13 Feb
2006
13 Feb
'06
4:32 p.m.
dave04a at dunfield.com wrote:
They are the same.. I didn't know how familiar you were with
the OZ machines and some people don't know that the jumper has
to be there for the internal monitor to work.
John C. Ellingboe wrote:
I don't know about the executive, however on the O-1, all the jumper
does is connect the fingers on the top side of the board to the corresponding
fingers to the bottom side of the board. The jumper plug is the same size as
the cable connector for the small edge connector for a ST-506 type hard drive
- I made a jumper plug for one of my O-1's by just bridging such a connector.
A little bit if "filler glue" and a label made by photocopying the one from an
official plug, and it is almost indistinguishable from the original plug.
Dave Check the composite video out at the RCA jack on
the front panel.
The same signals drive two buffer ICs, the composite comes through
U22 and the internal CRT drive comes through u7. There needs to be a
jumper plug on the external CRT edge connector, beside the RCA jack,
in case yours is missing. That jumpers the CRT drive signals back
into the internal monitor.
I'm sure I've read that that jumper plug on the Osborne
(and hence possibly on the Osborne Executive) should only
be inserted or removed with the machine powered off.