Guys,
I've got a Bubbles (in duramold!) that's been sitting for 15 years in my warehouse and today I pulled it out to get it going. I thought it would be a 5 minute repair, but now I'm stumped.
On powerup, it goes through RAM test rug, says "ALL SYSTEMS GO," then flashes the "high score reset" line and immediately resets.
I've tried:
1) New power supply
2) different working CPU board
3) different working ROM board (from Joust)
I took a Joust ROM board and hooked it up to the cab, and Joust boots completely and fine. Then I swapped all of the ROMs between the joust ROM board and the Bubbles ROM board. The problem followed the ROMs! Now the former Bubbles ROM board boots Joust fine, and the former Joust ROM board resets just like before.
So I figured, maybe it's the ROMs. So I swapped all of the ROMs with a "known good" set of Bubbles ROMs....same problem. In fact after building another boardset, I now have two Bubbles boardsets with this same problem.
I guess in typing this it seems that the problem must be in the ROM images...but it just seems unlikely to me that both would have the same problem (especially since both were tested good 10+ years ago). And I thought it tested the ROMs anyway before the RAMs...?
I don't have any more Bubbles ROMs to play with...should I just find somewhere to download them and compare? Have any of you seen this problem?
Thanks in advance for any help you can offer!
John
I've got a Bubbles (in duramold!) that's been sitting for 15 years in my warehouse and today I pulled it out to get it going. I thought it would be a 5 minute repair, but now I'm stumped.
On powerup, it goes through RAM test rug, says "ALL SYSTEMS GO," then flashes the "high score reset" line and immediately resets.
I've tried:
1) New power supply
2) different working CPU board
3) different working ROM board (from Joust)
I took a Joust ROM board and hooked it up to the cab, and Joust boots completely and fine. Then I swapped all of the ROMs between the joust ROM board and the Bubbles ROM board. The problem followed the ROMs! Now the former Bubbles ROM board boots Joust fine, and the former Joust ROM board resets just like before.
So I figured, maybe it's the ROMs. So I swapped all of the ROMs with a "known good" set of Bubbles ROMs....same problem. In fact after building another boardset, I now have two Bubbles boardsets with this same problem.
I guess in typing this it seems that the problem must be in the ROM images...but it just seems unlikely to me that both would have the same problem (especially since both were tested good 10+ years ago). And I thought it tested the ROMs anyway before the RAMs...?
I don't have any more Bubbles ROMs to play with...should I just find somewhere to download them and compare? Have any of you seen this problem?
Thanks in advance for any help you can offer!
John

