toddtmw Posted May 17, 2017 Share Posted May 17, 2017 It looks like some (alll?) 800XL's do not support S-Video. It sounds like some of the later ones do? Does anyone know how I can tell without an S-Video cable and without opening my 800XL? (Serial range, some sort of BASIC program graphics test, etc) Is there a better (read cheaper) place to get a monitor cable than the B&C Computer Visions eBay auction? Sorry, a lot of questions. Thanks! -Todd Quote Link to comment Share on other sites More sharing options...
Airshack Posted May 17, 2017 Share Posted May 17, 2017 Good question! I'm wondering the same thing. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted May 17, 2017 Share Posted May 17, 2017 (edited) On eBay type " Atari XL/XE A/V cable " The ones from Hercules workshop are the ones I get. ( Canada ) Edited May 17, 2017 by Paul Westphal Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted May 17, 2017 Share Posted May 17, 2017 It looks like some (alll?) 800XL's do not support S-Video. It sounds like some of the later ones do? Does anyone know how I can tell without an S-Video cable and without opening my 800XL? (Serial range, some sort of BASIC program graphics test, etc) Is there a better (read cheaper) place to get a monitor cable than the B&C Computer Visions eBay auction? Sorry, a lot of questions. Thanks! -Todd I don't think you CAN tell for sure. I don't believe any NTSC 800XL's do, though I think PAL units do. I have a Rev C 800XL from late 1984 and it did NOT have S-video until I modded it. If all you want is to add Chroma to the stock video circuit, all you need to do is solder one wire. Very, very simple mod. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 17, 2017 Share Posted May 17, 2017 (edited) yep I do the mod with resistor but you can take it all the way to decoupling composite with a switch Edited May 17, 2017 by _The Doctor__ Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted May 17, 2017 Share Posted May 17, 2017 yep I do the mod with resistor but you can take it all the way to decoupling composite with a switch Or decoupling it by pulling the 4050 and installing one of Bryan's UAB boards. 2 Quote Link to comment Share on other sites More sharing options...
BillC Posted May 17, 2017 Share Posted May 17, 2017 I'm not certain, but believe that later 800XLs that came with Rev.C BASIC also had the color output connected to the DIN video port. The version of BASIC can be discovered by a "PRINT PEEK(43234)" 162= Revision A 96= Revision B 234= Revision C Quote Link to comment Share on other sites More sharing options...
Airshack Posted May 17, 2017 Share Posted May 17, 2017 Solder one wire? Some do with a resistor? Please send any links you may have. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 17, 2017 Share Posted May 17, 2017 (edited) http://atariage.com/forums/topic/198754-current-best-s-video-picture-improvement-mod-for-800xl/?p=3450666 http://atariage.com/forums/topic/198754-current-best-s-video-picture-improvement-mod-for-800xl/?p=2534448 the links don't include every thing but if you read to the bottom you'll get most of it and know what to search... it is a dead simple mod one wire... one resistor if you choose and lift a capacitor out... many video mods exist... some add direct power with taroid beads etc... Edited May 17, 2017 by _The Doctor__ Quote Link to comment Share on other sites More sharing options...
redman Posted May 17, 2017 Share Posted May 17, 2017 Hello, I just tested an 800XL with chroma output and one without chroma using a digital voltmeter. I measured the voltage between pin 5 of the video output connector and ground. I used a small wire to connect to pin 5 with the positive probe and I touched the negative probe to the outside of the tv output connector. The one without chroma measured .01 volts - probably should be 0 because nothing is connected to it. The one with the chroma mod measured 2.37 volts. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted May 18, 2017 Share Posted May 18, 2017 Hello, I just tested an 800XL with chroma output and one without chroma using a digital voltmeter. I measured the voltage between pin 5 of the video output connector and ground. I used a small wire to connect to pin 5 with the positive probe and I touched the negative probe to the outside of the tv output connector. The one without chroma measured .01 volts - probably should be 0 because nothing is connected to it. The one with the chroma mod measured 2.37 volts. That's probably (a) within the accuracy and/or precision ratings of your meter, and (b) insignificant, caused by natural resistance through the components involved and "true" ground (e.g., the rod that should be driven 8' or so deep into the soil near your household electrical service. Quote Link to comment Share on other sites More sharing options...
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