Date   : Wed, 20 Jul 1994 00:00:58 +0100
From   : jfid@... (James Fidell)
Subject: Re: Teletext graphics question...

I thought that others would like to see this, so asked Richard if I could
repost it to the mailing list...

Richard Russell (KW 36684) wrote:

> James,
>
> > Anyone know for sure what the hold and release graphics teletext
> > controls do ?
> >
> > Also, there's a "conceal" display, which I assumes makes all
> > characters from that position onwards appear blank, but how is it
> > turned off ?
>
> Yes, I certainly know what they do! Sorry to be facetious, but you
> really *must* have the proper teletext/videotex specification if
> you are to implement any emulation - what you need is the Broadcast
> Teletext Specification or one of the later versions such as the World
> System Teletext Specification. In the context of a Beeb emulator
> you also need to be aware of the ways in which MODE 7 differs from
> a conventional teletext/videotex display (double height being the
> obvious example, of course).
>
> I have already offered my MODE7.COM emulator for the PC, which you
> should find provides a 100% emulation of the Beeb's MODE 7 display.
>
> Richard @ BBC.

-- 
 "Yield to temptation --             |
  it may not pass your way again"    |     jfid@...        
                                     |
        - Lazarus Long               |              James Fidell