Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.BERKELEY.EDU Path: utzoo!decvax!ucbvax!info-vax From: phil@RICE.EDU (William LeFebvre) Newsgroups: mod.computers.vax Subject: Re: Max amps summary Message-ID: <1616.phil.Dione@Rice> Date: Fri, 6-Dec-85 17:34:56 EST Article-I.D.: Rice.1616.phil.Dione Posted: Fri Dec 6 17:34:56 1985 Date-Received: Sun, 8-Dec-85 02:48:12 EST Sender: daemon@ucbvax.BERKELEY.EDU Organization: The ARPA Internet Lines: 25 Approved: info-vax@sri-kl.arpa > On page 466 of the VAX Hardware Handbook (1982-83 edition) in appendix K > It says that the power available is: > 25.0 amps at +5 v > 2.0 amps at +15 v > 3.5 amps at -15 v I suspect that either the publication was in error, or the reader was not very thorough. I don't have an 82-83 edition of the Hardware Handbook handy, so I can't scrutinize it myself. BUT, I do know that the power available on a *780* unibus is 25.0 amps at +5 V. I also know that the power available on a *750* unibus is 32.0 amps at +5 V. Two curious things about the hardware handbook. First, it is a description of all VAX hardware. Sometimes it is easy to get lost in the book and not realize that you are reading a "780 only" section instead of a general section or a "750 only" section. The other oddity is that at first, the Hardware Handbook only had to describe the 780. So it is possible that when DEC revised the book to include 750's, they forgot to clarify all the sections (like the one telling you how much power there is on a 750 unibus). William LeFebvre Department of Computer Science Rice University or, for the daring: