Masscomp machines

Anyone out there got any info on Masscomp machines (or own one)? I found one the other day at BP (in something of a sorry state) but info on the 'net seems pretty scarce. Rumour has it that they ran some flavour of real-time Unix, and that multi-cpu machines were available - that's about all the good ol' Internet has to offer, at least according to Google. This particular one doesn't have a model number on the front, but the sticker on the back implies it's a 'mwb515'. I'm particularly after a keyboard photo right now - I've got the system unit and monitor, but there's no keyboard with it. Hopefully it's either in the 'unknown keyboards' pile or has been accidentally tidied away in a different pile of hardware :-) Hmm, it presumably has a mouse too, which presumably plugs into the keyboard as I didn't see an obvious mouse port on the back of the machine. cheers, Jules