[comp.os.cpm] Need info on Osborne-1 power supply?

niemi@astroatc.UUCP (Bob Niemi) (06/17/88)

Once again the Astec power supply in my Osborne 1 has gone south for the
winter without waiting for winter.  Thought I would try to fix it instead 
of shotgunning it this time, but I have no information, schematics, etc.
I would appreciate if someone could mail me a print, or tell me where to
get one.  

Also, I recall an article (in FOGHORN?) identifying the cause of
frequent power supply failures, but I can't find it in my limited
resources.  If anyone can help me I would appreciate it.  Thanks.

Bob Niemi, Astronautics, 5800 Cottage Grove Rd., Madison, WI 53716
Phone (608) 221 9001, Home (608) 592 3462,  ...uwvax!astroatc!niemi

wjc@ho5cad (Bill Carpenter) (06/17/88)

In article <1061@astroatc.UUCP>, niemi@astroatc (Bob Niemi) writes:
>Once again the Astec power supply in my Osborne 1 has gone south for the
>winter without waiting for winter.  Thought I would try to fix it instead 
>of shotgunning it this time, but I have no information, schematics, etc.
>I would appreciate if someone could mail me a print, or tell me where to
>get one.  

Sam's Photo-Facts now has a spinoff  called Sam's Computer Facts which
give complete schematics,   test  point    voltages, etc.   Most  real
electronics stores (like where  a  TV repairman or  Ham operator might
shop)  carry bunches of these  and can order any  they don't  have.  I
have a hazy memory of a note that Radio Shack now also carries them.

Yes, I know Sam's  has one for the  O-1.   Sorry I can't give  you the
specific number.  I think it cost $10-15.

-- Bill Carpenter         att!ho5cad!wjc  or  attmail!bill

wilker@batcomputer.tn.cornell.edu (Clarence W. Wilkerson Jr.) (06/17/88)

I bought a non-functioning Osborne I at a garage sale. Where
is a source of technical information ( schematics, etc? );
This one works as far as showing the initial prompt. However,
it flickers badly if the keyboard is attached, and will not
boot. Clarence Wilkerson

rusty@cadnetix.COM (Rusty) (06/21/88)

In article <1061@astroatc.UUCP> niemi@astroatc.UUCP (Bob Niemi) writes:
><question about osborne hardware info>

Also, in another, unrelated article, someone asks for hardware info on
the osborne 1...

Amazingly enough, the Osborne 1 is one of the few computers for which
you can get a Sams (r) Photofact (r) 'thingie'.  Complete schematics!

Go look in your local public library for this little gem.  The Phoenix
public library in Phx Az (not much use to you, probably.:-) had a complete
set of Sams Photofact (r).  If you are really lucky, your local library
will too.

Good luck.  BTW, did you put any sort of spike protection on the power
supply?  I put 2 or 3 MOVs inside the case, and never had any problems.

Also, I assume you know about the jumper which will make the serial
port be 600/2400 baud instead of 300/1200?  I mounted a switch on the
case so I could easily switch between 300/1200/2400 (who needs 600, 
anyway? :-)
-----
    Rusty Carruth	N7IKQ	DOMAIN: rusty@cadnetix.com
    Cadnetix Corp.		UUCP:   cadnetix!rusty
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