Radio Shack TRS-80 PC-3 Owner's Manual page 120

1 CHAIN
2 CHAIN expression
3 CHAIN "filename"
4 CHAIN "filename", expression
Abbreviations: CH., CHA., CHAI.
See also: CLOAD, CSAVE, and RUN
Purpose
The CHAIN verb is used to start execution of a program which has been stored on cassette tape. It can only be used in connection
with the optional PC-3 Printer/Cassette Interface.
Use
To use the CHAIN verb, one or more programs must be stored on a cassette. Then, when the CHAIN verb is encountered in a
running program, a program is loaded from the cassette and executed.
The first form of CHAIN loads the first program stored on the tape and begins execution with the lowest line number in the
program. The effect is the same as having entered CLOAD and the RUN when in the RUN mode.
The second form of CHAIN loads the first program stored on the tape and begins execution with the line number specified by the
expression.
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