Re: Alternatives to an applecolor RGB?

[Drew <goggledrew@gmail.com>]

On Oct 7, 3:58 pm, Charlie <charlieD...@verEYEzon.net> wrote:
> On 10/7/2011 5:04 AM, Daniel Kruszyna wrote:
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> > Charlie<charlieD...@vereyezon.net>  wrote:
> >>> The problem is that any device that proposes to generate VGA video from an
> >>> Apple II (of any stripe) must also faithfully (instantaneously) render the
> >>> results of rapid video mode switching--a very difficult feat for non-native
> >>> video generation.
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> >> I'm not sure I see the problem.  To switch video modes you need only "watch"
> >> for accesses to the appropriate soft-switches.  When a soft-switch is
> >> accessed the card switches to the appropriate circuitry, probably faster than
> >> the Apple II.  While "playing around" with the Carte Blanche VGA video I
> >> often have two monitors (one with the native Apple video and the other from
> >> the Carte Blanche) side by side and I see no perceptible difference when
> >> video modes are switched.  The hardest part (for the designer) is knowing
> >> what happens when certain soft-switch combinations are accessed.  The
> >> documentation is a little vague on some modes.
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> > The difficulty arises when soft switches and video ram are changed _while the
> > screen is being drawn_. In this case, the converter must be synchronized to the
> > native video scanner.
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> In the case of the Carte Blanche card the video RAM and soft-switches
> are being used in a very similar way to the native Apple.  Any problem
> that would arise from changes to the video RAM/soft-switches while the
> screen is being drawn should be the same for both.  The Carte Blanche
> and presumably the Second Sight card do not generate the VGA "on the
> fly" but buffer the video RAM and internally mimic the status of the
> soft-switches.  The speed of the card is much faster than the Apple so
> it can easily keep the buffer "up to date".
> As Alex has pointed out, the GS specific modes are not supported "out of
> the box".  Still with limitations (mostly with the number of colors) you
> can have a very sharp (some would say too sharp :-) Finder Desktop.  See
> the picture at this link:
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> http://noboot.com/charlie/cbnotesgs1.htm
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> Charlie

oh that is annoying lol, i sold my CB as didn't think it was possible
to use it as a VGA card for the GS :(