Using a MDA monitor on a CBM

From: Baltissen, GJPAA (Ruud) (
Date: 2003-11-20 12:06:45

Hallo allemaal,

To test a loose motherboard, I often unscrew the monitor of my own 8032-SK
to be able to use it. But this monitor is not designed to be used stand
alone so I had the idea of using my MDA monitor instead. So I used Nicolas's
idea of using a 74LS86 to be able to invert the signals.

Unfortunately the result wasn't what I expected:
- either you could read just the first 5 characters of each line at the last
part of the screen
- or (after inverting H-sync) read everything except the first 5 chars.
Turning the H-pos knob just shifted the image, nothing more.

OK, there are fifferences between a MDA monitor and a CGA monitor but I
haven't an idea which ones. 
Anyone an idea what I must do to get a normal picture?

Thanks !!!

   / __|__
  / /  |_/     Groetjes, Ruud
  \ \__|_\



De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij overgebrachte virussen.

The information contained in this e-mail is confidential and may be privileged. It may be read, copied and used only by the intended recipient. If you have received it in error, please contact the sender immediately by return e-mail; please delete in this case the e-mail and do not disclose its contents to any person. We don't accept liability for any errors, omissions, delays of receipt or viruses in the contents of this message which arise as a result of e-mail transmission.

       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail pre-2.1.8.