Good morning to all! I'm fixing a WMS Phoenix CPU and I have a trouble with roms... so I need a clarification and your help
The original set (of course) is made of 4 masked proms&roms that I would like to replace with 2716 eproms.
I downloaded eprom images from Planetary Pinball and with my surprise I found that these are white labels for a System 4, when usually for a Sys 4 they have to be yellow... but I burnt them with my Willem GX-4Q programmer.
The CPU is 100% functioning, also tested with yellow label eprom of my Stellar Wars... but with the white eproms freshly made, it has problems on power up. Strange behavior both in test and once placed in the game.
For your information, I burn 3 times the eprom... always the same problem
Any suggestion???
Thanks in advance!!!

Ciao

Yes, I changed the sockets... I said the cpu works good with yellow labeled 2716 of my Stellar Wars, but with these ones of Phoenix not...
So my thought is a problem with white images in a sys 4 board, or a corrupt file (hard but could be), or a mistake during the writing with the programmer...
I didn't try the original proms in order to not solder other sockets to the board. And a 2716 is more reliable than masked rom.

So, is what I did. Without mixing the romset!
But the SAME board, with Stellar Wars roms boots in a correct way in audit mode or attract mode (with batteries or the trick on the cabinet switch)...
With the roms or putting the original proms, the SAME functioning board boots in a strange way: the number in the credit display rise up in sequence, as if it's showing me the audits. But I repeat... the board is the same and it works 100%!
Is there something that I'm missing?!?

Thanks Barakandl! It seems like you described to me... the audits scroll, but however I can do properly the nightmare programming!
Another question if is possible...
What about the master display? I've a flickering in the strobe No. 8 when the number 1 is shown.
When the other numbers are displayed, the strobe works fine... have you any suggestion to solve this?
Thanks again!