[ayuvar]

This kind of closes the loop on an interview I read a long time ago in a magazine.

When Blizzard went to make the Mac (System 7) port of Warcraft 1, the guys that were interviewed about it mentioned that the port was relatively easy because the game code was relatively insulated from the OS and all they had to do was update the OS-side code and keep the game logic running in "a thread." (their words)

Probably this virtual machine model was continued at least to Warcraft 1, which makes a lot of sense for a shop that was used to doing console ports of their PC titles at the time.