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Some programs don’t ask you what kind of printer you have,
but instead they ask some questions about what your printer can
do. Here are the answers to the “most asked” questions. SR-lO/ 15
can do a “backspace”.
SR-lo/15 can do a “hardware form feed”.
With these questions answered, you are ready to start printing.
Read the manual that came with your commercial software to
see how to make it send information for SR-lo/15 to print. This
is all you need to know to use SR-lo/15 as a regular printer.
But SR-IO/l5 isn’t just a regular printer.
SR- lo/15
has many capabilities that your commercial software isn’t aware
of. A little later we will see what it takes to use some of SR- lo/ 15’s
advanced features with commercial software.
n First, some terminology
SR- 1 O/ 15 knows what to print because it knows how to interpret
the codes that the computer sends to it. These codes are numbers
that the computer sends to SR-10/15. Both the computer and
SR- 10/l 5 know the meaning of these codes because they are a
set of standard codes used by almost all microcomputers. This
set of codes is the American Standard Code for Information In-
terchange, which is usually referred to as ASCII (pronounced
ask-key ). There are ASCII codes for all the letters of the alphabet,
both lower case and capital, the numbers from 0 to 9, most
punctuation marks, and some (but not all) of SR-10/15’s func-
tions.
ASCII codes are referred to in several different ways, depending
on the way they are used. Some times these codes are treated
as regular numbers. For example, the letter “A” is represented
by the number 65 in ASCII. Appendix F shows all of the ASCII
codes.
In BASIC, ASCII codes are used in the CHR$ function. This
function is used to print the character that is represented by the
number in the CHR$ function. The BASIC statement PRINT
CHR$ (65) will print an “A” on the terminal.
In some other programming languages, ASCII codes are re-
ferred to by their hex value. “Hex” is short for hexadecimal which
is a base- 16 number system (our usual numbers are base- 10). Since
hex needs 16 digits, it uses the numbers 0 through 9 and then
it uses the letters A through F for digits. The ASCII code for
the letter “A” is 41 in hex.
Of course, most of the time we don’t even need to think about
this code system. Our computers are smart enough to know that
