Anyone here own a Speed Coin PCB?

Tornadoboy

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I know someone bought one off of Ebay in the recent past, I only missed it by a hair. :p

I'm experimenting with converting a Scramble board to SC with so far no luck, and I was wondering if someone whom has an original could take some pictures of it for me so I can see if there's any obvious differences? The few pics I do have make it look very much like a Scramble, but I don't have anything high-res to look at chip numbers or any pics of the bottom board.
 
Yeah I know but I kind of like it, although I can understand why it never made it into production, and I'd like to have some rare games in my collection. Scramble is not a bad game either but I get sick of it easy, and again I like rare stuff, and aside from that I'd like to gradually create a FAQ of board conversions that are confirmed to work and how to do them, Speed Coin is one of many I'd like to try.

What I've initially tried was a straight ROM swap using the MAME ROMs and going by their names for placement, my Scramble board isn't working right but with the original ROMs it ran enough that I could see it working in attract mode, with the Speed Coin ones it only seemed to show gibberish. BUT obviously a malfunctioning board isn't the best test bed for this kind of experiment, so I need to fix that first before I write this off as a failure, and I haven't swapped the color PROM yet so I need to try that too before I give it up and move on.

BTW did your conversion work? And did you need that stupid external Konami security sub-board with it or can you just plug a Z80 processor in its place? I have a spare Super Cobra board around but it doesn't have that board, I was going to write that one off as just for parts but if it'll do Speed Coin with just plugging in a standard processor then all the better!

Other stuff on my rather ambitious and probably delusional to-try list:

- Venture to Teeter Torture conversion / have all the parts lined up now, just need to wire a harness and confirm the original boards work, then give it a whirl. If successful design side art, bezel, marquee and build it a cab
- Figure out how to get around protection PAL on Sente ROM cards as to convert them to like Snake Pit, Stompin, etc :D
- Double Dragon to Dangerous Dungeons conversion / I'm very doubtful on this as I'm pretty sure the later's kit needed a security chip
- Get one of the two millions sets of Victory boards I have working then design it a mini-cab
- Looping to Sky Bumper conversion / pending no protection devices they're so simular they must use the same boardset
- Road Blasters to Marble Madness conversion / supposedly both games use the same Slipstick protection chip, I plan to find out!
- Converting Spectar to Side Trak by building it's sound board from scratch, which isn't particularly complicated
- Circus to Rip Cord conversion / have all the parts, same deal as the Teeter Torture experiment except I'll have to make PROM to EPROM adaptor sockets
- Figure out and design a solid state conversion kit to substitute for the crappy cassettes of DECO boards
- Qix to raster Taito version of Black Widow / supposedly they used the same board, just anxiously waiting for the ROMs to turn up!
 
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Did it work? And did you need that stupid external Konami security sub-board with it or can you just plug a Z80 processor in its place? I have a spare Super Cobra board around but it doesn't have that board.

This is something I did well over a decade ago... so I don't recall if it all worked correctly. I remember trying several ROM swaps on a Super Cobra board (and possibly an Amidar?). Some failed to boot, others came up but wouldn't play quite right. They always seemed to make some little mapping change that made conversion a bit more of a hassle. Give it a shot, nothing to lose.
You don't need that external Konatec box for anything.... There are ROMs for all those Sternomi games that work with a plain old Z80.
 
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