Re: Mac to VGA Adapter Question

[Phil Beesley <pb14@le.ac.uk>]

In article <3d89a8c7.8731696@news.videotron.ca>, Mitchell Spector
<a_specto@alcor.concordia.ca> wrote:

> dempson@actrix.gen.nz (David Empson) wrote:
> 
> >Bryan Parkoff <BParkoff@satx.rr.com> wrote:
> >> Do you think that Apple IIgs will be compatible to Mac to VGA Adapter so
> >> it will allow me to view SVGA monitor to Apple IIgs video port through Mac
> >> to VGA Adapter.
> >
> >It won't work by itself.  You would also need a devise which doubles the
> >scan frequency, so that the monitor is able to lock onto the video
> >signal.
> 
>     There is a _rare_ exception where these Mac-to-VGA adapters can 
> be used on the IIgs. That is if the monitor supports lower horizontal scan
> frequencies in addition to standard VGA frequencies. A handful of older
> VGA monitors could drop down to 15.75 kHz (NTSC scan rate) but they
> were unusual a decade ago and don't at all exist today--at least to the
> best of my knowledge.

A few monitors of this type are still manufactured, mainly for
industrial control systems or medical applications. Have a look at the
Desk-Scan 1502, for example, at http://www.microvitec.co.uk/

Phil