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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.

I have it. It is an hardware mapper to switch between ROM on successive power ups. Dumped separately they are regular roms.

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?

There's no switch, it changes automatically on a power-off power-on cycle.
I'll try to take a picture someday.

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.

My Game Gear gets sad if I turn it off and on quickly

Here's a photo of Sonic 2in1 as requested.

Sonic 2 in 1.jpg (619.54 KB)

Thanks for the pic. I was wondering if the cart even exists. Sort of weird how the cartridge switches between games.

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.

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You can see that this was originally made for Sega Genesis/Megadrive, but could easily be used in any console with a reset pin on the cart-edge.

7473int.png (42.71 KB)

aaaa

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.

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?

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.

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.

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.

It's already dumped, but is identical to the separate cartridges so there's no point releasing it.

can you give me a link to download it

Tom wrote

My Game Gear gets sad if I turn it off and on quickly

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.

Author	Message
MathUser Joined: 19 Jul 2008 Posts: 4	Sonic 2-in-1 (was: Undumped Sonic game gear game..) Posted: Sat Jul 19, 2008 5:15 pm
MathUser Joined: 19 Jul 2008 Posts: 4	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.

Bock Site Admin Joined: 08 Jul 2001 Posts: 8296 Location: Paris, France	Posted: Sat Jul 19, 2008 7:04 pm
	I have it. It is an hardware mapper to switch between ROM on successive power ups. Dumped separately they are regular roms.

MathUser Joined: 19 Jul 2008 Posts: 4	Posted: Sat Jul 19, 2008 11:31 pm
MathUser Joined: 19 Jul 2008 Posts: 4	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?

Bock Site Admin Joined: 08 Jul 2001 Posts: 8296 Location: Paris, France	Posted: Sun Jul 20, 2008 9:03 am
	There's no switch, it changes automatically on a power-off power-on cycle. I'll try to take a picture someday.

Maxim Site Admin Joined: 19 Oct 1999 Posts: 13548 Location: London	Posted: Sun Jul 20, 2008 11:15 am
	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.

Tom Joined: 16 May 2002 Posts: 1211 Location: italy	Posted: Sun Jul 20, 2008 12:53 pm
Tom Joined: 16 May 2002 Posts: 1211 Location: italy	My Game Gear gets sad if I turn it off and on quickly

Brynaldo Joined: 02 Apr 2005 Posts: 224	Posted: Sun Jul 20, 2008 7:27 pm
Brynaldo Joined: 02 Apr 2005 Posts: 224	Here's a photo of Sonic 2in1 as requested. Sonic 2 in 1.jpg (619.54 KB)

MathUser Joined: 19 Jul 2008 Posts: 4	Posted: Mon Jul 21, 2008 7:29 pm
MathUser Joined: 19 Jul 2008 Posts: 4	Thanks for the pic. I was wondering if the cart even exists. Sort of weird how the cartridge switches between games.

MathUser Joined: 19 Jul 2008 Posts: 4	Posted: Sun Oct 12, 2014 2:19 pm
MathUser Joined: 19 Jul 2008 Posts: 4	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.

Jazzmarazz Joined: 17 Sep 2013 Posts: 140 Location: TC, MI	Posted: Sun Oct 12, 2014 4:42 pm
	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. 7473int.png (42.71 KB) aaaa

alexkiddinwonderland Joined: 27 May 2014 Posts: 9 Location: Portugal	Posted: Sun Oct 12, 2014 6:32 pm
	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.

bman78 Joined: 25 Mar 2016 Posts: 2 Location: Toronto	Posted: Fri Mar 25, 2016 3:26 pm
bman78 Joined: 25 Mar 2016 Posts: 2 Location: Toronto	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?

Bock Site Admin Joined: 08 Jul 2001 Posts: 8296 Location: Paris, France	Posted: Fri Mar 25, 2016 7:17 pm
	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.

Maxim Site Admin Joined: 19 Oct 1999 Posts: 13548 Location: London	Posted: Fri Mar 25, 2016 7:46 pm
	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.

bman78 Joined: 25 Mar 2016 Posts: 2 Location: Toronto	Posted: Fri Sep 23, 2016 9:33 pm
bman78 Joined: 25 Mar 2016 Posts: 2 Location: Toronto	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.

Maxim Site Admin Joined: 19 Oct 1999 Posts: 13548 Location: London	Posted: Fri Sep 23, 2016 9:59 pm
	It's already dumped, but is identical to the separate cartridges so there's no point releasing it.

enmanuel Joined: 27 Jan 2021 Posts: 3	i want to play it Posted: Wed Jan 27, 2021 9:20 pm
enmanuel Joined: 27 Jan 2021 Posts: 3	can you give me a link to download it

segasonicfan Joined: 05 Jan 2006 Posts: 333 Location: USA	Posted: Sat Feb 06, 2021 10:12 am
	Tom wrote My Game Gear gets sad if I turn it off and on quickly 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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