Re: Atari SC1435 Monitor on the Apple IIgs?

[Michael J. Mahon <mjmahon@aol.com>]

nyder <nyder.23@gmail.com> wrote:
> On Monday, April 1, 2013 7:49:37 AM UTC-7, STYNX wrote:
>> 1: GND
>> 
>> 2: GND
>> 
>> 3: RED
>> 
>> 4: GREEN
>> 
>> 5: BLUE
>> 
>> 6: INTENSITY
>> 
>> 7: C-SYNC
>> 
>> 8: H-SYNC.
>> 
>> 9: V-SYNC.
>> 
>> From the SC1435 Handbook ;-)
>> 
>> It has CSYNC and it works with just a wire-cable on a IIgs!
> 
> you have the handbook?   really hard to find, any chance you can scan it for me?
> 
> The only 2 pieces of info I have is what you posted and that gamesx.com
> post (which some people might not like, but that site hasn't served me wrong before).
> 
> I'd just like some proof of it, because I'm not sure the LM1881 actually
> splits the signals, I think it might add a seperate V-sync.  The data
> sheet shows an C-sync out and a V-sync out.  If my monitor finds the
> C-sync on the H-sync line, then it will use that and not even use the
> V-sync, so i won't have a way to test that.
> 
> Guess at worst I can make 2 adaptors.  One with a the LM1881 and 1 using your pinouts.
> 
> I just want to get a cable made without breaking his monitor, ya know?  =)
> 
> Thanks for the info

Don't worry about the monitor--monitors protect themselves against sync
abnormalities. 

And composite sync is directly usable as horizontal sync. 

Vertical sync is just a squared-up version of low-passed composite sync.
Many monitors will process the vertical sync input to make composite sync
directly usable. 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon