Date   : Mon, 09 Aug 2004 21:22:40 +0000
From   : Jules Richardson <julesrichardsonuk@...>
Subject: Re: Oddity with display

On Mon, 2004-08-09 at 20:35, Chris Priest wrote:
> Hi All,

Hi & welcome :)
>  
> Been cleaning up and fixing up one of the beebs, hooked it up to a Cub
> (which I know to be working perfectly)
>  
> When the beeb powers up, I get the usual BBC Computer 32K, Acorn DFS,
> except... it's black lettering on a white background!
>  
> Most strange, could it be someone has patched the MOS to do this? or
> the basic rom?

Check jumper S26; in one position (or no jumper at all) it causes the
hardware to produce normal video, and in the other it produces inverse
video. I've never actually seen anyone make use of this feature on a
beeb before...

cheers

Jules