Acidmods
Console Modding------ ( Here you can talk about your favorite Consoles ) => Retro console modding => Legacy Consoles => Completed projects => Topic started by: WERY on November 30, 2010, 07:31:58 PM
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I have modified my 7800 system so that I can connect it to an AV output. It works :D :D I did this mod in the spring so it was about time I put it in here
Here I build a new circuitboard for the sound and picture circuits so that they can be connected to the AV jacks that goes to the TV.
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FPtZFyTdue.jpg&hash=47b1dfeb4ef9a6749846755ad0114f2d8ad5068e)
The blue cable is soldered to the GND on the mobo. The red one is connected to the GND on the RCA jacks. I also put on some rubberfeet on the other side of the curcuitbaord so I can place in on the mobo without it getting in contact with other circuit's on the mobo.
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FRaevWIeGI.jpg&hash=d2ca32ceb95e5e7ce63a95d7148b2ebfc438810e)
Here, I connect the sound from the console to the new curcuitboard.The black cable goes to the upper side of the C14 so that I can take out the POKEY sound and connect it to the RCA. The red one is the sound itself from the C10
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FIoSRYWFwl.jpg&hash=33b4f603ee5f31d3b7851a89be63b7c40113f377)
I had to remove this while soldering the POKEY cable but luckily it only takes 2 screws to remove/put it back.
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FXfgzGtAyc.jpg&hash=42a085ef66867f2d8523efb3260ec6901deac515)
Here is the whole system with the new AVboard connected to the mobo. However I changed 2 of the cables in this picture, the one that gives 5 V and the video-input.
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FSLkUzSnCS.jpg&hash=e853e722e6c497475ca7767ac8cd510df83c6530)
It may be stupid by Atari to not using AV connection from the beginning but they on the other hand put an AV-modifier hole on the side so the cables can go out that way after put back the RF shield together
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FUwNtbtyeX.jpg&hash=8963a3d6850597674316cefdba0b5ffd6dc03ed4)
The cables gets soldered to the RCA jacks
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FRwoWjsVKM.jpg&hash=d3c1f25c497e020de75b475d214dedab85357d51)
So it is...
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2Fyusrgmpma.jpg&hash=80d81f454493867ca754212075f2073f8c4467da)
Galaga was the first game to be tested
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FabGWILvgb.jpg&hash=2034a1db48b4569dbbdc7c60739718f3a0b140be)
Picture is a little blured but it looks much better in reality.
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FMInQBMRwx.jpg&hash=2693b43859e08ae4f92d65f02951ce865b7945a7)
The room lacked enough light
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FpYxucTJDi.jpg&hash=5debc7a8250f04ee4b6ec4703fc1adb4a0331069)
I found a new favourite game and that is Robotron 2084
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FojxVEnohs.jpg&hash=f1d7c1c2bea5e5910525356320e6c8f0179ec759)
This is the scheme for the videomod(sound not included on it) but the 75 ohms resistor was changed to a 82 ohms since I did not had any 75. It works great any way
(https://acidmods.com/forum/proxy.php?request=http%3A%2F%2Fpici.se%2Fpictures%2FYIrWnhTuH.jpg&hash=0b63d56455d91c8a77f887faabed46cd9186a0ee)
I might draw new schematics of this mod where the Audio will be included
Hope to deal with a 5200 in future
edit; and so I did. A guide on that comes later on
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Sorry, I know this has been posted nearly 2 years ago, i've not been on this forum for ages!
Is this for a PAL system or NTSC? (quite relevant).
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Good luck, the OP has not been active here since 1/11/2011
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ok, no problem. I've not been active here for far longer! lol
Found a couple of alternative methods for this mod elsewhere and thought found another one, however looks like this is the same one as puppetmark did on AtariAge; so no issue.