Scott Alfter writes ... > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > In article , > Tony Cianfaglione 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. > .... Thanks for converting the files. Think you're right about displaying only half of each horizontal line. For one thing, there is no provision for increasing the dot rate. If you cut the time for each horizontal line in half, either the dot rate has to be doubled or you settle for displaying half as many dots. A rough translation of the info supplied together with the schematic indicates that you are supposed to use a switch to select the left or right half of the original display for viewing. The other half (which would appear on alternate horizontal lines) is blanked using transistors to turn Off (shunt) RGB video during the time the line would be displayed. Rubywand