Arcade Resources
Figuring out OL, OH Dig Dug PCB error
I have gotten a little motivation back, and took a little time to investigate this further.
I had been going back and forth with Bob Roberts on this chip, and without even looking at my board I was able to kind of figure out with his help that this chip was plug in play, which meant it should be socketed and no soldering necessary. Plus, since it was PnP, that meant I didn’t have to burn anything to it either. He said the chips are very sensitive and this is fairly common.
In the Dig Dug manuals, it says that a OL and/or OH error are due to a bad RAM. It just depends on what version of the Dig Dug PCB you have to find the location on the board. If you have Revision A, the position is 9M, and if you have Revision B of the PCB, then it is position 4K.
I thought for sure these positions would be printed in the manual, but they weren’t. I pulled the board out and did a comparison of component side elements on the board to the two drawings in the manuals. I have a Revision B Dig Dug PCB, so that meant my bad RAM was at 4k.
Here are some photos of the PCB. I circled the 4k labeling, it might be hard to see. Also a photo of the bent RAM and the RAM in the socket.
I took a look, and it was obvious. There my RAM set, with the front leg bent and barely in the socket. I was floored, how had it worked up until now? It might be as simple as taking that chip out, bending the leg back, and the game might work. Well, I did just that, and it didn’t work. So I am guessing that after so much time of it being almost bad corrupted the chip.
I am checking with Bob to see if he has that chip. The number on the top of the Chip says JAPAN 2E1 HM6116P-3. Would like to get a larger order of stuff to bring down the total cost for the one part, but if it means getting the game sold, I may not wait.
Jr. Pac-man finished!
It took me another four days of jockeying around, but I finally finished the Jr. Pac-man late late tonight.
Here is what I ended up doing…
I had some short white power coating shelf brackets from Lowe’s.
The Glob Cherries done
The cherries are done, now all that is left is The Glob. I got a great photo now from Rich to work with, so I can start at any point. I don’t think I’ll probably use all the characters, but better to have them then need them and not have them. He mentioned possibly doing stencils, which would mean the color matching from my end wouldn’t be as big of a deal, but I would need to do another process as the The Glob kickplate is designed, doing the separations for it.
The Glob – Monkey, Pig, & Rabbit vector artwork done
Got a chance to finish up the final touches on the monkey riding the pig today, and the rabbit was a two day trace of probably less than a hour total. Of course there will need to be some major color matching done for the monkey riding the pig, it seems to be way off. That is what sampling from the photo gets you. Feels good to have all of the animals traced (I think), and be moving onto The Glob himself.
I think I will need some better photos to work from of The Glob, but he isn’t that complex so I wouldn’t be surprised if I could get him cranked out pretty quick and be onto making the custom kickplate artwork, the fun part.
Jr. Pac-man’s in the basement ‘gameroom’
After we got back tonight, Sarah and I moved the Jr. Pac-man into the basement. Before we left on Friday the monitor connector had arrived, so the only thing left to do is put in the monitor in the cabinet.
It was really hot this weekend, after looking at the Jr. Pac cabinet closer I felt like it had warped a little bit. I had to put that out of my mind, there was nothing I could do about the cabinet now, just that much more important to get Jr. Pac inside tonight.
Jr. Pac-man was the hardest game we have moved so far. The unique Bally cabinet was just a touch wider than the base of the steps where the turn is always hard, so it took some fancy maneuvering to keep the game and walls safe and get it to the back room.
But, looks cool either way. Pretty basic and less than special when it comes to some of the gamerooms I have seen, including one this weekend, but that is going to have to do for now.
This is also the first photo with the new Ikea stools. Never liked round stools much, and after visiting Chris Moore’s gameroom this weekend, I saw a couple of different stools he had that he got from Ikea. Sarah loves the store, I had never been, so it just made sense to go and I am really happy about the choice and that I waited.
Now all I need is a real Mr. Do, a Galaga cocktail out in the main room somewhere, and, well, I’ll still sit on the pinball. I don’t even know how that would work.
Wizard of Wor problem was a sync issue
I couldn’t believe it a little bit myself, for how bad those lines were, but that is exactly what it was. Once I started messing around with both vertical and horizontal sync, I got the picture back square and almost stationary. Except, no matter how fine of an adjustment I make, the screen still rolls. The lines are gone, so Mark’s fix worked just fine, but I can’t fix the vertical sync.
I made sure the card was seated, and adjusted everything but it still slowly rolls. I just replace the caps in that, what, a month ago, so those shouldn’t be an issue. I suppose the connection could be bad. Not sure what to do, need to have time to research a solution, but I suppose I could finalize one of my other two almost working monitors and swap them in. But then, I would still have this one that I would have to fix at some point….
Or I could just sell it. It mostly works and would just need a touch of tlc. I don’t know how desirable a 19K4600 Wells Gardner monitor is…
Missing Monitor hookup for Jr. Pac-man
Sent payment for the Jr. Pac yesterday, so I felt comfortable asking Rick how to hook up the monitor. After a series of emails, it came out that the monitor hooks into the top of the PCB on the right side. There is another connection on the left side as well that attachs right into the harness. There was no connector on the right side, and I looked inside the game in case it came loose, wasn’t there either. So it sounds like he is going to send it to me in the mail today so I have it by Wednesday or Thursday of this week. I was really hoping to play it sometime before Friday for sure.
Plus, I had forgotten about the monitor brackets. He had mentioned that original Jr. Pac owner had taken them out with the monitor before Rick bought it. The Pac-man ones I have won’t work, just a little too short. I am going to try to go to Home Depot this week and try to find something that will match, I have read in the forums that people have found things. I also need some tinted plexi, but I am less worried about that right now…
Other info about the game…The swelling that I mistook for water damage towards the back of the cab can just be caused from heat he said. He said he sealed it off, hopefully preventing any more swelling. That makes me glad it is sitting in the garage now that it is a little cooler out. I also identified the serial no. #333, it’s stamped on the back of the cab above the back door. The Mappy serial is stamped there too. The Serial is in the cab still too on a piece of paper, A29-00333, and you can see where the old Mappy tag was on the harness.
Rick also said that the tracks that are in the bottom where the new switcher supply is are for the old linear power supply board that almost always fails in these games.
