[Coco] v9958 on coco

[Mark Marlette]

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.

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.

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