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Arcade & Retro Repairs & Mods, all new recipe, with no added MSG...
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oh also I'm now a contributor on jammarcade.net
for those who prefer the more succinct reading format
http://www.jammarcade.net/capcom-1942-pcb-repair-log/0 -
oh also I'm now a contributor on jammarcade.net
for those who prefer the more succinct reading format
http://www.jammarcade.net/capcom-1942-pcb-repair-log/
Love this,
I cant help but read it in your voice thought !!0 -
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well speaking of which
A kung Fu Master repair (another one) . got this one from Mitch a while back. Had issues on all boards of the stack. Some sync , graphic rom issues, chip enable lines and custom ic issues on the top board. Sound issues on the middle board and the clock issues on the bottom board. Got it all back running at the end but this was a long one.
got one of Caius' repros from jammarcade.net but I'll be looking into making my own in the coming weeks too
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ram issue would most likely give out corrupter graphical elements. also I believe all the ram is on the A board anyay.
I would suspect it's a specific prom / mask rom issue on the B board or a corroded socket.
Looks like you've one or many bits stuck in one of the graphic layers.
btw by "Character Graphics" , did you mean sprites ? character graphics layer is typically stuff like letters (people forget these have to be drawn and stored ) , these can be used for other graphical elements like icons and also the logos since they sit on top of the bg and sprite layer . so here it sounds like the character layer is affected.
One thing I do to identify which eprom does what (at leas in the graphic area) is to remove one and power the game and check what area of the graphics is affected. The game should start but you'll just see blocks in lieue of graphic elements. Once you've identify the eprom(s) that holds the character data, check it against the mame file with an eprom reader. I wouldn't be surprised if one of the mask rom has gone bad0 -
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ram issue would most likely give out corrupter graphical elements. also I believe all the ram is on the A board anyay.
I would suspect it's a specific prom / mask rom issue on the B board or a corroded socket.
Looks like you've one or many bits stuck in one of the graphic layers.
btw by "Character Graphics" , did you mean sprites ? character graphics layer is typically stuff like letters (people forget these have to be drawn and stored ) , these can be used for other graphical elements like icons and also the logos since they sit on top of the bg and sprite layer . so here it sounds like the character layer is affected.
The sword guy is fine, the bad guys etc all grand. its whatever that information bar across the bottom is that has the lines in it. that and the main logo when game boots. So sprites seem fine, but the Character Graphics are the ones gone?
looking at that image again, it looks like some letters might be affected too, you can see "MAGIC" has some blue dots on it.One thing I do to identify which eprom does what (at leas in the graphic area) is to remove one and power the game and check what area of the graphics is affected. The game should start but you'll just see blocks in lieue of graphic elements. Once you've identify the eprom(s) that holds the character data, check it against the mame file with an eprom reader. I wouldn't be surprised if one of the mask rom has gone bad
Thanks for the help, ill try that out! Ive the bits to build a Super Gun setup on the way, at the minute im swapping in and out of a cab which is a pain.
Actually while youre here! The test bench you built in your video, you put a switch on it to turn the power on and off, what type of switch is that, i dont want to get one thats not suited and electrocute myself!these are the eproms. They can be erased with uv light so the window should be masked with a sticker idealy to prevent uv light to affect them.
The other black ones are mask roms. They have a similar pinout and can be read as 27c4000 i believe
Cool, one of them didnt have a sticker over it, i was hoping that would be the issue and be blank or something, but it read fine when i tested it.0 -
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made my second repair log post on jammarcade
repairing a CPS1 Street Fighter 2 CE : http://www.jammarcade.net/capcom-cps1-street-fighter-2-ce-repair-log/0 -
made my second repair log post on jammarcade
repairing a CPS1 Street Fighter 2 CE : http://www.jammarcade.net/capcom-cps1-street-fighter-2-ce-repair-log/
When can we start sending boards to you? 0 -
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made a series of little prom to eprom adapters.
It allows you to read proms (that can't be read or written with the standard eprom burners you find on ebay) .
So a 82s129/126 or 82s131 (or their other brands equivalents) can be read as or written to standard 27512/27256 (27128 should work too) eproms.
I've a couple of spare bare pcbs left from the first draft. I was going to throw them as the silk screen explaining the settings for 82s12x or 8s131 modes is inverted. not a big deal but I can't sell those so I thought I might give em to fellow boarders.
It's the bare pcb so you'll need sockets -16 pin to operate as prom reader, 28 pin to work as a eprom replacement, for the prom and eprom depending and pin headers.
I've 3 sets of each to give to 3 people. I don't think this warrants a ad but I can create one if it's an issue.
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made a series of little prom to eprom adapters.
It allows you to read proms (that can't be read or written with the standard eprom burners you find on ebay) .
This allow to read or write a 82s129/126 or 82s131 as standard 27512/27256 (27128 should work too) eproms.
I've a couple of spare bare pcbs left from the first draft. I was going to throw them as the silk screen explaining the settings for 82s12x or 8s131 modes is inverted. not a big deal but I can't sell those so I thought I might give em to fellow boarders.
it's the bare pcb so you'll need sockets for the prom and eprom depending and pin headers.
I've 3 sets of each to give to 3 people. I don't think this warrants a ad but I can create one if it's an issue.
Hi , I’d love one please if that’s ok , I’ve been trying to learn fixing pcbs lately watching Vids, reading and messing around with boards ! I can pay postage etc thanks a lot.0 -
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no worries. that's one set gone. 2 left
I'm also working on a series of jamma adapters and making some repro ICs at the moment. Starting with the Irem KNA chips , I should have the first protos next week.
Maybe I should make a pinned ad for all these in the marketplace ?0
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