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No, find a Retrode if you can and rip your own cartridge ROM, then use that until Sega Releases Knuckles in Sonic 2 for Sale. The ROM from the Knuckles in Sonic 2 Disassembly WILL NOT WORK as we have recently discovered the Disassembly on Sonic Retro for Knuckles in Sonic 2 is severely unfinished, thus serves literally no purpose. Everything before is data from Sonic 2 or Sonic & Knuckles. This is where the UPMEM is located in the Knuckles in Sonic 2 ROM, and it spans to the end of the ROM. I plugged in my rom size and got a result I then gave the result to DaKingofDaCheckerz who then finished of the calculation and gave me the final offset: 0x30000 KiS2 ROM Size - 256KiB (Keibibytes) = ? MiB (Meibibytes) Until I joined the Sonic 3 Angel Island Revisited Discord Server and RawData I asked around and was told to find the right offset I needed to do some Math: (I know as when I tried going to the location they gave me the Hex Editor couldn't find it.) Second that it could be extracted with a HEX editor, and a post incorrectly detailing where the last 256KB started. What I did find was some info: First that the UPMEM was the last 256KB of the Knuckles in Sonic 2 ROM. This meant I couldn't lock on, I searched all over the internet, and couldn't find the UPMEM ROM. There was just one Problem- While I did have the Sonic & Knuckles ROM I was missing the required UPMEM ROM. I tried getting lock on to work for the sake of decluttering my ROM list and to play the games as intended in a purely digital format. However I'm guessing that wasn't the case when Genesis Plus GX was built, This means you needed a Sonic & Knuckles ROM and a UPMEM ROM to achieve Sonic 3 & Knuckles, Blue Sphere, and Knuckles in Sonic 2. Most people don't use this as often the full locked-on rom is available to download at any time from most ROM websites today. This seemingly is because some data for Blue Spheres and Sonic 3 & Knuckles is in the UPMEM aswell.Īnyone who uses either RetroArch (Genisis Plus GX Core) or the Genesis Plus GX Emulator will notice it has a Lock-On feature in the options menu with one of the options being Sonic & Knuckles. In Sonic 3 and 1's case this isn't necessary but this chip is still a requirement for these games to run the intended code.

However it's also involved in the process of checking the Lock-On game, namely to see if it should boot the Knuckles in Sonic 2 Data.

The UPMEM is a chip in Sonic & Knuckles responsible for patching Sonic the Hedgehog 2 with Knuckles' Art, His scripts, and the Level Design Changes made specifically for him. To create shortcuts to your favorite games! Join us! Our away homes on the interwebs: How to get Sonic & Knuckles UPMEM Rom Signup Login ModsĪnd creators, since 2001.