Pac-Fan
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JROK SOHS (Save Our High Scores) NVRAM mod failures
I performed the JROK NVRAM mods to 3 of my games. Only 1 of them has had no problems after the mod.
Q*Bert working perfectly.
Super-PacMan: After a week off, power up and it immediately coins up and starts a game and plays multiple sounds on top of each other. High score table zapped but main high score still there. Power cycle and no subsequent problems. Had burned in this board for 24+ hours before mod and used about 8 hours after mod before shutdown, and power cycled a few times over a month without loss of HS or other problems before it flaked out.
Frogger: Kept scores for a week or so, then had dots instead of names for high score list. A few days later all scores cleared with JROK default initials.
Voltage on all boards tests ~5.0 volts. QB/SuperPac have original power supplies, QBert has the cap mod to the reset line as well. Frogger has newer switcher.
All NVRAMs were manufactured in 2008, new stock from ST. Not dealing with old Dallas pulls.
Anyone else see failures with these mods?
I performed the JROK NVRAM mods to 3 of my games. Only 1 of them has had no problems after the mod.
Q*Bert working perfectly.
Super-PacMan: After a week off, power up and it immediately coins up and starts a game and plays multiple sounds on top of each other. High score table zapped but main high score still there. Power cycle and no subsequent problems. Had burned in this board for 24+ hours before mod and used about 8 hours after mod before shutdown, and power cycled a few times over a month without loss of HS or other problems before it flaked out.
Frogger: Kept scores for a week or so, then had dots instead of names for high score list. A few days later all scores cleared with JROK default initials.
Voltage on all boards tests ~5.0 volts. QB/SuperPac have original power supplies, QBert has the cap mod to the reset line as well. Frogger has newer switcher.
All NVRAMs were manufactured in 2008, new stock from ST. Not dealing with old Dallas pulls.
Anyone else see failures with these mods?
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