PROBLEM: Attempting to LOAD after a RESTORE of an MPE session aborts
the simulator with an "integer division by zero" exception.
OBSERVATION: Stopping the simulator during an idle MPE session,
saving the state to a file, exiting, restarting, restoring, and
attempting to perform a cold load aborts with a "divide by 0" error.
CAUSE: The "clk_update_counter" routine in hp3000_clk.c is called as
part of the instruction postlude to update the clock's counter
register. A calculation divides the elapsed time since the last tick
by the clock unit's "wait" value. The developer's manual stated that
this field is saved and restored automatically, but this is not true.
When the simulator is restarted, the "wait" field is initially zero.
If "clk_update_counter" is called before the clock's event service
routine resets the value, the calculation will divide by zero, which
causes the abort.
RESOLUTION: Modify "clk_reg" (hp3000_clk.c) to preset the unit wait
field with the MPE clock resolution value.
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