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Read in by Problem
Program
DATA
PROBLEM
PROGRAM
Read in Manually by
Operator
Figure 1-26.
Sample Control Program
6.
7.
The control program would then load
in the next problem program and
pass control to it.
This operation would continue until
all problem programs had been exe-
cuted.
Notice several things about the use of a
control program in the above example:
1.
The system never halted between
jobs.
2.
The control program remained in
3.
main storage as the problem pro-
grams were executed.
The control program served only as
a linkage between jobs.
Its only
fUnction was to bring in a new
problem program as each job was
finished.
In the simplest use of
program, it was used only
the next problem program.
programs handled their own
operations (Figure 1-27).
the control
to bring in
The problem
input-output
MAIN STORAGE
Control _ _
-+-
Dato
»
Read
----
Write
---
CONTROL
PROGRAM
PROBLEM
PROGRAM
C t I P
Rd Prog. A
Rd Prog. B
on ro
rog.
S
1
t
It... _ _ _
.....I
t
Problem Prog.
• , ... - - - - -..
Prog. A Executed
Prog. B Executed
Figure 1-27.
Basic Control Program
Rd Prog. C
5
1-51
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