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I'm stuck. I'm chasing my tail on a Mario Bros, and I wanted to step back and ask for some help. I have a pulsing Read signal, but Write stays high. All of my previous experience points me to RAM and program ROMs on the CPU board, but I believe I have ruled those out, and rung out all circuit...

If you want to destroy your female edge connectors, do this: If you want to do even more damage, snip the outside edges of the connector.

Fully assembled SMD LISY35 MPU board designed by LISY, I downloaded the gerbers from LISY.dev and had JLCPCB fabricate 5 PCBs and then install the SMD components. I've soldered remaining headers and through hole components on. - the 3x PICs are programmed and ready to go - Raspberry Pi Zero W...

Background, I've been working on a Williams System 11 F-14 Tomcat board, which has been had quiet a few bad components. Several of the MC6821 PIAs have been bad, several more that I haven't yet desoldered are probably also bad. I was looking into testers on the market for these chips and...

Why are these replacement MPU boards so darn expensive? Is it just that only one place is making them? The original boards don't look that overly sophisticated. 2-layer, very spread out. What am I missing?

As is, includes shipping. $20 Paypal-FF, $30 Paypal-G&S A-15868-L A-15868-R A-15869-L (cracked on obtuse corner) A-15869-R (chipped on obtuse corner) B-15871 B-15872

I believe these are all original from a 2nd Gen Bally Freedom EM Pin. These came in a box of mixed up plastics that I acquired. These are used, some are little warped, and the plastic is slightly yellowed. As is, includes shipping. $40 Paypal-FF, $60 Paypal-G&S M-1330-137-2 M-1330-137-3...

I'm wanting to buy or trade for an OEM CPU board from a 2-stack Donkey Kong. TKG4-1*-CPU Any condition, non-working is great. Damaged or tons of chips missing is also fine, as long as the PCB itself is intact. I plan to remove all the components from this board and use it to create a replica...

I recently requested a quote for a set of 3 DK JR proms. The cost of bipolar proms is definitely higher now than last time I checked. On a pinball soundboard, I have gotten away with using a 2716 Eproms to replace a bipolar prom. I was just curious if anyone had tried that? Are they too...

Don't get too excited. I'm just interested in the discussion. I see all kids of bootlegs from the 80s, and the circuit board is pretty well documented at this point. If someone were to build a modern Donkey Kong PCB with identical gameplay and audio, what would you change? I'm not...

I've been playing around with a DK Jr board that has a LOT of problems. It's a pretty rusty survivor, and I've already found quite a few failed logic chips. Luckily I have a known-good DK jr board I can compare with, and it also allows me to pair a known good VIDEO board with a known bad CPU...

I have a Sanyo EZ20 that appears to have been kitted to invert the video like a normal monitor. I'd like to undo it. I found these instructions: https://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=info&page=vidinvrt.txt I see that the original R213-R215 is 15k in the schematic, but...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7828932/

I wanted to throw out an idea and ask if anyone can point me in the right direction. I'd like to build a device that will interface with my RiddledTV EZ switchers to provide a customizable video menu of games. 1. It would perform sort of like retro-pie (or the BitKit) with a menu and...

If anyone has a Baby Pac-man with this PCB board in it, could you please tell me what colors the pinouts are?

I was today years old when I learned that the 12V pins on Donkey Kong (2board) and Donkey Kong Jr are not actually connected to anything. (Well, I guess they connect to a small ceramic capacitor, but that is useless) There are locations on both boards to connect an audio amplifier that were...

I bought this PCB thinking I would just return it to the DKJr game, but I'd now feel bad doing that. Many have stated that this should be used to produce a multi-board. I'm not very interested in doing that, but I don't want to undo this board if someone else would like to do it...

Bb1nksRfq0k These are the SMD chips I use for video multiplexing in many of my 2way switchers. The part# is CD4053BM, The ID# on all of the bad chips is 72BWQDZ-64 I thought they were fine, and they seemed to work fine, but have since discovered that they run much hotter than legit chips...

Fully working, includes Sound Board. Includes ribbon cable, but not the power cables for the sound board. Asking $250 plus shipping and Paypal Fees or via F&F This has been SOLD

Fully working game board and sound board PLUS sound power & ribbon cables, plus sound potentiometer **SOLD** Asking $200 plus shipping and PP fees or via F&F ALSO have: Dead MK T-Unit board (UE8 was burnt, plugged in backward, it probably has other issues) Non-working Sound board (sound is...