Radio Shack TRS-80 PC-3 Owner's Manual page 75

Notice that the" A" appears in the display at the left followed by a colon.
Enter the word 'PRINT' and press the (ENTER) key.
Display
PRINT
(ENTER)
A: PRINT
A space appears after the colon signalling you that 'PRINT' is now stored in the reserve memory under the letter A.
Switch the PC·3 into PROgram mode. Type NEW followed by (ENTER) to clear the program memory. Type '10' as a line number
and then press (SHIFT) and the 'A' key:
Display
10
(SHIFT) A
10 PRINT_
10: PRINT
Immediately the word "PRINT" will appear in the display after the line number.
Any character sequence can be stored in ReSerVe Memory. The stored strings can be recalled at any time in either the program
or the R UN mode by typing (SHIFT)and the key that the string is stored under. The keys available are the same as those used with
DEF, i.e., those in the dark area of the keyboard.
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