One of the 3 versions of this machine (the other 2 being the One-Per-Desk and one licensed by Australia Telecom called the Computerphone) the only differences between them were cosmetic, aside from the Oz one that had to have a different telecomms module of course. The Tonto used the smaller, cheaper, black&whiter version of the monitor since obviously telephone operators didn't need fancy hi-res colour! Hmm. Anyway, the difference with this machine is the messaging module that's in place of the Bingo cart in my ICL machine. I haven't delved into its inners yet, so watch this space.