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_at_ccp.com [mailto:ghldbrd_at_ccp.com]
Sent: Thursday, August 28, 2003 2:15 PM
To: cctalk_at_classiccmp.org
Subject: Re: Osborne 1 monitor questions
-----Original Message-----
From: Dave [mailto:dfnr2_at_yahoo.com]
Sent: Thursday, August 28, 2003 2:03 PM
To: cctalk_at_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
Received on Fri Aug 29 2003 - 08:26:13 BST