Radio Shack TRS-80 PC-3 Owner's Manual page 114

1 PASS "character string"
Abbreviations: none
See also: CSAVE, CLOAD
Purpose
The PASS command is used to set and cancel passwords.
Use
Passwords are used to protect programs from inspection or modification by other users. A password consists of a character string
which is no more than seven characters long. The seven characters must be alphabetic or one of the following special symbols:
!"#$%&(
l*+-I,.:;<=>?@Y1r
A
Once a PASS command has been given, the programs in memory are protected. A password-protected program cannot be examined
or modified in memory. It cannot be output to tape or listed with LIST or LLlST, nor is it possible to add or delete program lines.
If several programs are in memory and PASS is entered, all programs in memory are protected. If a non-password-protected
program is merged with a protected program, the merged program is protected. The only way to remove this protection is to
execute another PASS statement with the same password or to enter NEW (which erases the programs).
Examples
PASS "SECRET"
Establishes the password 'SECRET' for all programs in memory.
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