This is a new one on me and a curious one at that. A quick search of the internet found a small piece on http://en.wikipedia.org/wiki/Four-Phase_Systemsbut not a great deal and nothing on the company after they were sold to Motorola in 1981.
The machine we have here appears to be a small office machine; It has six serial ports on the back along with a 50 pin connector for an external disk drive. I’m guessing SCSI but I have no proof, I have no disk drive either.
Inside the case is a card cage but it’s a bit stranger than it first appears. There seems to be two buses in the cage. The two boards on the left have card edge connectors and both have 6809 processors. The three boards on the right have three row connectors with pins that look like connectors on a VME bus. One board has a Motorola 68010. The other boards seem to be RAM cards.
When I power the machine up the fan whirs and I can see a couple of LEDs glowing optimistically. I don’t see any activity on the 25 way D type at the back labelled “J1 RS-232”.