Radio Shack TRS-80 Model 100 Basic Manual page 27

PROGI should still be in working memory. Use the LIST command to confirm that it
is. It should appear as:
LIST
10 PRINT "THIS IS A TEST"
PRINT "OF THE MODEL 100 COMPUTER"
PRINT "AND ITS ABILITY TO STORE FILES
If it is not in memory you should LOAD it from RAM or type it in as shown above.
To save a program on cassette, it is first necessary to connect the Model 100 to a
suitable cassette recorder. For optimum results we recommend the Radio Shack
CCR-81 Computer Recorder (catalog number 26-1208) with connecting cable and
instructions supplied. Be sure that the proper connections are made before proceeding
further.
Place a blank tape in the cassette recorder and rewind it, if necessary. Then advance
the tape past the leader. (If you use Radio Shack Leaderless cassettes, catalog number
26-3019, this isn't necessary.)
Press the RECORD (red key) and PLAY keys down together. They should stay down,
but the tape will not move. If it does, you do not have the remote jack inserted. Insert
the jack.
Now you are ready to save the program onto the tape. Enter the following command:
CSAVE "PROG1"
The recorder will run briefly and then stop. The RECORD and PLAY keys, however,
will stay down. After the tape stops, you may press the STOP key and rewind the
tape.
The program now has been saved with the filename .'PROG1. "
Another way to save the program on tape, instead of using CSAVE "PROG1" is to
use the command:
SAlJE "CAS : filename
II
where CAS: specifies the device to be used for the saving operation, in this case the
cassette recorder, and filename is the name of the program to be saved. Using this
command, you would specify:
SAIJE "CAS: PROG 1"
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