exxos's Atari, Amiga & retro forum

Icky wrote: 27 Nov 2018 19:25 I thought that too. Changed res and it still has that purple dark mode.

Odd if desktop doesn't work, but loading a game does :stars: :stars: :stars:

Does the diagnostic cart have a RGB test ?

exxos wrote: 27 Nov 2018 19:33 Does the diagnostic cart have a RGB test ?

Yes there is a colour test. I also reverted to original configuration to compare.

Colour test using Diag cart with Video DAC board in place:

Colour test using Diag cart with original circuit in place:

How odd.. half looks like its not bright enough.. but doesn't explain odd colours getting mixed in...

maybe I have screwed up one of the RGB lines on the chip or something :shrug:

Also using DiagCart in original mode the background is blue with white text.

Using the Video DAC board the background is black with slightly yellow text.

Original:
Video DAC Board:

Well here is the diagram..
and the pdf...

https://www.exdwh.com/data/STV8438CV.pdf


There is also the wiring between the schematic and the actual device.. will try and post that shortly to check...

pinout for the package...

exxos wrote: 27 Nov 2018 20:05 Well here is the diagram..

sch.png

and the pdf...

https://www.exdwh.com/data/STV8438CV.pdf


There is also the wiring between the schematic and the actual device.. will try and post that shortly to check...

I'll start to take a look. In the mean time here is the boot to desktop using the Video DAC board.

Is there any benefit from me duplicating the results at the mo? Or should I wait on assembling it?

Forgottenmyname wrote: 27 Nov 2018 20:16 Is there any benefit from me duplicating the results at the mo? Or should I wait on assembling it?

I would build it, see if you have the same issues.. I mean maybe its a bad chip :shrug: