It appears that most of my ESDI drives, including MAXTOR, Miniscribe,
CDC/Seagate, and Micropolis, all seem to use 150-ohm resistors. I thought I
had at least one around here that used the 220/330 type.
Dick
-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, December 15, 1999 7:14 PM
Subject: Re: An easy one (after that db9 debacle!)
>> This one should be easy. I've got an ESDI drive, I know that at one time
it
>> had termination resistors in it, I know that I pulled them out, I put
them
>> into my "drawer of misc resistor packs", they are effectively invisible
:-)
>>
>> What is the resistor values for the term pack? 220/330?
>
>Almost certainly. May be marked 221331 (==22*10^1, 33*10^1). I would
>guess the pinout is one of the standard ones (SIL with the common pins at
>the ends, DIL with the common pins at the top right and bottom left
corners)
>
>The latter assumption is not always valid. I once worked on a floppy
>drive that was corrupting disks. The cause was the termination resistor
>pack. It was a 9 pin SIL, but instead of having the common pin at one end
>(marked by a dot), it had it in the middle. The correct resistor pack was
>symmetrical, therefore. Somebody had put in a normal resistor pack, and
>the result was that all sorts of signals got coupled together. Finding
>that fault was entertaining to say the least.
>
>-tony
>
Received on Wed Dec 15 1999 - 23:31:41 GMT