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Post by RetroHacker on Dec 6, 2004 13:11:42 GMT -5
Well, I did some poking around in my DTV and found the connections for S-Video! Looking at the inside of the joystick with the back off, fire buttons toward the top, the video section is on the lower left The Chroma signal can be pulled off the TOP of R16 (side closest to the ASIC blob)
The Luma signal can be pulled off R14 - it doesn't matter which side, it's a zero ohm resistor. You can also get it from the righthand side of C13, or the bottom of R16.
Ground can be tapped off at an convenient ground point. For simplicities sake, you can take it from the center connection for the A/V lead, it's easier to solder to, or for something closer, you can use the left side of R10 or the right side of R20.
The Chroma signal is a little strong to use directly though, I'd suggest using a 470 ohm resistor with it to balance the color intensity like in the DTV.
Simply solder some wires onto the connection points, and you can use your DTV with an S-Video compatible television, or with that trusty Commodore 1702 monitor with the seperate Chroma and Luma jacks on the back.
Note that when you have the S-Video cable connected to the television/monitor, you lose the composite video output.
Hint: A Macintosh ADB keyboard cable has the same connector used on S-Video...
-Ian
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Post by RaymondDay on Dec 6, 2004 17:23:22 GMT -5
Super that you found out how to do S-Video. I looked for a image of the board to see if could put arrows on it were you said to put the wires to make it easy. I went to www.jbrain.com/vicug/gallery/c64dtv?page=10I guess Jim was at the "The World of Commodore" Expo Toronto, Ontario, Canada last week end. I called Jeri on the phone last week she wanted me to be there but I had to work. I would of love to be there. Because she showing the C64-DTV. But wow looks like Jim put photos of it up on his gallery page go to page 10 the link I gave. It goes to page 11 and Wow shows the DTV schematics! This should help you a lot Ian! Jeri must of layed down the paper of the schematics at the Expo.
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Post by RaymondDay on Dec 8, 2004 7:10:32 GMT -5
Thank you Ian!
I just put S-Video on my C64-DTV! It works super! Looks super!
You are right that "you lose the composite video output" I got a 12 foot S-Video cord with RCA plugs for stereo. I used the wight for sound and the red for composite video. I removed the Audio/Video cord that came with it.
I used the composite and pluged in the S-Video and the composite goes out. It don't matter only going to use one or the other any way.
But wow the video looks so good. The blue is a lot lighter using S-Video so I can see the text way better don't even have to press Ctrl 2 to make the text wight color to see it better. With S-Video looks just like the commodore 64.
I closed it up. I have the keyboard and 5 pin DIN for the serial port mounted on the back. It's a mess of wires in side now. But from the out side it looks very nice.
O I talked to Jeri asked about the schematic that is on Jim Brain web page. She said it's a old schematic of the DTV but it's close to how the DTV is now.
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Post by 87C751 on Jan 17, 2005 14:53:33 GMT -5
Talk about your tight fit! A DigiKey CP-2540-ND S-Video jack just fits between the fire buttons on the forward bulkhead, after a little Dremel work to flatten its ears. S-Video looks really good on my TV! Pictures at www.rant-central.com/nudge-nudge/s-videoThanks for the great info, guys!
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Post by David Murray on Oct 28, 2005 21:53:11 GMT -5
I have been trying to connect up the S-video signal. However, I do not believe this is true seperated video. The reason is I do not have an s-video monitor handy at the moment. But I just used the Luma signal. It doesn't matter which of the 3 mentioned places I get it from, the signal in my monitor still has color. The color is very low saturation and also the picture jumps every few seconds. Maybe it is just the monitor I'm using on the jumping. But there shouldn't be any color. Okay.. actually. I just tried my 1084 monitor. Something is wrong. Granted, the signal comming from R14 is totally colorless as long as I have the LCA switch turned on. But it still has color when it is in composite mode, (albiet very little) and hooking up R16 doesn't seem to add anything at all. In fact, it displays a really ugly picture if you hook it up to the luma input on the monitor by itself. But hooking up both the luma and chroma up properly to my 1084 in LCA mode just gives me a B&W picture. I even tried turning up the color knob all the way and also tried with and without the 470 ohm resistor. I know the monitor works fine in this mode with my real C64. So I don't want to hear any replies of broken monitors. So is it possible my DTV is different? I checked against this picture I found here on the forum, www.rant-central.com/nudge-nudge/s-video and I am connected to the same places. However, my DTV has all epoxy blobs and doesn't look exaclty like that. Also, I am getting my ground from the same place as the A/V which should be fine, right?
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