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Downloadable and Custom Commands
Descenders
Earlier in this chapter we mentioned the descender informa-
tion. When we left it as azero you probably thought this was easy.
Well, it is! We only have two choices for descender data; it’s either
a zero or a one. When it’s a zero, nothing happens. When it is a
one, all the dots that make up our character are shifted down two
rows. Why do we want to perform this magic? If you look at the
lowercase g in magic, you can see that the tail of the g drops down
below the bottom of other characters. This is a descender. Let’s
take our copyright symbol example and define the @ symbol as
we did before and make the “&” symbol our copyright symbol with
a descender (shifted down two rows).
!O REl4 brfinc the Ercaoe character
20 ESC$=CHRS(??!
24 REtl COW c5aractws to RAM
i5 LPR!NT ESCl:CHR((421ICHRI(O):
30 REtI Define cwyright svmbol in place of Q
40 LPR!NT ESC~ICHRS(~~):CHR((I):CHR$(~~):CHR~(O)~CHR$~~S)~CHR~~~~)ICHR$~?~!~
~HRi!iO~~CHR1~6S~~CHR(oleHRllbS!ICHR$~S4~~CHR~f~O~~
44 REN Deflnr cotwright svmbol in olrce of t
45 LPRINT ESC(ICHR((~~)~CHRI(~I~~HRI(~~)~CHR~~~)~CHR~(~S~~CHR~(S~!~CHR~(~~):
CHR~!~~):CHR~(~S)ICHR~(~O)ICHR~~~~)~CHR~~~~)ICHR~~~O~~
$0 REF Select downloadrble chtrrcters
60 LPRINT ESClleHRI(56)lCHRI!l) I
70 REM Print our nw rvmbols
90 LPRINT “W&@!&@tlt@tb&”
Figure 8-6. Program /is ting to print:
y ::: .?. :..,. .;;x ‘?. .q ../ r?. :” Q .? r^. ” p -.
,, i I ..,. _. >n:,. ._ s..,:; :.r .A:.. -. .+. b.. 1. -. !‘.:,.
One more instruction you’ll need before we leave
downloadable characters: How to turn them off.
CHR$(27) CHR$(36) CHR$(O)
Turning downloadable characters on or off during a line will
affect a// characters on that line. In other words, if you turn on
downloadable characters anywhere in a line, all of the characters
on that line will be treated as downloadable characters.
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