Anyone ever done an S-Video hack?

[Dr_Righteous]

@JMKurtz

See? I told you there'd be interest.

@adric22

Yes, I have tried Neobitz with both an A500 and A4000. It works great! You must connect it directly to the video connector, do not use the VGA adapter as it messes with the sync.

See this thread

adric22 wrote:
I have posted this on a few other forums.  So far nobody has responded, so I'm guessing it has never been done.

I think an Amiga 1000 should be able to run S-Video.  There is plenty of room on the back of the case for it, and I believe all the signals should be available.  I have been poking around and managed to find a good source for the luma signal, but not the chroma.   I have the schematic for the A1000 but it is a scanned copy of a hand-drawn schematic and it is a bit tough to follow.

I think this project can be done if there are some better experts out there.  It would make the Amiga 1000 far more useable on modern display devices.  I wouldn't even mind if I had to remove some component which would render the composite output inoperative (after all, it is easy to convert S-video to composite with an external cable)

I'd love to do the same thing to the A500, but studying the schematic I don't believe it is possible without additional circuitry.

What you need is the AD725 from Analog devices.

A schematic can be found here: http://www.freewebs.com/segasonicfan/arcadeworks.htm

However, as reddwarfer pointed out, the RGB lines are in the DB-23 video connector and this should therefore work with all Amigas 500/500+/600/1000/1200/1500/2000/2500/3000/4000

The neobitz-s which can also be purchased here ( http://southtown-homebrew.com/index.php?cPath=185 )will also do the job.

The neobitz-s uses the AD724 chip which is very similar.

[adric22]

Dr_Righteous, I've never heard of this VGA adapter.. and I have no such thing.  I was planning to plug it into the 23 pin video output for testing.. But my eventual goal is to mount the board inside the A1000 and add an S-Video jack to the back of it.  I still need to open up my A500 and see if there is room for such a thing.  

[Dr_Righteous]

@adric22

It's used to attach multisync monitors like the C=1950 to the Amiga's 23 pin video out. Not everyone needs/uses it. I warn against it simply because it's tempting to try and use a 15 pin VGA connector, as those are still made. You're far better off cutting two pins off a 25 pin connector to make it fit the 23 pin video out.

One of these days I'd like to etch out an internal video slot PCB and attach the Neobitz parts to it. That'd be so much cleaner.

[adric22]

>> One of these days I'd like to etch out an internal
>> video slot PCB and attach the Neobitz parts to it.
>> That'd be so much cleaner.

That is essentially what I plan to do, mount it all internal.  I just hope it doesn't consume too much power.  I doubt it will.

[omnicron10]

You can get db23 connectors from here.

http://www.topmicrousa.com/2200-023p.html

These guys are pretty close to me.  Only 25 mins in car.

Tim

[Dr_Righteous]

Trouble is, that's a male connector. This requires a female connector.