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ä |
Monitor
reads jobs one at a
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|
time
from the input device
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ä |
Monitor
places a job in the user
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|
program
area
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ä |
A
monitor instruction branches
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to
the start of the user program
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ä |
Execution
of user pgm
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|
continues
until:
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ä |
end-of-pgm
occurs
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ä |
error
occurs
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ä |
Causes
the CPU to fetch its
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|
next
instruction from Monitor
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ä |
OS:
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ä |
Alternates
execution between
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|
user
program and the monitor
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|
program
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ä |
Relies
on available hardware
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|
to
effectively alternate
|
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|
execution
from various parts
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of
memory
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|