Path: utzoo!attcan!uunet!know!sdd.hp.com!usc!rutgers!rochester!pt.cs.cmu.edu!dsl.pitt.edu!pitt!jcd From: jcd@pitt.UUCP (Jim Durham) Newsgroups: comp.sys.dec Subject: Re: More MVII Hardware Help Message-ID: <8857@pitt.UUCP> Date: 15 Oct 90 17:47:06 GMT References: <1990Oct13.112742.612@spcvxb.spc.edu> Reply-To: jcd@vax.cs.pitt.edu.UUCP (Jim Durham) Organization: Univ. of Pittsburgh Computer Science Lines: 29 In article don@zl2tnm.gp.govt.nz (Don Stokes) writes: >terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr) writes: > >> In article , don@zl2tnm.gp.govt.nz (Don Stokes >> > I just pulled my MicroPDP-11 (11/73) to bits, and located the power >> > harness...(stuff deleted) > >> Winner! >Oh wonderful..(stuff deleted) > >> You'll get blackening of the +5V (red wires) at the connector body. You may >> also get discoloration of the connector pins. > This is pretty simple physics..Power (read: Heat) = Volts times Amps. In my case, 1 volt drop times , lets say, 20 amps of current = 20 w of heat. The trick is to keep the voltage drop down. My experience with these "Molex" style connectors is that they are not good for high-current applications. Even if DEC has a new whiz-bang style replacement, the pins on the power supply and bus are still the same old tinned junk. My original comments still apply. Keep 'em clean! > >Don Stokes, ZL2TNM / / Home: don@zl2tnm.gp.govt.nz Hi Don, I'm W2XO (that's ham radio talk, for you bit-pusher-only types 8-) ). -Jim Durham jcd@vax.cs.pitt.edu | durham@w2xo.pgh.pa.us