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I was wondering if it would make business sense to plan a shipment to Europe (but not UK) for july instead of the USA as a way to see/wait how the tariffs mess is going to evolve?

Good news everyone, a colleague revised some of the soldering on the NEO-BUF repro — the castellated holes were not easy to solder — and now the board boots! ٩(^ᗜ^ )و ´- Big thanks to @ack, @channelmaniac, @ShootTheCore and @Neo-Alec for all the tips, without you guys I wouldn't have been able...

Thanks again @ack, I'll report back...

@ack, dude! Amazing! As you predicted, pin 159 in the NEO-GRC2 was loose, color me impressed. Now it's soldered to the pad, helped by a colleague as way beyond my skill level, and I verified with a multimeter to exclude shorts in the area. I had great expectations, but now unfortunately, when...

Oh, that's interesting. I only inspected the tracks, didn't thought to check the pin connections. A colleague suggested to reflow the RAM chips before swapping them...

Yes, IIRC there are few pixels that change in a vertical pattern, it's not a static screen.

OK, I'll report back in a few weeks if I can source the chips in Europe... ദ്ദി( ˶ˆᗜˆ˵ )

Good news, after replacing the NEO-BUF the board isn't stuck anymore to the "work RAM test" screen and now it goes to the crosshatch one when no card is inserted, so that's a win! ◝(ᵔᗜᵔ)◜ Unfortunately, with a card inserted, now it's stuck with another error: VIDEO RAM ERROR ADDRESS WRITE...

I was quite busy — or lazy, depending on the view — anyway I was able to test the chip with a scope today. On the A pins I was able to see a signal passing, but all the B pins (but B6) were stuck to a high value. According to the neogeodev WiKi the NEO-BUF is used as uni-directional buffer, so...

I re-read that thread again, the first time I missed the ROM board for titles that don't need special HW (Tecmo?). I'll stop derailing this thread and PM @Hammy directly if he still has a spare BIOS board... ^__^;

I don't have yet a donor PCB, but I definitely want to try it, maybe with Tetris TGM if it means it can be done without piggybacking EPROMs... ^__^;

No problem on my part, the G-Net is attached to a supergun, the SHA1sum of the raw file is 21452da5aefd701b666c495bd391ec9ab90b5a41 if you want to check with yours...

So, with this BIOS board I could convert, for example, a PCB with "Street Fighter EX2" to, let me see... "Strider 2", am I right?

Thanks @ShootTheCore for the suggestion, I'll check with an oscilloscope and report back...

The BIOS is stock. I'll probably use the occasion to put it in a socket...

I have a MVS MV1B base that is stuck on "Work RAM test" page, it was suggested to maybe replace the NEO-BUF as the dip switch has all the switches in the off position. Before heating the soldering iron, how can I check if the NEO-BUF is faulty and needs replacing?

New to the forum, but I would love to be added to the list...

Hi guys, I'm here mostly for nostalgic reasons, as a kid I was really fascinated with the arcade cabinet and I finally decided to get one, or maybe two, you know, why choose between tate and yoko? ^__^; I'm interested in the first wave of classics of the 80's — Pacman, GnG, Galaga — but to...