Radio Shack TRS-80 PC-3 Owner's Manual page 88

ME RG E Combines a program on tape with one al ready in memory.
PRINT# Saves the contents of variables on tape.
INPUT# Retrieves the contents of variables from tape.
CHAIN Starts execution of a program which has been stored on tape.
Programs may be assigned filenames which will be stored on the tape. This allows the unambigous storage of many programs on
one tape. Programs can then be retrieved by name and the tape will be searched to find the appropriate file. If programs have
been password-protected in memory, they cannot be stored on tape, but a password can be assigned at the time that unprotected
programs are CSAVEd. Such password-protected programs can be used by other person, but they will not be able to LIST or
modify the programs in any way.
See Chapter 8 for details on all these verbs and commands.
When a program or data is recorded on tape, it will be preceded by a high-pitched tone of approximately 7 seconds. This tone
serves to advance the tape past any leader and to identify the beginning of each program or set of data.
NOTE: Whenever you wish to read in something from tape, it is essential that the tape be positioned on one of these leader
tone areas.
When searching for a filename, the tape can read only in a forward direction. This search is relatively slow, so it is sometimes
preferable to keep track of program locations by using tape counter. Using fast forward, rewind or play, the tape can be manually
positioned to the leader tone area of the correct program before the retrieval is started. While scanning the tapes, you will be
able to hear the high tones which begin each program. In between these high tones will be a mixed high and low tone sound which
indicates programs or data.
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