Ohio Scientific's Rescued...need help/info!

From: Bob Brown <bbrown_at_harper.cc.il.us>
Date: Wed Oct 9 06:59:01 2002

> > Last night I rescued two Ohio Scientific systems:
>
>Congrats!
>
> > A challenger C1P and
>
>Plastic or metal case?

I think metal, but I haven't examined it thoroughly yet
though..what's the difference (besides the materials used)?



> > A Challenger II (which was a MUCH bigger box, and had a matching big,
> > heavy dual 8" floppy cabinet).
>
>Blue/black or tan/brown?

tan/brown

What's the difference? I've seen many old ads showing the Challender
II's, but they always seemed to be the blue ones..how are the tan
ones different?



> > The haul also included an ADM-3A terminal (always wanted one of
> > these), and a dual 5 1/4" floppy cabinet (don't know which system
> > this goes to).
>
>I would like to see a picture of this. It's probably not OSI.
>
> > I got no documentation, no software or anything
> > (these were all picked up from a curb-side garbage pile!!)!
>
>Lucky, lucky lucky! Where?

Chicago suburbs.



> > Any pointers to documentation, software, specifications, etc??
>
>I have lot's of docs, etc. for OSI. OSI is the principle focus
>of my collection.


Do you have any of these docs online? I'd love to see some specs and
some docs for these systems as I start playing with 'em.

The C1P has a ribbon cable coming out of the side of the top, that
looks like it's intended to hook into some other board..any idea what
this might be for?
(it comes out of the right side of the keyboard).

thanks!

-Bob




> > I've read the stuff on a careful process to power-up an altair...does
> > this apply to these systems too (I don't have much in the way of
> > electronic test equipment or power supplies).
>
>OSI uses regulated supplies. Generally, they either work or they don't.
>I've never had one zap anything... but anyway, the 5 volt supply in the
>C1P is easily disconnected from the main (and only) board. Put a dummy
>load on it and check. 4.7 to 5.3 is cool.
>
>The Chal. II will probably have a PowerOne supply (again, very reliable
>in my experiance). Pull all of the cards from the "fatherboard" (you'll
>need to anyway, just to reestablish contact) (the order of the boards on
>the bus does not matter) and put dummy loads and check voltages on the
>following pins (counting 1 to 48, top to bottom):
>
>23 - +12
>24 - -9
>25 - +5
>26 - +5
>27 - gnd
>28 - gnd
>
> > Man...I hate to think of these classic's going landfill...... gotta
> > save 'em all!
>
>Contrats again!

bbrown_at_harper.cc.il.us #### #### Bob Brown - KB9LFR
Harper Community College ## ## ## Systems Administrator
Palatine IL USA #### #### Saved by grace
Received on Wed Oct 09 2002 - 06:59:01 BST