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Now you see it... Now you see the other... I ordered "20 AMD 27C400 EPROMs" and received 16x Hitachi HN27C4000G-10, 2x Hitachi HN27C4000G, and 2x ST MX27C4100... Did OK on the lot and they came blanked. It did take some work to get all the paint off though. Overall, was a good buy...

Hey folks, Had a bit of a bitch of a Crime City on the bench. Two stuck inputs and a sound subsystem in watchdog. Fixed it, but in the midst of doing that I reversed the pinouts for two of the customs: TC0220IOC - I/O Controller IC TC0140SYT - Sound Subsystem Controller IC The I/O controller...

Had an odd one here... "Voltage drops from 5.1 to 3.5v when plugged in. Well, no short was found. Board booted to a white screen that faded to black and back to white. Let it sit for a minute while checking the board with the thermal camera and it suddenly made noise making me just about jump...

Have a couple of PCBs for sale... Space Bomber: Japan region: $350 <SOLD!!!> Bells & Whistles: $350 PayPal accepted. Plus shipping from Texas. Both are in good working order: The Bells & Whisles PCB is labeled Twin Bee, but it appears during its life someone replaced the ROMs with the Bells &...

Had a PITA on the bench and got it fixed... Made a good one out of 2 bad boards. Both dead. Reprogrammed a bad ROM and was left with that one crashing left and right. Reflowed DSP/CPU chips and it stabilized but still crashed badly while popping up random errors about Bank 0 and found a missing...

Hey folks, Had a Sunset Riders on the bench for repair so while it was there I pinned out the protection custom. Hope it helps you on your repairs. RJ

Hey everyone, <SOLD OUT!> I have 6 I have 4 I have 3 I have 2 I have 1 tested and populated daughterboards with Q-Sound chips ready to go to new homes. $100ea plus shipping from 75077

Hey everyone, Big board sale time! I have over 100 PCBs in multiple bins, wrapped up in anti-static bags, tested and ready to go. Prices and bin numbers listed in the linked Google Docs. PayPal and cash accepted. Will ship to the 50 states + PR via USPS Priority Mail. Local pickup in the...

I need a copy of the ROM "775F08" at K22 to repair a Super Contra. I've already replaced a few dead Fujitsu logic chips, a 7407, a 2016 SRAM, 3 corroded EPROM sockets and 1 EPROM... and 1 custom. The file can be found in the scontraa.zip MAME file (that I cannot find using Google) or on a Super...

Posted a 2nd video in the series of Circuit Basics tonight on YouTube. This one on Clock Circuits and it covers an overview, sample circuits, clock dividers, and troubleshooting. It’s based on the series of posts I have on the Aussie Arcade forum to help folks understand the circuits in their...

The name is perfect as they are hell to work on. I had 2 here that were partially parted out... One had no ROMs and all the sprite and background ROM sockets corroded up plus some damaged traces under the dual port RAM. The other had one bank of 2148 Video RAM and a 74ALS163 removed and traces...

Hey everyone! Just thought I'd pop in over here and have some fun. I like the mods y'all are doing and have installed some of them for a couple of folks. I'm just a board repair nutter, myself - a guy with too many hobbies. :D Raymond