IPL CMS or IPL 190r, the Cambridge Monitor System
(eMS> is loaded, and the CMS command environment is entered.
The IPL 190 console function loads in a copy of the nucleus
which resides on disk 190. Periodically, a copy of this
nucleus is saved by a CP utility called SAVESYS. This saves
the nucleus at a point at the end of the IPL sequence,
thereby allowing shared pages of the nucleus and faster
response time. The IPL CMS console function loads in this
saved copy of the CMS nucleus. This means that if the
nucleus on 190 has been modified s'ince the last copy was
saved, the versions referenced by IPL 190 and IPL CMS are
different.
Responses:
BAD ARGUMENT xx
An invalid device address was specified.
ERROR DURING IPL SIO
CP is unable to· load from the specified device. If the card
reader had been specified, check to see that cards had been
read into the virtual card reader by the computer operator.
IPL 481