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Found 3 results

  1. I was starting to add information about RAM upgrades, for the 400/800 series of machines, to the website I'm building for Atari Hardware. To my dismay, I've found there is very little in the way of documentation for commercial upgrades available online in this area. The only one I've been able to find thus far is the 400 48K RAM expansion instructions. Looking at the Atari FAQ (and from my own recollections of conversations on these forums) I know there are many more that were available. I have documentation for the Axlon RAMPower 32, which I'll be scanning. Does anyone else have 400/800 commercial documentation that they can scan and contribute to the community? Also, pictures of the live modules would be nice for the record as well. I have found pictures on AA of some modules such as: Chrystal Computer Products 256K RAMCard, Mosaic 32K RAM Board, and a few others; but no documentation for these. Any help is greatly appreciated.
  2. I took some time and hooked up the Axlon Andy Circuit on a breadboard. I used the schematic, data sheets, and a lot of trial and error, but I got it working, so I thought I would share the results. It was really a thrill to hear and see him come alive! It's really an ingenious design. 3 CMOS gates, three transistors, and a 10 transistor motor driver. Very inexpensive parts. The circuit I build is exactly from the schematic except for a couple of resistor values I had to change to get the sensors working. I have no idea what values were used in the original Andy (I do not own one) so I had to adjust for what I had available. The sound sensor is still actually a bit too sensitive, but I am still working on that. Also, I replaced the motor driver section with a SN754410 motor driver chip which saved me ten transistors! It will also allow a smaller and more efficient Andy to be build. Here are some pics of the circuit: Here's the video of Andy in action: [media=320x240] [/media]
  3. So I got my father's Atari 800 out again recently, and tried to start figuring out just what upgrades he had done to it, and how they might be useful. He told me at one point, and this was something like 30 years ago, that he was trying to get the 800 so that it would work like an XL (I had the 800 XL). The OS board has had work done on it, and the #2 memory card has a switch. Using SysInfo, it shows a 1920K (!) Axlon RAM bank. Searching AtariAge last night, I couldn't find a way to get into that bank for testing it, but I was able to use a couple of ATR files off of my SIO2SD to get it to successfully create a RAM disk. But I still have no idea what the actual capacity is. Here are some photos. All cards in the Atari 800 with the top off. OS Board RAM from slot 1 RAM from slot 2, with physical switch
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