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What Andy said (not that I have a GQ-4X), but start with something basic that'll meet your core needs, and then go from there if you're just getting into it. I started with a programmer on my Apple //e that only handled three sizes, then to a Needham's PB-10 (and still have it hanging off a...

https://gameboardsusa.com/shop/ols/products/auxilliary-circuit-board-assy-diagnostic-and-repair-program-with-new-ribbon-cable - these are the folks that bought out Two Bit Score I believe...

Did continuity checks across the 51xx and 53xx sockets - as well as all the other customs - no issues. No physical damage on the bottom of the board that I can find, and same with the top. I suspect I'm going to be down to simply tracing through what's downstream of the three CPU's and the...

Swapped in working ones from the other board and no change, but will go over the sockets to ensure I've got continuity across all pins - thanks!

It's not resetting (stops at the RAM OK/ROM B screen), so no change.

Hey folks, Hoping those of you who work on Dig Dug boards may have some suggestions on where I should look next for an oddball issue. Have a Dig Dug rev. B board I’m working on for a fellow local KLOV’er. Currently boots and stops with “RAM OK“ and “ROM B“. Boot Video Manual shows options...

...Note that in this case the definition of "support" is "don't ask me any questions", based upon my personal and the collective experience of several others. I've followed his YouTube channel for years, and while I do enjoy watching most of his repair videos, he's definitely a bit prickly to...

What Andy said. This sounds very much like monitor interference to me. Most folks pack their games in as tight as they can, since space is a premium, but you end up with the monitors interfering with one another in some cases. I've noticed that the convergence is off on the bottom of my...

Sample parts list provided by Mirko for building up these PCB's, for future reference: 2x 40-pin ribbon cables: https://www.digikey.com/en/products/detail/3m/1700-40-100/9478781 4x straight IDC connectors...

If you're planning to pick one of these up, start hunting down MC6875L clock chips if you don't already have some. Used on some older Williams pinball MPU's (System 3/4), but NOT easy to find otherwise. I had to order mine from Bulgaria. The PCB's that Mirko has made up will greatly simplify...

BK864 is the shit - they pop up on eBay occasionally for reasonable prices too. I had a chance to buy three unknown condition but complete ones a year or so back for under $300, and was mighty tempted, but I've got 6 programmers already - include one for the Apple II series, and the Needham...

This, 100%. Even if it's an older model with older software, and only basic features, I'd prefer it to the cheaper/newer burners on eBay, as they can be unreliable. I've purchased a single one, and it was flaky, and didn't handle many of the chips it claimed to. Don't assume you can burn...

My original board was working fine (it's the one I repaired in the earlier posts in this thread), and the new board was repaired within an hour or so of unboxing, so it's all good :) What's really nice about these boards is having two identical circuits for most of the functions - each tank has...

Just picked up another boardset after patiently waiting/watching eBay for a few years. Remarkably clean and nice cosmetically. Replaced an obvious bulging capacitor, dropped it in, and it fired up with only a single issue. Black tank (tank #2) shell was not visible on the screen. Quickly...

Haven't had time to dig that (and the other) boards back out yet, but it's on my to-do list.

Pretty sure I'd need at least two, possibly three, so I'd be interested regardless of who gets something available :)

Yeah; I came across this one after replying above - may be the one you're thinking of.

I replied to your other thread regarding the 80-902 daughterboard, but will check through my MPU boards to see what I've got when I get a chance. Let me know if you need more pictures of the 80-902 otherwise. I've often thought about the lack of a good resource that covers all the differences...

Not sure exactly what information you're looking for, but here are a few images for reference... Dusty/dirty board that's been in storage a while, but hopefully you can make out any necessary details regarding parts, how it's installed, etc. If memory serves, this MPU board was configured...

Came back to this CPU board after finishing up a different CPU board (repair log to be posted soon). I’ve since swapped the sockets for the 10xx customs (3H/3F/4H/4F), the sockets for the 08xx customs (6H & 8H). No change. RAM 2, RAM 3, and RAM 40 when it succeeds in getting a bit further. If I...