MegaDrive/Genesis Multitap schematics wanted...

[CrazyIcecap]

Hi! I am looking for the Sega MegaDrive/Genesis 4x Multitap schematics....any chance?

[SavannahLion]

Wow, I haven't thought of those in years.

I may be wrong, but I might have one archived deep deep deep inside one of my old hard drives. I don't think it's the schematic though, I think it's the signal input/ouput tables and a chip description. Let me see if I can find it.

IIRC, it's really just a multiplexer that stages the signals from the four controllers into the Genesis. I think this was why it doesn't work correctly with the six button controller and why some games require their own multitap (different multiplexing).

[SavannahLion]

What do you need it for? Are you looking for a particular multitap or just any model?

[CrazyIcecap]

I just got the game "Wimbledon", and there is a picture of a 4-Port Multitap on the case. I have a retrogamer-meeting next month, and we want to play that game in 4-player-mode

[SavannahLion]

http://cgi.ebay.com/Original-Sega-Brand-Genesis-5Player-Multi-Tap-Multitap-/170529588233?pt=Video_Games_Accessories&hash=item27b45b0409

 

Wow... yeah... PBJ  is right. This isn't a circuit that just anyone can build and debug in a short time.. Well, not with my own skills. You might have a better grip on EE. Probably better to buy one off of eBay and use that.

In any case, http://www.raphnet.net/divers/genesis_multitaps/index_en.php is where I think the document came from. There's a picture of just how convoluted one of these multitaps is.

http://www.raphnet.net/divers/genesis_multitaps/multitap_mk1654_3.jpg

[Frigo]

You may want to ask around on the Sega-16 message boards - lots of technical people well versed in all things Sega over there.

[CrazyIcecap]

Thanks for the picture. Didn't know they used ASICs for those...but if anyone could provide me with informations, how these multitaps are working, i can try to implement that in TTL or program a µC.

You may want to ask around on the Sega-16 message boards

Where is that?

[SavannahLion]

Thanks for the picture. Didn't know they used ASICs for those...but if anyone could provide me with informations, how these multitaps are working, i can try to implement that in TTL or program a µC.

You may want to ask around on the Sega-16 message boards

Where is that?

sega-16.com