good to hear that your Atom is still working.
There's a wire protruding from the back of the computer. Seems to be poking out through the video exit. No idea what this is for and there's no connector. Does anyone know what this might be?
If the cable is connected to pins 9 and 10 of PL4, then it's a monochrome composite video output.
Much better quality than the RF output.
When I run a program I see a lot of distortion or snow on the screen. I've looked at some youtube videos of various Atoms and I see similar distortion on some of this videos so I guess it's not just mine. Why does this happen and is there anyway to get rid of this?
This is normal, the CPU and videprocessor share the same bus for video memory and when the CPU is writing data to the video memory, it is shown as noise on the screen. You can get rid of this by building a noisekiller circuit or use a colourboard with noisekiller.
To make the Atom usable, I'm going to need some sort of SD card interface and some more RAM. What are my options? I've seen the list of Atom hardware here: http://www.stardot.org.uk/forums/viewto ... cts#p86259
. Are any of these boards still available for purchase? Are they easy to fit? Is soldering required?
For an SD-card interface, the AtoMMC is a very good solution and is still available. You can contact sir morris(Charlie) for one.
Phills RAMROM board is a good option to fill your memory with 32 kB RAM, 8 utilty roms and some other nice features. Please contact prime (Phill) for this board. Both boards fit in the existing sockets and don't need soldering however it's better to replace the existing bad sockets on the mainboard with turnpin sockets.
I seem to have an 8V power supply. Will this prevent me from installing any of the upgrades?
The 8V is transformed to 5V in your Atom and the Atom, including upgrades, are working at 5V.
Most people have made links LK6/7 in the Atom and are using a 5V power supply because these are easier to get.