If it's RGB, you'll beed an interface. If it accepts composite video, then you just take the CV signal from the input to the modulator and feed it via a cable to the monitor.
If you do a search around the Beeb websites, or perhaps the Beeb forum on www.stairwaytohell.com you should be able to find the Cub service manual. I may have one knocking around so I'll have a dig for it.
Failing that, the Philips monitor that was popular with Amiga users (the model escapes me ATM) is a good alternative and quite cheap at the minute.
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If it's RGB, you'll beed an interface. If it accepts composite video, then you just take the CV signal from the input to the modulator and feed it via a cable to the monitor.
Karingal has plans for that mod.
http://www.nvg.ntnu.no/bbc/docs.php3
http://homepages.tesco.net/~rainstorm/
To be honest I don't hold out much hope.
The second one was the one with RGB and composite inputs. And this is the one you need really.
Failing that, the Philips monitor that was popular with Amiga users (the model escapes me ATM) is a good alternative and quite cheap at the minute.