Forums

Sega Master System / Mark III / Game Gear
SG-1000 / SC-3000 / SF-7000 / OMV
Home - Forums - Games - Scans - Maps - Cheats - Credits
Music - Videos - Development - Hacks - Translations - Homebrew

View topic - Sonic 2-in-1 (was: Undumped Sonic game gear game..)

Reply to topic
Author Message
  • Joined: 19 Jul 2008
  • Posts: 4
Reply with quote
Sonic 2-in-1 (was: Undumped Sonic game gear game..)
Post Posted: Sat Jul 19, 2008 5:15 pm
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.
  View user's profile Send private message
  • Site Admin
  • Joined: 08 Jul 2001
  • Posts: 8296
  • Location: Paris, France
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Joined: 19 Jul 2008
  • Posts: 4
Reply with quote
Post Posted: Sat Jul 19, 2008 11:31 pm
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?
  View user's profile Send private message
  • Site Admin
  • Joined: 08 Jul 2001
  • Posts: 8296
  • Location: Paris, France
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Site Admin
  • Joined: 19 Oct 1999
  • Posts: 13548
  • Location: London
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Joined: 16 May 2002
  • Posts: 1211
  • Location: italy
Reply with quote
Post Posted: Sun Jul 20, 2008 12:53 pm
My Game Gear gets sad if I turn it off and on quickly
  View user's profile Send private message Visit poster's website
  • Joined: 02 Apr 2005
  • Posts: 224
Reply with quote
Post Posted: Sun Jul 20, 2008 7:27 pm
Here's a photo of Sonic 2in1 as requested.
Sonic 2 in 1.jpg (619.54 KB)
Sonic 2 in 1.jpg

  View user's profile Send private message
  • Joined: 19 Jul 2008
  • Posts: 4
Reply with quote
Post Posted: Mon Jul 21, 2008 7:29 pm
Thanks for the pic. I was wondering if the cart even exists. Sort of weird how the cartridge switches between games.
  View user's profile Send private message
  • Joined: 19 Jul 2008
  • Posts: 4
Reply with quote
Post Posted: Sun Oct 12, 2014 2:19 pm
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.
  View user's profile Send private message
  • Joined: 17 Sep 2013
  • Posts: 140
  • Location: TC, MI
Reply with quote
Post 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
7473int.png

  View user's profile Send private message Visit poster's website
  • Joined: 27 May 2014
  • Posts: 9
  • Location: Portugal
Reply with quote
Post 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.
  View user's profile Send private message
  • Joined: 25 Mar 2016
  • Posts: 2
  • Location: Toronto
Reply with quote
Post Posted: Fri Mar 25, 2016 3:26 pm
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?
  View user's profile Send private message Visit poster's website
  • Site Admin
  • Joined: 08 Jul 2001
  • Posts: 8296
  • Location: Paris, France
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Site Admin
  • Joined: 19 Oct 1999
  • Posts: 13548
  • Location: London
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Joined: 25 Mar 2016
  • Posts: 2
  • Location: Toronto
Reply with quote
Post Posted: Fri Sep 23, 2016 9:33 pm
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.
  View user's profile Send private message Visit poster's website
  • Site Admin
  • Joined: 19 Oct 1999
  • Posts: 13548
  • Location: London
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
  • Joined: 27 Jan 2021
  • Posts: 3
Reply with quote
i want to play it
Post Posted: Wed Jan 27, 2021 9:20 pm
can you give me a link to download it
  View user's profile Send private message
  • Joined: 05 Jan 2006
  • Posts: 333
  • Location: USA
Reply with quote
Post 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.
  View user's profile Send private message Visit poster's website
Reply to topic



Back to the top of this page

Back to SMS Power!