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Sonic 2-in-1 (was: Undumped Sonic game gear game..)
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I don't think this game has ever been dumped:
http://info.sonicretro.org/Sonic_2_in_1 If anyone has it or a scan of the cart It would be nice to see. It's hard to find any info about it on the internet, I've only seen a couple mentions of it on a few websites. |
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I have it. It is an hardware mapper to switch between ROM on successive power ups. Dumped separately they are regular roms. | |
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So by hardware mapper, do you mean there is a switch somewhere on the game to choose what game you play? Also, could you take a picture of the cart if this is the case? | |
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There's no switch, it changes automatically on a power-off power-on cycle.
I'll try to take a picture someday. |
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This is a common way of making multi-games, a lot simpler than menus. There is a simple counter chip that selects the high address lines and it is incremented on startup; a capacitor allows it to retain its value for a second or two while the power's off. Thus you can cycle through games with the power switch and it resets back to the first one if you leave it off for longer.
I have somewhere a Game Boy pirate cart with 20 games set up this way. |
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My Game Gear gets sad if I turn it off and on quickly | |
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Here's a photo of Sonic 2in1 as requested.
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Thanks for the pic. I was wondering if the cart even exists. Sort of weird how the cartridge switches between games. | |
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So, the wiki could still use a full scan of the box. I finally found a good large pic of the cart on ebay.co.uk. Can Bock or someone else scan the front, side, and back of the box? Thanks. As a bonus you can post the scan on your website. | |
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I would like to see the board inside. I was working on a hardware switcher too, using a 74ls73 IC like maxim mentioned above. I never got to testing it however.
You can see that this was originally made for Sega Genesis/Megadrive, but could easily be used in any console with a reset pin on the cart-edge. |
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The Game Box series (TecToy) on Master System has this type of game switching.
Don't know how useful it is to you but I took some pictures of the PCB of a cart I have on eBay. |
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Sorry for reviving a dead topic xD
But I have a question.... If I were to find the Sonic 2 in 1 Game cart and dump it, would the roms be separated on their own, or is there a way to dump the entire cart and then be able to emulate the 2 games with emulators that can do the power cycle game switch? |
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You append the two roms together that would be the same as what's on the chip. Then up to the emulator to "simulate" the switch. Generally what people refer to as "Mapper" refer to any behavior expressed by the board so that would include it. | |
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I guess an emulator could detect the checksum and alternate between the contained ROMs. Few have the necessary power cycle UI, though. It's an extreme measure to emulate something essentially worse than just having the separate ROMs. | |
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Was the cartridge dumped yet? because I am seeing a bit of an update in the title of the topic. I am not seeing that rom in the releases section. | |
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It's already dumped, but is identical to the separate cartridges so there's no point releasing it. | |
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i want to play it
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can you give me a link to download it | |
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Not if you use my GG Power Board Pro upgrade...[available sometime in 2023 :'( ] But seriously though, rapid power switching is not a good idea on the old Game Gear power PCBs. I'm surprised they opted for that. |
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