Build your own H8 simulator!
Several projects appeared based around the Lego RCX and the Cybiko. This web page has links for a bunch of user generated H8 development tools for Cybiko's H8S and the Lego H8/300H based products.
This web page includes some interesting links to H8 disassemblers and GCC resources.
http://www.dbzoo.com/wiki/cybiko/cyemu
Created to go with the Cybiko Classic toy.
http://www.dbzoo.com/wiki/cybiko/classichardware
Project code is based on H8 simulator for Lego RXC
http://www4.informatik.uni-erlangen.de/~felser/RCXSimulator/
(note that this site hasn't been updated in a while, and the Cybiko is no longer in production.)

