Re: Double hires mode color artifacts

[Dirk Thierbach <dthierbach@usenet.arcornews.de>]

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