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])

[jonrelay@napanet.net]

> 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).

Actually, I figured it out. The built-in routines in Applesoft did
exactly what I wanted them to do. Now I just do a CALL 16544,20,1,33 to
display the 33rd character on the 20th column in the first row. I got
the custom character output routine almost working too (I think I solved
all the problems; I just need a routine to scroll the high-res graphics
page up 8 pixels).



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