Well I posted this on SpritesMind, but I'd thought I'd post this here too. I decided to make a simple preemptive context switcher on the Genesis, based on some code I already had for x86 and some guidelines I found a while ago. http://idisk.mac.com/pietro10-Public/mtask.zip It just flashes between a and b every second or two. Not really much to say :D Comments are welcome, source code is included. Read the main source code file for the thanks. =P