Date   : Mon, 18 Jul 1994 09:31:02 +0100 (BST)
From   : amh15@... (Alan Hart)
Subject: Re: Teletext graphics question...

> Anyone know for sure what the hold and release graphics teletext controls
> do ?

Oh wow! I remember this, I think!

As I remember, 'hold' causes all colour-change characters to appear as the
previous graphics character [i.e. the one to the left] whilst still changing
the colour. The purpose of this is to give continuous blocks of graphics
which change colour, e.g. a narrow line changing colour along its
[horizontal] length with no breaks. There was a game that used this on the 
scores page!

Release reverts to normal mode.

I may be slightly wrong in detail, but this is the gist of what it does.

> Also, there's a "conceal" display, which I assumes makes all characters
> from that position onwards appear blank, but how is it turned off ?

I think you press the 'reveal' button on your remote control [oh dear, I 
don't seem to have one] :)


Alan

 Alan Hart  -  amh15@...  -  University of Cambridge, UK