Heres how you can make your own top quality S-Video video board for almost any Atari 8 bit. It uses few parts and would take minutes to install.
The Atari series shares the same common IC graphics chip (GTIA) and has Luma and chroma produced at a high level. Unfortunately Atari made an ass of this on the XL series (particularly the 600XL) and didnt improve much with the XE series.
I produced a module that did this a few years back but thought i would make the details on how you can make your own here. Ive photographed my own for clarity, but ive some ataris with just the components hard wired on to the boards with wires,
The circuit has been tested on:
it will definitely work on 1200XL's and 800's, however the 800 has good native s-video, so it would be best to leave alone or use Jurgens 800 color board as the components needed to remove are more fiddly.
33 Ohm resistor (any wattage - a 0.25w one is suggested)
50 ohm trimmer
16V 22uF capacitor (10uf value will work also)
The circuit looks like this (both on cad and in simple layout)
The layout should be similar to this:
The circuit can easily be hard wired together or put on prototype board etc.
The instruction on installation to your Atari can be found here (ignore the fact its a module and substitute for the board/circuit) Magic Knights XL-XE module instruction.pdf 2.07MB 79 downloads
Anyone wanting to make their own PCB - heres the gerber files etc : XL s-video 1.00f_2018-12-04.zip 32.88KB 24 downloads
Comments and questions welcome!
Edited by Magic Knight, Fri Jan 11, 2019 9:08 AM.