Re: Atari SC1435 Monitor on the Apple IIgs?

[nyder <nyder.23@gmail.com>]

On Thursday, March 28, 2013 6:41:08 PM UTC-7, Tempest wrote:
> On Thursday, March 28, 2013 5:31:53 PM UTC-4, nyder wrote:
> 
> 
> 
> > And I don't make my cables pretty, just functional.
> 
> 
> 
> Functional is all I'm looking for. :)

Okay, looking at pinouts and I see a potential problem.  

The Apple IIgs is analog output.

It doesn't have a horizontal sync listed. https://support.apple.com/kb/TA36688?viewlocale=en_US

According to this: http://www.gamesx.com/avpinouts/sc1435.htm
The monitor wants both Horizontal & Vertical sync.

And since I have commodore monitors, they take a composite sync in analog mode (want both for Digital Mode).

I would think that the SC was a digital monitor, but it doesn't have the Intensity pin.

According to this: http://nfggames.com/forum2/index.php?topic=583.0
I will need to separate the sync with a LM1881 chip.

So, to make this cable, I appear to have to do something I haven't done before and have no way to test it.   Adding a chip to the cable isn't a big deal, but not being able to test it is.  

Wonder if someone in my local old computer club has an Atari monitor...