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o x 27 = o
1x 26 = 64
0x 25 = o
0
x24 = o
1X 23 = 8
0x2’ = o
1x21 = 2
0x 2° = Q
74 Decimal
zone digits
0100 1010 Binary
4 A Hexadecimal
The ASCIItable in the TechnicalSupplementshowsall theseequivalent
~presentationsfor the symbolsyour laser printerunderstands.The table
organizesthemin ascendingorder.Infact,ASCIIisorganizedin awaythat
actuallymakessense.
Flipbacktherefora quicklookrightnow.Seehowyoucan slicethetable
into clumpsof 16or 32, based on what’s in the zone portionunder the
hexadecimalcolumn?Theseclumpsmakesubgroupsof similarsymbols:
● hex00 to IF arethe commandsymbolscalledcontrolcodes,
● hex20 to 40 arethe commonkeyboardsymbolsandnumerals,
● hex41 to 60 arecapitallettersandthelesscommonkeyboardsymbols,
● hex61 to 7F arelowercaselettersanda few finalsymbols.
That takes care of the first 128ASCII symbols.However,nearly every
cofnputerand printer manufacturertreats the second half of the table
differently. Hewlett-Packard,for example, puts a variety of accented
foreignlanguagecharactemintopositions128-255(oftenreferredtoashigh
ASCIZ).Epson gives you a choice of either italics characters or IBM
charactergraphics.
1.2.3 Controlcodes
TheASCIItableshowssymbolslikeJor2 thewaytheyactuallyprintonthe
laserprinter.ButASCIIincludesmorethanjust printablecharacters:none
of the controlcodecommandsat the beginningof thetableactuallyprint.
Instead,when your computersendsa controlcode to the laser printerit
makesyourprinterdo otherthings,suchas sounditsbeeper.
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