: RetroHQ :

December 24th 2021, 11:27:42

I've now moved the 7800GD design over to using a Trion FPGA and have just ordered a prototype PCB. Definitely time to take a week off while that wings its way to me! 😄

: RetroHQ :

December 14th 2021, 08:17:02

I still can’t fathom how an image like this gets turned into logic. It really is the best kind of witchcraft! Absolutely amazing work and it just keeps coming. 😮
*takes a deep breath*
Here we go for the 051937, the last video chip I need to trace for TMNT.

: RetroHQ :

December 10th 2021, 22:34:37

Wow, cool, I’d never thought of using a metal brush for a quick larger area continuity check. That’s genius!
this is how I'm reverse engineering it. pick a pin, then use the brush to figure out what it is wired to.

: RetroHQ :

December 7th 2021, 16:43:10

7800GD feature reveal! I now have the ability to break into and return to running games. This will lead on to things like save states and game genie style cheats.

: RetroHQ :

December 3rd 2021, 17:01:41

That's now all the original commercial games running on the 7800GD on NTSC, including built-in POKEY support! I am aiming for dual POKEY and YM2151 support for final release.

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