[Coco] v9958 on coco

[Gene Heskett]

On Tuesday 04 February 2014 11:00:15 Mark Marlette did opine:

> Luis,
> 
> It could be that there is a lot of long wires interfacing to your
> circuit.
> 
> Hard to tell but almost looks like a proto-plug in type board as well.
> If so, a lot of capacitance per connection. IE: not good for digital.
> 
> You can chase ghost problems with this type of setup. Layout a board.
> Time vs money...you are ahead of the game... IMHO.

IMNSHO too. Some of the stuff I laid out and wire wrapped in the late '70's 
could still be going, but that was in the early days of cmos and even the 
video was discreet and slower.  Long wires can kill you, particularly if 
they are ground wires.
 
> Regards,
> 
> Mark
> http://www.cloud9tech.com
> 
> 
> 
> 
> ________________________________
>  From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Monday, February 3, 2014 9:43 PM
> Subject: [Coco] v9958 on coco
> 
> 
> Sorry for the portuguese video:
> 
> http://www.youtube.com/watch?v=gikKoaWTPZU
> 
> I plugged a yamaha V9958 on my coco1.
> 
> Still getting a greenish image, dunno why. Maybe I forgot some pin or
> vdp regsiter to set. But it works I set a 256 color mode and filled
> the entire screen using only pokes. The flikering artifacts are random
> sprites, i didnt fill the sprite table.
> 
> this vdp has up to 19K colors, hardware sprites and scroll. It wa used
> on msx2+ compjuters.


Cheers, Gene
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