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ZN1 Bios <V2> board arrives!

Hammy said:
Those ram are also good for the namco boards system 11 / 12 they do die normally of rust / leg rot.

The other ram that may be needed is much harder to find: KM48V2104AT
8 is needed for the work ram, Mr Guru says there's no change to resistors / caps for that one but i'm still skeptical.
I would not worry about the work ram upgrade until PR2 is loading up to some extent in real hardware....
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Yeah...I won't have to worry about that....PR2 aint gonna be my thing. Checked it out at Galloping Ghost, and will be just fine letting that one go.

I know its a big deal for lots of other people though...so I hope parts can be sourced.
 
jassin000 said:
I was sick of waiting, so I called out of (lame) work today to finish my boards up...
DWKz0PN.jpg

kZ7ZkwH.jpg


With ALL three PCBs finally soldered its time to work with @ekorz on the ROMs/chips. :D
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decoupling caps no ?
 
AlxUnderBase said:
decoupling caps no ?
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Best to quick test first to check for soldering errors on the connector, and after add the bypass caps and check again. This way there's less to fault find!

EDIT: make a mistake on the bypass / power rails and it's boom
 

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V2!
3 flying wires!! I don't think it can go any lower :P

Bad news for any larger bios rom, 27c322 won't work.
From now going forward, i think the bios can go on a connector for simplicity - 3 wires is not as important to keep it in place.

V3 Fixes will be:
2nd half dip bank working + spot for missing RA's
 

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Forgive my ignorance, but, what's the goal of this project?
 
Hackcell said:
Forgive my ignorance, but, what's the goal of this project?
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I suspect its slightly different for everyone, if you are asking me personally?
  • I don't want to pay taxed out prices for single boards that basically run on the same hardware/platform.
  • I would like this work to potentially lead to some type of multi or bank switching top board.
  • I want to support @Hammy work, so he continues to bring us fun projects like this one in the future.
 
jassin000 said:
I suspect its slightly different for everyone, if you are asking me personally?
  • I don't want to pay taxed out prices for single boards that basically run on the same hardware/platform.
  • I would like this work to potentially lead to some type of multi or bank switching top board.
  • I want to support @Hammy work, so he continues to bring us fun projects like this one in the future.
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Thanks for the explanation! Makes full sense now!!!
 
This is so exciting and now that I have a good donor board, I'm really looking forward to the finished product. Thank you for your hard work!
 
(Alucard voice) I’m interested in this. More specifically the zn2 multi
 
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