ICUS UnixPC hard disk mod.

[Lenny Tropiano]

In article <1989Aug2.034418.12542 at rducky> jrp at rducky (JIM PICKERING) writes:
|>I just completed Lenny and Gil's modifications to add the second drive
|>on my 3B1.  Worked fine on the first try.  Great job guys.  I'll get to
|>the questionaire another evening.
|>
...
Thanks for the praise, from you, and all the others who have also
offered their thanks.  We're both glad that we were able to offer
such a service to the net, as well as our own machines :-)

|>I had a parts 7300 I bought some time ago and used the drive from it.
|>It is a Miniscribe 3425 (20MB) and did not have any drive select jumpers but
|>a set of dip switches.  Rather than guess which ones to set, I just made a
|>cable with a twist ala IBM PC's (lines 25-29), and it worked!  
...
Wow, that's good to know ...  I'm not much of a IBM PC'er, in fact I never
owned one myself :-)  I try to keep away from the MeSsy-DOS world.. 

|>I also found that if the second drive is powered down and the computer 
|> is not, the kernal is not happy.  
...
Yes, we found that out too, by the same means you did (turned off
the second drive and the system just went bonkers) ... ;-) 

|>Gotta disconnect the data/address lines too.
...
Yes, a little much of a pain, but with all your extra space now why would
you want to turn off the drive?  :-)

|>The whole project took all day, but I also gave it a thorough cleaning
...
That's about right, especially for those taking their time with it (which
is recommended!)

|>(there were enough dust bunnies to weave a rug and the case was quite
|>yellowed ... evil nicotine and grunge) and installed a 120v fan (seems
		    ^^^^^^^^
|>quieter than the 12v).  Couldn't find a source for a battery and holder,

Computers and lungs don't like the stuff ... neither do I, but who am I
to say, I'm not C. Everett Coop :-)  Yeah, I thought my 120VAC fan was 
quieter too ... but the specs say that it is noisier (according to the dB 
level)

|>Thanks again Lenny and Gil.  It is great to have some more disk space.
...
You're very welcome!   How did you partition your oodles of space? :-)

|>Now if I could only afford 2 of those 150MB CDC half height drives which
|>will fit in the case ...
|>
Me too!

-Lenny
-- 
Lenny Tropiano             ICUS Software Systems         [w] +1 (516) 589-7930
lenny at icus.islp.ny.us      Telex; 154232428 ICUS         [h] +1 (516) 968-8576
{ames,talcott,decuac,hombre,pacbell,sbcs}!icus!lenny     attmail!icus!lenny
        ICUS Software Systems -- PO Box 1; Islip Terrace, NY  11752