Re: monitor on IIgs

["Bill Garber" <willy46pa@comcast.net>]

> >GarberStreet is presently working on a sync doubling device,
> >and we hope to be able to offer it at a very reasonable price.
>
> This sounds like an excellent project.  I would suggest looking
> at the Amiga scan doublers.  The Amiga used monitors which
> synced on the same frequency, 15kHz, as the IIGS.  In fact,
> those Amiga monitors could be used on the IIGS with a cable
> that Alltech Electronics and others used to sell.

I think it's a worthwhile venture, since it can be built with minimal
parts, and with not too much effort.

> Scan doublers are common on the Amiga.

I have looked at the Amiga doubler, and other similar items.
The Amiga version is so far 90% of my schematic, but there
are a few minor changes in hopes of decreasing costs.

> A IIGS version taking the Amiga's as a blueprint, should be
> feasable.  It is just too bad Apple IIGS interests died out
> before this happened and because Commodore and Apple
> were once competitors, Amiga folks had no interest in the
> IIGS.

That's too bad, I think the IIgs is a fine piece of equipment
and doesn't even get close to the recognition it deserves.

> I used to know someone at our local Apple II user group,
> when it was still active, who was a television technician.
> He could change the scan frequency of a Mac/VGA monitor
> so that a IIGS can be connected directly.  Of course 99.9%
> of IIGS users will not have this knowledge and indeed
> should not attempt to open the monitor.  CRTs contain
> lethal electricity which is stored even when the monitor
> is unplugged.

The monitor conversion is certainly a minor issue, for one
who knows how to respect that high voltage and only shake
hands with ONE hand. Plus the discharging needs to be done
twice and only after the plug has been removed for at least
30 minutes. I'm going in a low res VGA monitor to see if it
has the doubling capacitor that many early VGA monitors
had. If you clip, remove or otherwise bypass the jumper
that adds the double capacitating circuit, they run at 15.75 kHz.
I'll bet not too many people remember that. Wish me luck, and
skill.
Thank you for your input, very positive, and not much of that
comes by anymore either.

Bill @ GarberStreet Enterprises
http://garberstreet.netfirms.com



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