Sonic 3 terrority lock plus Geney 3 question?

hello again, does anyone know the terrority lockout code for the JAP version of Sonic 3?

Also, I heard that the Game Genie doesnt work on a Genesis 3? Say it aint so!!!!
I don't know if Game Genie works on Genesis 3, but the 32x and Powerbase Converter don't, as the Genny 3 has no z80 processor, which also means, most games don't work period.

Genny 3 = El Cheapo


Staff member
I don't know if Game Genie works on Genesis 3

I've heard reports that it doesn't, but can't confirm it myself since I don't have a Genesis 3 handy.

the 32x and Powerbase Converter don't, as the Genny 3 has no z80 processor, which also means, most games don't work period.

The Z80 is almost certainly there (sound would be rather lacking otherwise) - what's not there is SMS/M3 mode, which is what most Genesis copiers and the Power Base Converter depend on. There's reported to be at least one Genesis game that doesn't work on it: Gargoyles (for more or less the same reason that it doesn't run on most emulators, I'm told). The incompatibility with 32X is probably due to missing control signals on the cartridge slot, but these aren't likely to affect normal games (apart from, perhaps, Phantasy Star 4 and Beyond Oasis / The Story of Thor, which depend on a rarely-used feature of the cartridge slot).

As for the territory lockout patch for Sonic 3, I'll hopefully dig in and see if I can find it tomorrow. If I don't mention in after a few days, feel free to bug me about it via email.
I don't think it'd be possible to remove the z80 from the genesis architecture and still keep most games running properly. Quite a few games poll the z80 every now and then and if they don't get a response they'll just hang waiting for it.


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it is confirmed, by many. the Genesis 3 does not have the z80 chip.

And how did "many" come to the conclusion that it's missing? The indications listed on the linked page are dubious at best:

1. Unable to run the MS convertor as it needs the Z80 chip which is the brain of the SMS.

The Nomad can't run in SMS/M3 mode either. This has to do with certain VDP and bus arbitration capabilities and does not require the Z80 to be missing by any stretch of the imagination.

2. Unable to run Game Genie, the Z80 must have played a role in the use of this for code break ins.

This statement is logically pretty broken; combined with the initial line, it basically says that Game Genie must use the Z80 because Game Genie uses the Z80.

3. Unable to run special games such as Sega's Virtua Racing, which again uses the Z80.

If Virtua Racing doesn't work, it's probably due to missing or altered signals on the cart slot; the chunk of DRAM and coprocessor on the cart almost certainly have more to do with any compatibility issues than some unspecified "special" use of the Z80.

The rather glaring problem with this text is that it seems to be based on a perception that the Z80 is some archaic relic of past legacies untouched by all but the most privilieged Genesis developers, when in fact it's at the very core of the Genesis sound system and interfaces quite a bit with the rest of the system. If the Z80 was missing, it would be more than a few "special" games that didn't work.

It is likely that the Genesis 3 doesn't have a "Z80 chip" as such - there's no sense in putting something like that on its own chip if system-level integration is feasible. This does not mean that there is no Z80 any more than your PC not having a "serial port chip" means that it lacks serial ports.


Staff member
I guess my edit probably missed you. My point is that you can't just open up a Genesis 3 and look for a Z80, because you can't see inside the dice of all the chips.
got a Flashable cartridge, and know how to program z80 ASM and 68000?

try using the z80 for something. see if anything comes out of it.
The Genesis 3 is a Genesis-on-a-chip console. All the old seperate components (main ones being the 68k, z80 and vdp) are a part of the main chip. That's why it's so small and why some of the features are missing that would make it a full genesis of sorts. Just like the SCD slot some of the cart pins (the rarely used ones) were not connected to save on input pins on the chip. If both were included, the chip would have another 50-60 pins on it and that would remove any significant advantage it had over seperate components.

The main reason for the incompatabilites is probably due to the fact that the gen-on-chip design is based off of the original chips but most likely includes a equivalent implementation of the original chips. As such less frequently used feature may not function the same or at all.

The exact same thing applies to the NES-on-chip that alot of those hk consoles are based on. What used to be alot of seperate processors are now in one single chip.

I can't say for sure but the nomad and megajoy (the portable airline version of the genesis) might use the gen-on-a-chip concept too.