mGENp...take two!

Ness · Post by **Ness** » Mon May 14, 2007 6:58 am

Has anyone been able to rig up a radica rom so that if I flip a switch one way, I can play the original rom, and if i flip it the other way, I can play a sega genesis cart game?

Hope I didn't confuse anyone with this question...

EDIT:::
This is officially my WIP thread! About 2 years ago, I started working on this but wasn't successful because the SF2 radica has completely different pinouts and that cart was not working. Now, I am using a sonic 1 radica and working on this project again.

Post by **Skyone** » Mon May 14, 2007 8:44 am

Hook both of the carts (Radica ROM and Genesis Slot) directly to the board as you would (Genesis Slot in parallel) and install a switch that controls the voltage between them. One position, the switch delivers voltage to the ROM, the other position, it delivers to the cart slot. Or you could use the switch to control other vital lines such as ground or CE.

http://benheck.com/phpBB/viewtopic.php?t=14825
http://benheck.com/phpBB/viewtopic.php?t=14827
http://benheck.com/phpBB/viewtopic.php?t=6205

Ness · Post by **Ness** » Mon May 14, 2007 9:45 am

Thanks! It is possible which is great to know. Gotta throw the grounds onto a switch basically. However, another member was claiming that the cart cancels out the rom so I'll try that out first. If not, no big deal.

Thanks Skyone!

Post by **CronoTriggerfan** » Mon May 14, 2007 10:55 am

Well if you do have a Genesis cart slot hooked up, it will boot directly to the Genesis game if there is one plugged in, but if there's no game inserted, then it'll automatically boot the built-in games. So why do you need a switch?

CTFan

Ness · Post by **Ness** » Mon May 14, 2007 11:00 am

That's what I wasn't sure about in the beginning. It's all good now, I'll be able to go from here now with the wiring process.

Post by **CronoTriggerfan** » Mon May 14, 2007 11:06 am

Ness wrote:That's what I wasn't sure about in the beginning. It's all good now, I'll be able to go from here now with the wiring process.

Awesome, good luck man!

Where will you be reporting your progress, in this thread?

CTFan

Ness · Post by **Ness** » Mon May 14, 2007 11:24 am

I was gonna make a new thread, but ya know what? This thread will be better!!! I'm taking pictures already of what I have done so far (not much really). I'll get them up later.

Post by **gannon** » Mon May 14, 2007 11:40 am

Yep, my radica died when I tried desoldering/cutting the rom CE line

Ness · Post by **Ness** » Mon May 14, 2007 11:47 am

Yeah, I'm definitely not cutting that off. Just gonna add the cart on top of it. Currently, I have the screen and the radica running off of 4AA's perfectly. I tested out the rom and it works. Now, I need to get the cart slot going next. Once complete, if all goes well, I can connect the controller and finish up the casing! =)

Ness · Post by **Ness** » Mon May 14, 2007 12:01 pm

This was an issue I had before...

The four three circled spots.

A21 and A22....where do they connect to???????????

!OE and !CE_L - Just connect them to OE and CE? or is something else supposed to be done there?

Ness · Post by **Ness** » Tue May 15, 2007 10:26 am

.:Bump:.

Can anyone help out with this one???

Ness · Post by **Ness** » Thu May 17, 2007 6:26 am

Bump! I know someone knows this one.

Ness · Post by **Ness** » Thu May 17, 2007 2:44 pm

I couldn't wait anymore so I said screw it and tried it out anyways. As far as I am aware of, it works. When the game is in, it goes to the game and when the game is out, it loads up the radica.

I need to get another sega cart and test out another game because the one i have been using, i am not sure if that game is broken or not. I'll get another one tonight from home and try it out in the morning.

Everything is running off of batteries only so I am happy about that. Time to work on the controller tomorrow...this will be fun, especiall trying to get all this crammed into the GameGear case.

Ness · Post by **Ness** » Fri May 18, 2007 11:38 am

I f***** up a trace...gotta get a new one and start over AGAIN!!! =(

Gonna have to hire extra help on this one. Oh BEEEEEEEEEEEEEEEEENNNNNNNNNNNNNN!!!