Re: 16-Bit Math on 8-Bit Numbers, the Conclusion (was Re: 16-Bit Math on 8-Bit Numbers [HPLOT in Machine Language, Part II])

[salfter@chakotay.ncc74656.org (Scott Alfter)]

In article <jonINTERNETrelayCHAT-1403001734300001@nn-157-22-180-213.napanet.net>,
Jon Bettencourt <jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet> wrote:
>Now I just need to build a custom output routine and an Applesoft
>interface to it. Does Applesoft's FRMNUM subroutine (at location DD67)
>stop calculating formulas when it reaches a comma?
>
>I would like to do something like CALL 16599,(31-3),VAL(X$)+X+21,333-X
>(assuming the Applesoft interface routine starts at 16599, (31-3) is a
>horizontal coordinate, VAL(X$)+X+21 is a vertical coordinate, and 333-X is
>a character number for a font).

Hmm...depending on your needs, you might not need to "reinvent the wheel."
A few years back, I threw together a double Hi-Res character generator that
lets you load an image (either uncompressed or compressed) and then add text
to it with simple PRINT commands, accept INPUT from the user, etc.  I
originally put it under a "free for non-profit use, but check with me first
for commercial use" license; now it's under the less-restrictive GNU General
Public License.  I'll post it to comp.binaries.apple2; you can also grab it
from http://salfter.dyndns.org/dhrchargen.bxy (should start downloading as
soon as you key it in or click on the link in your newsreader).

It implements 80-column text in a font that duplicates the Apple II's normal
character set.  On a IIe or IIc with a monochrome monitor, there's no
telling the difference between its output and the normal 80-column display,
other than it's a little slower (with 8x the data to blast to the screen and
more math to do, it'll be a little slower).

If nothing else, it might serve as a jumping-off point for your own work
(but please heed the terms of the GPL if you do this...see
http://www.gnu.org/copyleft/gpl.txt for details).

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(IIGS(  Scott Alfter (salfter at (yo no quiero spam) delphi dot com)
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