XEGS Monitor Port

[flashjazzcat]

I finally got around to putting a monitor jack where the modulator used to be on my XEGS last night. It had looked like this for months:

 

 

And the work, done with the dremel:

 

 

 

 

 

All but the ground and retaining pin holes were cleared of copper and the jack was epoxied in place before the ground and securing pins were soldered to ground. I had to grind the TV icon off the back of the case.

Edited April 23, 2010 by flashjazzcat

[Rybags]

Got specifics of where the connection points are to grab Chroma, Luma and Audio on that machine?

 

I'd be tempted to do something similar to one of mine... although I'd probably just put RCA jacks for Chroma and Luma since it's a 1:1 fit for the 1084s monitor.

[flashjazzcat]

This should tell you everything you need to know:

 

Super_Video_S_video_for_the_XEGM.pdf

 

I haven't done the rest of the mod yet, although taking the cursed TV modulator out improved the picture and got rid of artifacting. The picture's still a bit grotty so I'll attend to it later. The XEGS is upgraded to 128MB but I'm wondering if Lotharek's 1MB board which is currently in my VBXE machine (and will be coming out sharpish when candle's new board is available) might be shoehorned into the XEGS.

[tregare]

This should tell you everything you need to know:

 

Super_Video_S_video_for_the_XEGM.pdf

 

I haven't done the rest of the mod yet, although taking the cursed TV modulator out improved the picture and got rid of artifacting. The picture's still a bit grotty so I'll attend to it later. The XEGS is upgraded to 128MB but I'm wondering if Lotharek's 1MB board which is currently in my VBXE machine (and will be coming out sharpish when candle's new board is available) might be shoehorned into the XEGS.

 

 

if I may inquire, why the tantalum cap? wouldn't a non-polarized multilayer ceramic work as well?

[flashjazzcat]

if I may inquire, why the tantalum cap? wouldn't a non-polarized multilayer ceramic work as well?

No idea. I didn't design the mod. Anyone else explain this?

[+bob1200xl]

Normally, a 10ufd capacitor is only available as an electrolytic - either tantalum or aluminum. A 10ufd is a 10ufd, but the inductive/resistive characteristics vary widely, giving you nasty surprises at high frequencies. So, a different family of capacitors may or may not perform well. Maybe that's just what he had in his parts drawers. Maybe not...

 

Bob

 

 

 

This should tell you everything you need to know:

 

Super_Video_S_video_for_the_XEGM.pdf

 

I haven't done the rest of the mod yet, although taking the cursed TV modulator out improved the picture and got rid of artifacting. The picture's still a bit grotty so I'll attend to it later. The XEGS is upgraded to 128MB but I'm wondering if Lotharek's 1MB board which is currently in my VBXE machine (and will be coming out sharpish when candle's new board is available) might be shoehorned into the XEGS.

 

 

if I may inquire, why the tantalum cap? wouldn't a non-polarized multilayer ceramic work as well?

[puppetmark]

if I may inquire, why the tantalum cap? wouldn't a non-polarized multilayer ceramic work as well?

 

I was concerned about the frequencies yes, but mostly, It fits very nicely between R78 and R79 as in the photo.

[candle]

novadays, we could use multilayer ceramic caps, or go for miniature MKT/MKSE types

[Kjmann]

This should tell you everything you need to know:

 

Super_Video_S_video_for_the_XEGM.pdf

 

I haven't done the rest of the mod yet, although taking the cursed TV modulator out improved the picture and got rid of artifacting. The picture's still a bit grotty so I'll attend to it later. The XEGS is upgraded to 128MB but I'm wondering if Lotharek's 1MB board which is currently in my VBXE machine (and will be coming out sharpish when candle's new board is available) might be shoehorned into the XEGS.

 

 

if I may inquire, why the tantalum cap? wouldn't a non-polarized multilayer ceramic work as well?

 

When Building my S-Video Upgrade Board, I found that Using a Ceramic Cap Caused Problems when used on monitors such as the Commodore 108x, 170x,180x and 190x Series. The Chroma would get washed out and almost had a green tint to the picture.

[flashjazzcat]

I did the luma half of the XEGS Super Video mod today (didn't bother with the chroma half because I've done away with the composite output), and I also replaced the TC4050 chip with a socketed HC4050. Results are good:

 

 

 

Forgot to take some "before" pics, but the original video output surely stunk up the room. Only lingering fault is the usual XE vertical banding, although it's relatively slight (and is definitely on the luma, not the chroma). Output is pictured through the M227WD display, which remains unmatched by other LCDs. Can't wait to see how it looks through the 1084S!

[flashjazzcat]

The Kenmark 15" set is much more forgiving with the vertical banding:

 

 

[puppetmark]

Nice work! I hope others try this too. I think It is worth the effort if you have the skills to do the mod. I can put some parts kits together if there is ever interest.