Radio Shack TRS-80 Model 100 Basic Manual page 32

The program will now be saved in RAM in "ASCII" format, rather than the usual
"compressed" format. This means that the program will be saved exactly as it was
written. Ordinarily, programs are saved in compressed form. In compressed form, key
words such as PRINT, are replaced by a single character to conserve storage space.
Type the following command:
SAVE "PROG2" tA (ENTER)
The "A" following the name indicates that the program is to be saved in ASCll
mode.
Another way of saving a program in ASCII format, is to use the extension .DO as part
of the SAVE command. For example, to SAVE PROG2 in this way you could type:
SAVE "PROG2.00"
CEJIIER)
Delete the program from working memory with the NEW command.
Confirm that it has been saved in RAM with the FILES command.
PROG2 will be listed as:
PROG2.00
The extension "DO" (for DOcument) will be attached to any BASIC program saved
with the ASCII option. There are several reasons why you might want to save a file in
the ASCII format. As it will be illustrated later in this experiment, merging files is
one of the main ones.
Delete the program from working memory with the NEW command, and type the
following one line program.
S PR I NT "HELLO MODEL 100 USER" (ENTER)
Merge PROG2, which is saved in RAM with the ASCII option, with this one line
program, by typing the command:
MERGE "PROG2" (ENTER)
List the program in working memory to confirm that it is
S PRINT "HELLO MODEL 100 USER"
10 PRINT "THIS IS A TEST"
20 PRINT "OF THE MODEL 100 COMPUTER"
30 PRINT "AND ITS ABILITY TO STORE FILES"
Merging a program in working memory with one that has been saved in RAM, can
only be done if the program in RAM was saved with the A (ASCll) option.
Delete lines 20 and 30 by entering just the line numbers and then rewrite line 10 as
follows:
10 PR I NT "HERE I S A MESSAGE FOR YOU" (ENTER)
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