Tandy 1000 Basic Reference Manual

Chapter 10 I BASIC Keywords
Sample Programs
MERGE provides a convenient means of putting program mod-
ules together. For example, an often-used set
of BASIC subrou-
tines can accompany a variety
of programs with this command.
Suppose the following program
is in memory:
80 REM MAIN PROGRAM
90 REM LINE NUMBER RESERVED FOR SUBROUTINE HOOK
100 REM PROGRAM LINE
110 REM PROGRAM LINE
120 REM PROGRAM LINE
130 END
And suppose the following subroutine, sub.txt, is stored on disk
in ASCII format:
90 GOSUB 1000 'SUBROUTINE HOOK
1000 REM BEGINNING OF SUBROUTINE
1010 REM SUBROUTINE LINE
1020 REM SUBROUTINE LINE
1030 REM SUBROUTINE LINE
1040 RETURN
You can MERGE the subroutine with the main program with:
MERGE "5ub. txt"
The new program in memory is:
80 REM
90 GOSUB 1000
100 REM
110 REM
120 REM
130 END
1000 REM
1010 REM
1020 REM
1030 REM
1040 RETURN
MAIN PROGRAM
'SUBROUTINE HOOK
PROGRAM LINE
PROGRAM LINE
PROGRAM LINE
BEGINNING OF SUBROUTINE
SUBROUTINE LINE
SUBROUTINE LINE
SUBROUTINE LINE
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200