Osborne 1 monitor questions - test-drb@ccmp.vtda.org

29 Aug 2003

Dave,

What looks like the Osborne 1 video adaptor is available from Alltronics (TTL-Composite
video adaptor #92C024, $4.95) 

http://www.alltronics.com/computer_miscellaneous.htm

It plugs on the edge connector on the front panel, in place of the shunt that is normally
there.

I believe that the only voltage supply for the monitor comes from P9 by way of P5, the
edge connector on the front panel.

I once had a 9" Panasonic open frame monitor that I used with my O1. I just wired it
to a female edge connector socket that I used in place of the shunt. I also added a 100K
pot for brightness control.

Bob 

-----Original Message-----
From: ghldbrd(a)ccp.com [mailto:ghldbrd@ccp.com]
Sent: Thursday, August 28, 2003 2:15 PM
To: cctalk(a)classiccmp.org
Subject: Re: Osborne 1 monitor questions

-----Original Message-----
From: Dave [mailto:dfnr2@yahoo.com]
Sent: Thursday, August 28, 2003 2:03 PM
To: cctalk(a)classiccmp.org
Subject: Osborne 1 monitor questions

...
  Hello,

 Thanks to the help of several of you, I have, after
 reparing the power supply, been able to verify that
 the CPU is running, and using the .PDF service manual,
 am able to get a signal on the video pin (8) after
 replacing the contrast pot.  However, the monitor
 still produces no output.  I have a couple of
 questions: <snip>
...

 2) What's the simplest way to use an external monitor
 for testing? 
Wasn't there some sort of video adapter that plugged in where the jumper
was on the front panel.. ISTR it was a standard b/w NTSC monitor.  One of
the surplus electronics places in CA was selling said item for about $4 or
so.
...

 3) Does the monitor use the +12V line on the connector
 from the CPU board for all its power, including the HV
 converter? 
I'd have to check the schematic, but it sounds logical (sorry Spock!)
...

 Thanks,

 David.

Gary Hildebrand
St. Joseph, MO