Monday, January 30, 2012

Atari 800 TV Adapter

My latest acquisition is an Atari 800 box that I won on ebay for about $100. It came with an Atari 1050 Disk Drive, joystick, trackball, number pad and about seven and a half million games on 5.25" floppies. I pulled it out of the box, plugged the RCA cable into the composite video jack (yellow of the familiar red-white-yellow threesome) of my TV and powered it up to see... nothing. Apparently when the Atari came out, RCA connectors had not yet been adopted for composite video so the signal run through the cable is a broadcast TV (VHF) signal such as you might receive from an antenna.
The quick fix that worked for me was this little "phono plug to 'F' jack" adapter that allows you to plug the broadcast TV signal into the jack that is expecting it: the cable/antenna jack in the back of the TV. I picked it up at RadioShack for something like $5 but you can probably find it on eBay for next to nothing.


After fitting the Atari cable into the adapter and then plugging the other side into the TV I was able to get the Atari up and running. This link goes into a little more detail if you're curious.
One nice thing about the 800 and a few of the later models is that they have a monitor output in addition to the TV cable. The monitor jack is a 5 pin DIN connector which is apparently quite easy to convert to s-video so this might be a project for the future.

printf("Hello world");

This being my inaugural blog post, I'll take a second to lay out what I'm hoping to accomplish with this blog. I've always enjoyed tinkering with electronics and have found the internet to be an invaluable resource when my desk is covered in scavenged parts that don't seem to want to assemble themselves into a cohesive structure. Since this situation is ubiquitous throughout DIY-land I thought I'd contribute what I can to the collective body of knowledge. So hopefully when you, my reader, encounter this blog in a moment of crisis, I'll be able to save you some grief the way countless anonymous tinkerers have helped me with their blogs.

That said, my interest over the past couple of years has settled on computers. My formal education is in physics and (more specifically) astrophysics so most of what I post will be stuff I've picked up on the fly either on my own, working in labs or talking with people who actually know what they're doing. The bulk of these posts (I'm predicting, although my attention tends to wander) will be on vintage computers. I've acquired over the past few months an Apple ][e, an IBM 5150 and most recently an Atari 800, in various states of functionality. These machines are fascinating because despite being computers in every sense of the word, they are still simple enough for someone with no formal training to deconstruct and understand. If you're still reading this, you're clearly keen on getting your hands dirty so rather than waxing philosophical I'll shut up and start preparing material for this blog.

Happy soldering!