Message for thad at portal -- mail bounced

[Thad P Floryan]

Re: Wolf Paul's questions (my answers posted since they seem to be of general
interest) ...

Q: "1. Does a 3b1 PS fit into a 7300?"
A: It should.  Both supplies have the same mounting hole arrangement and appear
   to be the same height, so vertical clearance should be OK for either a 7300
   or 3B1 case.

Q: "2. Are there 220VAC or 240VAC versions of these power supplies available
   (I just bought a 7300 and it looks like I will be moving to Europe
   at year's end.)"
A: The AT&T UNIX PC REFERENCE MANUAL (the book with all the schematics) has an
   appendix "International Version" in which is stated: "The electrical
   specification for this equipment is 220-240 volts."

  In general, many switching power supplies have a single jumper that permits
  primary operation on either 120VAC or 240VAC.  Having just returned from the
  West Coast Computer Faire in which I was demo'ing the UNIXPC for the past 3
  days in the AT&T Computer Users' Group booth, I'm pooped and unable to open
  one of the machines right now to see if there IS a jumper on the UNIXPC's
  power supply.

  HOWEVER, rest assured that you can operate your UNIXPC in Europe using a
  step-down transformer (external device), and my original doubts concerning
  problems with a line frequency of 50 Hz have been cast aside due to the
  successful operation of a 3B1 by Jim Sanchez of SYTEK in Brussels since
  January 1988; his system has been (and still is!) operating 24 hours/day.
  If you'd like Jim's email (uucp) address (via SYTEK in Mountain View, CA),
  let me know; Jim enjoys correspondence and can tell you the mfr and model
  of the stepdown transformer he's using.

Q: "3. Do you have an address where one can order one of these babies?"
A: Although I'm not certain this is the same subcontractor who mfd'd the
   UNIXPC's power supplies, I have found this entry in one of my various
   buyer's guides:

        Power Systems, Inc.
        12 Tobey Road
        Bloomfield, CT  06002

        ph:  203/243-0357
        TWX: 710/425-8778

In case news has "expired" at your site, repeating the original info: 

The 3B1 power supply is mfd by Power Systems, Inc. and is their model PS 1610-1
(Convergent part number D-65-00056-1, Rev. B).  Its specs:

        90-130 VAC, 245 Watts, 58-63 Hz
        +5 VDC at 20 Amps
        +12 VDC at 5 Amps
        -12 VDC at 300 mA

The 7300 power supply is also mfd by Power Systems, Inc and is model PS 1569
(Convergent part number D-65-00042-00, Rev. E).  Its specs:

        90-130 VAC, 58-63 Hz
        +5 VDC at 20 Amps
        +12 VDC at 3.5 Amps
        -12 VDC at 100 mA

Thad Floryan [ thad at cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]