[Coco] 64 column "low res" text sceen on coco3

[Arthur Flexser]

So, all these years we've all believed that the CoCo 3 didn't support any
of the higher-resolution semigraphics modes...

If I'm following you correctly, the CoCo 3 could be used for 128 x 32
semigraphics drawing, intermixed with half-width (but fully drawn)
VDG-style text.  Weird that one one seems to have noticed before.  Nice
work!

Art
On Thu, Apr 11, 2013 at 5:42 PM, William Astle <lost at l-w.ca> wrote:

> I don't know if this is known or not. I can't believe I'm the first person
> to try poking values into $FF99 while in the 32 column "low res" text mode.
> Anyway, I found it interesting.
>
> Anyway, with the GIME set up for the 32x16 "coco2" text screen, if you set
> $FF99  to $10, you will end up with a 64x16 "coco2" text screen which uses
> 1024 bytes of memory. This screen still supports all the "SG4" graphics
> blocks.
>
> The "lines per field" setting seems to work, too. Setting it to 200 or 225
> lines seems to work as expected. Setting $FF99 to $70 yields a 64x19 text
> screen though the bottom 3 rows of the last line are missing. ($60 would
> give 32x19.)
>
> If you're messing with this from basic, you'll need to use a program like
> the following to see the result because basic resets all the video
> registers.
>
> 10 WIDTH32
> 20 POKE&HFF99,&H10
> 30 GOTO30
>
> Note that this is totally distinct from the high resolution 64 column text
> mode.
>
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