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Article #2225

Re: More MVII Hardware Help

#2225
From: Jim Durham
Date: Mon, 15 Oct 1990 17:47
29 lines
1695 bytes
In article <cNy2q3w163w@zl2tnm.gp.govt.nz> don@zl2tnm.gp.govt.nz (Don Stokes) writes:
>terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr) writes:
>
>> In article <Bw7Zq1w163w@zl2tnm.gp.govt.nz>, 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
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!know!sdd.hp.com!usc!rutgers!rochester!pt.cs.cmu.edu!dsl.pitt.edu!pitt!jcd
References: <1990Oct13.112742.612@spcvxb.spc.edu> <cNy2q3w163w@zl2tnm.gp.govt.nz>

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Path: arc1-ca.pugleaf.net!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> <cNy2q3w163w@zl2tnm.gp.govt.nz>
Reply-To: jcd@vax.cs.pitt.edu.UUCP (Jim Durham)
Organization: Univ. of Pittsburgh Computer Science
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