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Author Topic: Universal Arcade Games  (Read 5755 times)
channelmaniac
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Few things are better than fixing an old game...


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« on: December 02, 2012, 05:44:01 PM »
Model: Mr. Do's Castle
Symptom: Upgrade to NVRAM

Removed and reprogrammed ROMs 1 through 4 with the JROK code for adding the High Save Score feature. Removed 1 SRAM and replaced it with a socket and a customer supplied DS1220 NVRAM chip.

Board would not boot with the DS1220 in the socket. Installed a 9 pin 470 ohm resistor pack to tie the first 8 address lines high and tested successfully with the DS1220 in the socket.
Logged
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
channelmaniac
Surface mount soldering geek
Global NLG Site Moderator
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 568
Offline Offline

Gender: Male
Posts: 2126


Few things are better than fixing an old game...


WWW
« Reply #1 on: January 01, 2013, 10:20:53 PM »
Model: Mr. Do
Symptom: No sync

Board had been modified to put separate H and V sync out. Removed 2 jumper wires and resoldered two cut chip pins to remove mod. Tested. board.
Logged
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
channelmaniac
Surface mount soldering geek
Global NLG Site Moderator
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 568
Offline Offline

Gender: Male
Posts: 2126


Few things are better than fixing an old game...


WWW
« Reply #2 on: January 04, 2013, 09:17:04 PM »
Model: Cosmic Avenger
Symptom: Will not coin up

Boardset requires +5v on the coin inputs when idle and is detailed in the owner's manual wiring diagram. Either wire +5v straight to the switches or simply use a 1K ohm resistor on each coin switch input on the PC board to tie the inputs to +5v.
Logged
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
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