Re: What GSE-Reactive Really Needs to Make

["Michael J. Mahon" <mjmahon@aol.com>]

Bill Garber wrote:
> "Michael J. Mahon" <mjmahon@aol.com> wrote in message 
> ooGdncOW9aoAkWneRVn-qA@comcast.com">news:ooGdncOW9aoAkWneRVn-qA@comcast.com...
>
> > Henry wrote:
> >
> > > Hello Adam.
> > >
> > > Yes, I agree that a VGA card or something of the like would be a much 
> > > welcomed addition to the Apple II community.  The main issue with it is 
> > > that it's hard and there's only really one example for us to go on. 
> > > Simple enough explanation.  With a USB interface card we don't even have 
> > > an example to go on, so we'd be breaking new ground.
> >
> > Consider Ed Eastman's approach--it seems quite workable.
>
> I have many, many sample schematics for line and scan doublers,
> and although I could build one, this would be very expensive if
> using the original parts. I will see if Henry has someone in the
> FPGA area yet, and if so, then it may be possible to place the
> entire device into a single chip. Let me have a try at this.

Although much about chip prices depends on quantities, the RGB-
to-VGA chips are not expensive chips.  And unless the adapter is
"piggybacked" onto the IIgs video circuits, low cost with high
quality will remain an elusive goal.

The key is to lock to (or tap into) the IIgs dot clock--and
piggybacking allows the A/D's to be eliminated.

-michael

Music synthesis for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it is seriously underused."