[Gllug] XOR

[Richard Jones]

On Thu, Apr 15, 2004 at 05:33:17PM +0100, Andrew Halliwell wrote:
> Even the sinclair zx spectrum has "OVER 1" mode, which turned on XOR for
> screen writing. (Used in that case for games written in BASIC, and of
> course, for things like underline, creating umlauts from 2 normal
> characters, u and " iirc, etc)

There's even a bogus patent on using XOR for cursor drawing IIRC.  See
John Walker's page about bogus patents:

http://www.fourmilab.ch/autofile/www/chapter2_105.html

Rich.

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