[Coco] Graphics modes

Mon May 13 16:57:26 EDT 2013

seems those composite to vga converter doesn't like coco signal and
interprets colors as vertical lines. Everything looks like a banana in
pijamas. The only way to make it usable is through black & white screens
what is a pain:

On VDG screen you can make:

PALETTE 12,0
PALETTE 13,63

or the inverse: 12,63 and 13,0. You can as well use 40 columns: WIDTH 40
and then CLS 5

For os-9 you need to blindly change a window and change to it:

xmode /w7 fgc=02 bgc=0 bdc=0
shell i=/w7& and press CLEAR.

play with other color numbers until you find one useable for you.

On Mon, May 13, 2013 at 4:49 PM, Bill Gunshannon <billg999 at cs.uofs.edu>wrote:

>
> OK, moving along nicely at this point but now I have a new kind of
> question.
>
> I have been trying out differnt kinds of adapters for getting my
> COCO3 to display on a decent monitor as all I really have from
> the "good ole days" is a CM5.  It works, but the screen is tiny.
>
> So, I now have a box that seems to do a good job of taking the
> composite video and displaying it on a VGA LCD monitor.  Now for
> the kickers....
>
> The "Three Stooges" displays great.  DECB is somewhat blurry and
> has vertical lines running thru it.  When OS0 starts to boot up
> the display of modules loading is pretty good.  White background
> mostly black letters (might be some artifacting causing some of
> the letters to appear to be other colors).  But then, when it gets
> to the shell the screen seems to go back to the same green it was
> under DECB and it has the vertical lines again.  Of course, the
> font is smaller so in general it becomes unusable again.
>
> Can some one explain what the graphics modes are during the startup
> process for OS9 and where I might go to change them into something
> usable for me?
>
> Once I get done playing with all these adapters  I will let people
> know which work and which don't.  Maybe I need a game or two to run
> to test those modes as well.  I don't imagine there is any kind of
> a display benchmark program floating around anywhere.
>
> bill
>
>
>
> --
> Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
> billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
> University of Scranton   |
> Scranton, Pennsylvania   |         #include <std.disclaimer.h>
>
>
>
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