Even though the Electron was a pretty poor machine compared to the BBC I'd ego so far as to say that ElectrEm Future a better option than Horizon for playing old Acorn games on a mac. This is also being actively developed; a beta version 0.2 is available from the ElectreEm Yahoo! group that supports ADFS, Slogger Turbo and the Plus 1. My eternal gratitude to the programmer who brought this to the mac.