Re: GS RGB to VGA Adapter

[salfter@salfter.ncc74656.dyndns.org (Scott Alfter)]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

In article <Pine.GSO.3.95.iB1.0.1010516001450.29809B-100000@halifax.chebucto.ns.ca>,
Tony Cianfaglione  <ab616@chebucto.ns.ca> wrote:
>   Here is an adapter I've been working on to get vga output without a
>Second Sight card.  Any techies out there want to look this over and see
>if it works for you.  Build and use it at your own risk as I haven't
>tested it yet.

This circuit does nothing for the refresh rate, which is outside the range
of most modern VGA monitors (some older models, like the NEC MultiSync 3D I
use, can handle the GS's 15.75 kHz horizontal sync rate.)  What could be
more useful would be this sync doubler:

http://www.aminet.net/~aminet/dirs/aminet/hard/hack/Syncdoubler.lha

A conversion of this archive to something readable by a wider variety of
computers is on my website:

http://salfter.dyndns.org/files/Syncdoubler.zip

I haven't tried building this gadget yet, but it looks like it would double
the horizontal scan rate.  It also looks at first glance, though, like it
would only display half of each scan line...unless I'm reading something
incorrectly.  It uses a 74LS123, three 2N2222s, and a few passive components
and could be lashed together quickly enough to see if it'll get the job
done.

  _/_
 / v \
(IIGS(  Scott Alfter (remove Voyager's hull number for email address)
 \_^_/  http://salfter.dyndns.org
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.4 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE7Ai6ZVgTKos01OwkRAsePAKC4a/zHgLWIH6kQiaU/SEpLj1bcRACdG0JW
VbZrq2Q6efqqUAQbRk8UlcU=
=7vjn
-----END PGP SIGNATURE-----