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Re: Double hires mode color artifacts



How do I test this on an RGB card? I have a Taxan/Kaga RGB card installed on my IIe, but no docs on its behavior. Could I just run Beagle Graphics and look at the results?

Dirk Thierbach wrote:
vladitx <vladitx@nucleusys.com> wrote:
On Sep 5, 9:41 am, Dirk Thierbach <dthierb...@usenet.arcornews.de>
wrote:

says that you can set b&w mode for double-hires by disabling 80COL
when enabling AN3. Is that correct? Other postings in this thread
heavily dispute it.

This should be feature of a slot7 RGB card, not of the //e on-board
video generator.

Is that feature actually used by any programs, so it's worth simulating
it? What about e.g. Beagle Graphics, is that the explanation for the
four "modes" which I don't understand at the moment?

What does the ordinary //e do in that situation? Normal hires, is that
correct?

: I think I read somewhere that RGB cards for the IIe look at the high
: bit of each byte when displaying double Hi-Res.  The high bit tells
: the video hardware to display as B&W or as color.  You can set this
: bit differently for each group of 7 pixels on the screen.

Is that true?

Depends on the RGB card, but definitely possible.

Same question as above: Has anyone seen such a card, and is it worth emulating it?

- Dirk