Oki 182 Handbook page 52

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ML182/183 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
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Computers cannot understand letters. They use only numbers, more
specifically, binary numbers
(1
s and as). When carrying out an
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LPRINT command, the computer s.ends the printer a code number
for each character (letter, symbol, punctuation mark) within the
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quotation marks. As the printer receives each number, it prints the
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dot pattern associated with that number.
The American Standard Code for Information Interchange (before
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known as ASCII) is the standard code used by computers. Appendix
D gives the ASCII code numbers along with their hexadecimal,
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binary, and decimal equivalents. You can enter these ASCII numbers
directly in your LPRINT statement by using the CHR$ (Character
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Stri ng) function.
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The CHR$ command sends the ASCII command in parentheses to
the printer. For example, we can write a program this way:
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LPRLI;:-lT· CHR$(79);CH R$(75);CHR$(73);CHR$ (68);CHR$(65);
CHJ!$<84);
OtfR$
(65) . ;,:::",;'.. . . .
,)h
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This is obviously a tedious way to write, but you need to understand
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the concept when you want to use certain commands.
Keep in mind that there is a big difference between ASCII code
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numbers and numbers that are printable characters. For example, if
you want to print the number
1
using an LPRINT statement, you
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would type this:
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LPRJ,,Il>jTCHR$(49)
You can also print numbers and symbols by putting them within
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quotes, like this:
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[PRINT"1 "
So far, we have discussed printable characters, ASCII codes located
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between decimal 32 and decimal 127. Non-printable codes, located
between a and 31, do not tell the printer to print something. They
instruct the printer how to print something. The ASCII chart in the
back of this handbook shows that these codes have abbreviations,
such as FF and US. Some of these abbreviations make sense (FF, for
instance, stands for form feed) but others do not unless you are a
telecommunications expert.
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