Re: Double hires mode color artifacts

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

Michael J. Mahon <mjmahon@aol.com> wrote:
> Dirk Thierbach wrote:
>> Michael J. Mahon <mjmahon@aol.com> wrote:

>>>There have been several threads in this newsgroup on how composite
>>>monitors render Apple II video.  Try searching Google Groups and
>>>see if any of that helps...

So far, that turned up more questions than answers.

http://groups.google.com/group/comp.sys.apple2/browse_thread/thread/1ea1859698adaf72/938d57197f4a22ff?lnk=st&q=&rnum=9#938d57197f4a22ff

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.

Another posting I found says

: 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?

And finally, another says

: but in Beagle Graphics, the Beagle Brothers Double-Hires utility,
: there are dual modes you can set for 560x192 mode, and it says one of
: them will appear in black and white on RGB monitors.

What's the deal here?

> Here's a line-wrapping start!
> 
> >http://groups.google.com/group/comp.sys.apple2/browse_thread/thread/b882f2ef8a51b2b9/508b5608c5c3d51b?lnk=st&q=comp.sys.apple2%3A+chroma+video+RGB+linards&rnum=3#
> 

I'll have a look when I go online again, though I guess Linards has answered
the main question I had. 

Thanks for the help so far.

- Dirk