Ghosts N Goblins character sprites ROM?

srarcade80

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I have a Taito Ghost n Goblins board that has bad sprite graphics. The game powers up fine, runs, sounds good, backgrounds look great but the character sprites are all missing from the screen. There are some garbled sprites scattered about on various parts of the screen at all times. I have removed and cleaned all the ROMs, it looks like I will need to get a new burn done for this one in particular. Does anyone know which one it is?

I have heard of some people troubleshooting stuff like this with MAME but I think that involves compiling yourself to run the game with missing ROMs etc etc. I searched around a bit and looked at MAWS but it didn't really say much.

Thanks!

EDIT - I found a schematic for the game on this board (http://www.dsbelec.iinet.net.au/GhostsandGoblinsSchematics.pdf) and after reviewing it, i see page 19 has info about the character generator ROM. I will begin my troubleshooting here and see where it leads me. Any suggestions appreciated!

Thanks
 
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I'm having a similar problem with a Ghost n Goblins cab I just bought. I just got it a few days ago and it appears as thought whoever owned it before has converted a Pac Man cabinet into a ghost n goblins game. The games starts up and runs, the backgrounds, and fonts are fine, but the character sprites are weird. It only seems to draw every other line of the characters and sometimes will draw parts of other character animations just offset from the sprites. I haven't figured anything out about how to fix this yet, so if you find anything out I'd appreciate it.
 
If you have +5v on both boards i would try swapping out the sprite ram first, sounds like a classic case of bad ram.
 
I had a problem like that on a Ghost and Goblins original pcb. It turned out to be a bipolar prom, I think (but don't quite me at location 14k) but we are talking about 8 years ago so I'd need to check the board. I only identified it by (1)how hot it was, (2)the crack in the case (3)the fact that someone had inserted it the wrong way round....
 
Kdoe, if you fixed this, how did you fix it? Did you just flip it around the right way, did you have to buy a new chip, a new board, or some other way? Also, was it a problem more like mine or srarcade80s?

I got a pretty good deal on this machine and a double dragon machine, but the deal would be even better if I could get them both working perfectly. So I might as well get as much information as I can.
 
Well, the temperature the chiip was running at and the crack in the case virtually guaranteed the original would never work. If i remember correctly the game didn't even boot until I removed the chip. Anyway, I fixed the game by replacing the chip but you need to have it programmed first and I think it's slightly harder to do as bipolars are write once only. I don't have a programmer so I bought the right chip and sent it to someone to program for me.

As regards the actual fault I had it was that everything played fine once the dead chip was removed but the foreground sprites were all missing, a suspect part here could also cause corruption of the sprites or draw every other line but ymmv.

Cheers

Karl.
 
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If you go to the Ghost 'n Goblins entry on the Arcade Museum page and look at the image for the pcb they have posted, in the bottom right corner there is a large chip on the board, it says 85H001 5H on it. I was wondering is this chip was in anyway associated with the graphics? Because on my board that chip has been replaced with a smaller pcb that connects to the pins for that chip. I downloaded the schematics that srarcade80 linked to, but frankly I don't know enough of what I'm looking at to know. I was planning on pulling out that board and trying to clean the pins to make sure it's connecting properly, but I figured it wouldn't hurt to ask.
 
Well, if it helps look at the 'object rom' page of the schematics (page 14k) and the chip at 14k is marked '7611; which according to

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=info&page=PromRef.txt

is a 82s129

datasheet http://www.datasheetcatalog.org/datasheet/philips/82S129.pdf

So.... while you don't know if that is the faulty chip you do know it is part of the chain that results in the foreground characters being displayed correctly. You could have a poke around that area of the schematics with a logic probe to see if that area of the board is totally dead. Have you tried running the board and doing the 'hot chip' test yet as anything in that area running significantly hotter than anything else on the board could be suspect.
 
FYI, proms run hot to the touch normally so dont assume its bad if its warm. If it were me I would verify all the roms first then start looking at rams.
 
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