Tandy 1000 Basic Reference Manual

Chapter 10 I BASIC Keywords
COMMON
Statement
COMMON uariabZe[,uariabZe,. . .I
Passes Variables to a chained program.
Both programs in the chain should contain a COMMON state-
ment. COMMON may appear anywhere in a program, but we
recommend using
it at the beginning.
The same variable cannot appear in more than one COMMON
statement in
a single program. The size and order of the vari-
ables must be the same in the programs being chained. To spec-
ify array variables, append
“0” to the variable name. If you are
passing all variables, use CHAIN with the ALL option and omit
the COMMON statement.
Note: Array variables used in a COMMON statement
must have been declared in a DIM statement.
See the CHAIN statement for more information on passing
variables.
Example
90 DIM D(50)
100
COMMON A, E, C, DO,G$
11 0 CHFI IN ”PROG3”, 10
Line 100 passes variables A, B, C, D, and G$ to the CHAIN
command in Line 110.
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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