Re: PC-transporter...

[dempson@actrix.gen.nz (David Empson)]

Nathan Mates <nathan@visi.com> wrote:

> In article <5boce3$172c@uni.library.ucla.edu>,
>  <pubpc1@library.ucla.edu> wrote:
> >When I swapped the PCT's oscillator with one with double the MHz,
> >the display changed so that there were four little PCT screens, one
> >on each corner of the monitor.  Does this mean that the scan rate
> >is controlled by the oscillator and that I can theoretically use the
> >PCT with a VGA monitor?  I know that it won't give extra colors or
> >resolution, but will it work?  (The PCT is in a IIGS)
> 
>    Well, there's only a few pins different between the CGA and VGA
> connectors, and if I recall correctly, VGA monitors were digital RGB

Wrong.  EGA was digital.  VGA has always been analog.  CGA and VGA
connectors are considerably different.

In any case, the PC Transporter with a ColorSwitch card (part of the
IIgs installation kit) allows you to display CGA on the IIgs RGB monitor
(it uses resistor networks to convert the digital video to analog video,
and to switch the video signal between the PC and IIgs as required).
The card also has a connector which can be attached to a digital RGB CGA
monitor.

-- 
David Empson
dempson@actrix.gen.nz
Snail Mail: P.O. Box 27-103, Wellington, New Zealand