[Coco] more overscan antics on the coco II

[Fedor Steeman]

Well, there was the Dragonfire binary!  :-)

Simon, you think you can figure out how to do the same  trickery as in
Dragonfire ? Would be interesting to see the source code of that.. .

Cheers,
Fedor


On 21 April 2013 22:01, Torsten Dittel <OS-9 at trs-80.cc> wrote:

> Simon Jonassen <simon at ...> writes:
>
> > Even more twiddling about reveals more posibilities....
> >
> > http://roust-it.dk/coco/more_overscan.jpg
>
> Simon, interesting. Did you figure it out on a real CoCo2 system, or is it
> just XROAR showing that behaviour? I assume it's a "stable" display you're
> showing? Could yo achieve that as well in HiRes Graphics modes?
>
> Did you have a look at http://TRS-80.CC/DRAGFIR2.BIN ? This has some
> stable
> partial border lines painted, some of them even with smooth vertical
> animation. Works with XROAR and on 50HZ PAL machines only.
>
> A screenshot here:
>
> http://www.6809.org.uk/tmp/da/pal_coco_probe/pal-dragonfire-1.png
>
> Keep researching! I guess the VDG contains more funny things we don't know
> yet (e.g. I never played around with desyncing it using the Hispeed POKE
> 65497,0 at the right point of time and then POKEing back to slow speed in
> the visible area).
>
> Regards, Torsten
>
>
>
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