Re: Interesting graphics hacks?

[dempson@actrix.gen.nz (David Empson)]

Pim Blokland <pDOTblokland@spcgroup.nl> wrote:

> Michael A. Balfour wrote:
> 
> > Has anybody ever hacked around with the graphics ROM in their Apple II?
> 
> What exactly do you mean by "the graphics ROM"?

The video ROM, which is used in the IIe and IIc.  It contains the
patterns used to generate all the text, lo-res and hi-res graphics,
though the hi-res patterns are a 1:1 mapping.

By comparison, the ][ and ][+ have a simple character generator ROM that
contains the text character images only.


To answer the original question: if you change the hi-res graphics
patterns, the most interesting effects you could achieve would be to
cause all graphics to be inverted (black vs white), or to mirror image
within each group of 7 pixels.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand