Date   : Tue, 16 Jun 2009 14:31:40 +0100
From   : bbcmailinglist@... (Ian Wolstenholme)
Subject: Black Teletext

At the weekend I wrote a little routine which traps the OSWRCH thingy
and changes any VDU code &80 into an &84.  Much to my surprise, it worked!
So if I typed VDU &80,65 I would get a blue letter A etc.

Except it doesn't work for the Teletext adapter, which must load the pages
direct into screen RAM!

Is there a way to trap any write to the Mode 7 screen RAM and do a similar
fiddle?

Best wishes,


Ian