I
3. Turns
off
I/O
clear
signal.
4.
Loads
memory
via
MCU
channel.
5. Turns
off
master
clear
signal.
The
master
clear
signal stops
all
internal
computation
and
forces the
critical
control
latches
to predetermined
states.
The
I/O
clear
signal
clears
the input channel address
register
of the channel connected to the
MCU
and
activates
the input channel conected
to
the
MCU
subsystem.
All
other input channels remain
inactive.
The
maintenance control
unit
then
loads
an
initial
exchange package
and
monitor program.
The
exchange
package
must
be
located
at
address zero in
memory.
Turning
off
the master
clear
signal
initiates
the exchange sequence to read
this
package
and
to
begin execution of the monitor program. Subsequent actions are
dictated
by
the design of the operating system.
2240004
3-48
E
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