buxtonore
Member
Does anyone know which one of the boards, and which chip would cause this? I am able to start a game but it ends in about 10 seconds and the ship gets bombed immediately. Also the controls do not work. Thanks
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It looks like you have some RAM issues. When you say "bombed immediately" I'm assuming you mean the player ship explodes immediately? This is likely caused by some of the stray extra pixels you see on the screen triggering the "hit detection" in the U15 custom as soon as the game starts. It's also possible the U15 custom is having an issue as well but I would start with the RAM.Does anyone know which one of the boards, and which chip would cause this? I am able to start a game but it ends in about 10 seconds and the ship gets bombed immediately. Also the controls do not work. Thanks
You were right. I switched the ram cards and I have a slightly different pattern now.I too would vote for Ram.
I suspect that if you swap the two small boards in the back of the cage it would change what you're seeing on the screen. Swapping will not resolve the issue but it'll likely change the issue and confirm it's one of the ram cards (small boards).
Where do you get the GORF Test-ROMs?There are Test-ROMs for Gorf avalable:
Midway Space Zap Technical info
Space Zap is a Black and White 'twitch' style game and is part of the Bally Midway "Astrocade" Card Rack system of games. (GORF, Wizard of Wor, Robby Rotto, 10-Pin Deluxe) Most of the Midway Card Rack games have 6 cards. Space Zap has 5; Two RAM cards, a Pattern card, a CPU card, and a Game...forums.arcade-museum.com
There are links to the .bin file in that post.Where do you get the GORF Test-ROMs?
Thank you!There are links to the .bin file in that post.
Note, that Mark's test will tell you first bad ram you get to (which may or may not be the only bad ram). So, you'd have to replace that with a new 4027 ram and then retest to find another/others which is bad.
If you have the original Bally test cards (like I do) it tests all 16 rams at once on each board. That can tell you if there are several and also help you determine when repairing any one ram board becomes cost prohibitive.
All that said, your image isn't horrible so probably one or two bad rams. And on that topic, I find that Twisty Wrist has the best prices on 4027's…. and they're currently on sale!
Good luck.
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There are links to the .bin file in that post.
Note, that Mark's test will tell you first bad ram you get to (which may or may not be the only bad ram). So, you'd have to replace that with a new 4027 ram and then retest to find another/others which is bad.
If you have the original Bally test cards (like I do) it tests all 16 rams at once on each board. That can tell you if there are several and also help you determine when repairing any one ram board becomes cost prohibitive.
All that said, your image isn't horrible so probably one or two bad rams. And on that topic, I find that Twisty Wrist has the best prices on 4027's…. and they're currently on sale!
Good luck.
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Thanks for the clarity, Mark, that's interesting. If I understand you correctly both tests (your ram test and the Bally test) are in effect testing all 16 rams but whereas the Bally test reports back on all 16, your test only reports back on one at a time. And using your test rom in order to understand if any more rams are bad, you'd have to replace that bad ram and test again. Correct?The RAMs are all interleaved -- any test code tests all of them at the same time.
The only difference is how the errors are reported.
The RAM test on the bally test cards isn't very exhaustive, but it at least finds completely dead RAMs.
Thanks for the clarity, Mark, that's interesting. If I understand you correctly both tests (your ram test and the Bally test) are in effect testing all 16 rams but whereas the Bally test reports back on all 16, your test only reports back on one at a time. And using your test rom in order to understand if any more rams are bad, you'd have to replace that bad ram and test again. Correct?
Effectively, it doesn't change my original advice above that the Bally test is more helpful as it's not uncommon to find many (including all) rams on a board as bad so it's super helpful to know how many are bad so that you can assess the viability of repairing that board before you begin.
what's the curiosity? whether anyone would actually spend that much on ram cards? lolI'm really curious about Sean's new RAM cards that utilize 4164 RAM.
Jason