Sharp PC-1500A Instruction Manual page 114

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5. Use of the
MERGE
Command
The MERGE command allows you to store many programs in the computer memo ry at the
same time. For example, let's as.sume the computer memory contains the following program :
10: PRINT "DEPRECIATION ALLOWANCE"
20: INPUT "Enter method : " ; A
At this point you r· c mcrnber that you have a similar
prooram
portion on tape undier the filcnomc
"DEPl"'. You will, of course, want to see if this program has sections useful in the program you
are currently constructing. The first step is to find the tape with " DEPl" on it. Cue the tape to
the place at whicll ' ' DEP 1 "starts.
Now type: MERGE "DEPI " and press lunu l
The computer will now load "DEPl " into memory IN ADDITION to the above program. After
"DE Pl
"is loaded. you might find something in memory similar to
this:
10: PR INT "DEPREC IATION ALLOWAN CE"
20: INPUT "Enter method: "; A
10: "DEP1" : REM > > Second Module <<
20: PRINT " INTEREST CHARGES"
30: INPUT " Amount Borrowed : "; B
{etc)
Note that unlike the CLOAD command, the new program DID NOT replace the existing one and
that some line numbers have been duplicated . Also note thot a " label" was used on thc first line
of the merged module. This allows "LINKING"
of
the modules to(lether (See LI NKING MERGED
MODULES - below).
It
is important
that you review the following information before proceeding
\Vi
th any further
editing or programing:
IMPORTANT NOTES:
Once
a
MERGE is performed, no INSERTIONS. DELETIONS, or CHANGES are allowed to
previously existing program lines.
Example :
f1o
"A" REM This is existing program
I
20
FORT " 1to100
30 LPRINT T
40 NEXT T
(Etc)
BEFORE doing a MERGE of the next program, make any necessary changes to
this
program.
Then MERGE the next program: MERGE "PROG2" (example)
10 "B" REM This
is
MERGED program
20 INPUT "Enter depreciation : " ; D
30 INPUT " Number of Years: "; Y
40 . Etc.
Now you may make changes to the above program since it was the last MERGED portion . . If you
need
10
make further changes to the first program
~hen
follow this procedure:
112
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