Radica problem

samuel_a15 · Post by **samuel_a15** » Tue Dec 12, 2006 6:02 pm

I got a couple of Street Fighter 2 Radica games and removed the ROM inside and connected a cartridgesocket to it (followed the pinout on benhecks site) but then I try a real genesis cartridge it doesnt work. I saw that the Radica uses 3.3volt and the memorychips inside a cartridge uses 5volt so I dont think it can work How have you anyone solved this? 3.3->5volt converter circuits on all the pins or?

bevo · Post by **bevo** » Tue Dec 12, 2006 6:26 pm

SF2 Radicas don't work.

Krepticor · Post by **Krepticor** » Tue Dec 12, 2006 9:49 pm

yes unfortunately I believe the SF2 radicas emulate...which is not what we want

Stick with the sonic 2 radicas and there will be no probs...

samuel_a15 · Post by **samuel_a15** » Wed Dec 13, 2006 9:56 am

Why doesnt it work? It has both Street Fighter 2 and Ghols and Ghosts and why use some different metod than what they use in the other radica games?

bevo · Post by **bevo** » Wed Dec 13, 2006 12:53 pm

Having desoldered the chip and tried it can be easily seen that the SF2 unit is much more complex. Its possible that some data lines could be muddled but I doubt it.

Krepticor · Post by **Krepticor** » Wed Dec 13, 2006 1:00 pm

Take this into thought...Both of those games were on different systems...and both are Capcom

Now take that into perspective...Two games that were easily ported across the board...then the same code similarities

That leaves way too much room for many other types of emulators...and so that is my simple explination from a simple mind (anyone who has half a clue please interject)

bevo · Post by **bevo** » Wed Dec 13, 2006 2:00 pm

Both were on the megadrive.

So why would radica spend more money on an entire new system with remarkable similarities to there other megadrive based system but use a non goac chip. It doesn't make sence.

The most logical reasoning based on the outputs of the existing globtops, the rom pinouts and the controller is that the system is still a GOAC. However the pinout are different or the rom chip has been modified to prevent modification / dumping. Possible as it might be a part of radicas licence with the software vendors to prevent their code from being extracted or to prevent it being a full megadrive.

Krepticor · Post by **Krepticor** » Wed Dec 13, 2006 2:51 pm

yea go with that...it makes more sense!

samuel_a15 · Post by **samuel_a15** » Thu Dec 14, 2006 3:56 pm

There must be a way to figure out the pinouts of the SF2 Radica. There are some logic gates on the bottom side of the PCB and I guess they use it for addressdecoding so I guess I need to go pass them to get the addressbus direct to the connector for access, but its hard to figure out all the address and datalines.

bevo · Post by **bevo** » Thu Dec 14, 2006 4:08 pm

I would like to as well but it quite difficult unless you know what your doing. I think someone got the specs for one of the chips and traced them back, maybe they changed chips. I think the tread is in forum 42 regarding the original radica.

tom61 · Post by **tom61** » Fri Dec 15, 2006 11:01 pm

What method did you use to determine the pin placement?

It seems quite likely the ROM chip may be rotated 180 degrees compared to the blue Radica, which would mean your cart slot would be wired backwards.

If you've checked that possibility, it may be that the A20 pin has been moved, as the pin is in different places in certain Genesis cart roms (according to Ben's first post on adding a cart slot to the Radica).

Ben's first post on adding a cart slot to the Radica:
http://benheck.com/phpBB/viewtopic.php? ... ght=radica

Post by **Triton** » Fri Dec 15, 2006 11:16 pm

if it is 180 degrees rotated, try putting the cart on backwards? lol worth a shot