Making SEGA Genesis cartridges

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pbj:
Thanks, Locke. The only thing better than reading this thread is getting your hands on some beautiful Genesis reproduction cartridges. :lol

I'm currently causing another price bubble on the auction sites. I need more Sega shells. Alternative is to buy reproductions from China but that feels like throwing in the towel.

:cheers:

pbj:
So, a little more action this weekend. First I split my games into SEGA vs EA shells and alphabetized each stack. I’m at around 150 games now.

A loved one has burned through a couple of clone Genesis consoles and I threw in the towel and bought him a “dead” one for $30 shipped with two controllers and three games.

The problem was quickly identified:

Two screws were missing from the case so the motherboard was shifting around whenever you plugged in the power supply. I took the entire thing apart, scrubbed and soaked and cleaned. Reflowed that bad power supply connector solder joint and replaced the missing screws. I also rubbed the case down with a layer of wax.

Next I was going through my games to give him a few I thought he would like. One of them was Tengen Ms Pac-Man that was oddly on a SEGA pcb. Wouldn’t boot. Reflowed everything, changed capacitors, cleaned edge connector, still nothing. So I found a YouTube video where he says that ROMs on Genesis blow internal gates if the carts are removed with the power on. The way to test this is to put your multimeter on diode check, put the positive lead on ground, and then check each pin on the ROM. You should get a consistent value on each non ground pin. For me it was 0.62V. Except for one pin. It wasn’t reading at all. The fix is to put a 1k ohm resistor from that pin to ground.

And it freaking worked!

Here’s the video:

https://www.youtube.com/watch?v=eCT4ZKV20RI

bobbyb13:
Beautiful rehab work on that console.
And in spite of my general feelings about the interwebs sometimes, the Ms. Pac repair proves that the internet is worth something.

Sweet.

pbj:
I, uh, bought 54 more games just for the shells. Thankfully they're actual SEGA shells this time around, so I can quit messing around with EA and those universal PCBs.

Would be really, really swell if someone else had a Genesis around here.

:banghead:

bobbyb13:
I feel like I should buy one just so I can justify buying some repro cartidges and fueling this glorious mayhem.

:)

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