I am very new to this forum. I am just now getting reacquainted with the ST after about 20 years.
My favorite model is the original 520ST. Specifically, the 520STm. I really really like this machine. I want to use it as my "main" ST. I am in U.S. so this is a Yankee model.
I bought launch model back in 1985. EVERYBODY was doing the "piggyback" 1MB RAM upgrade, even local Atari dealer in Anchorage, AK did this nonstop every business day. While as much memory as is easily possible would be nice, 1MB is enough, and it was my assumption this would be easiest. Atari did not sell "520ST+" here but it is my understanding this was a factory machine with the piggyback.
I have searched (Google, as well as this forum) trying to find a text file, or better yet a PDF of good instructions on this mod and I have no luck. I did manage to find this thread on atari-forum, from 2004:
http://www.atari-forum.com/viewtopic.ph ... 04&p=31664
Unfortunately, the thread is not complete and was locked. There was a user called "DoomMaster" who was attempting to do this very mod and it looks like they were not in good standing here and I am guessing that has something to do with the thread being locked????
I contacted Best Electronics (California) and asked about this mod. I thought perhaps they would sell a kit with the 41256 DRAMs (is this correct?) and some instructions, or perhaps perform the upgrade for a fee. I received back the following reply"
Discouraging. So it is not looking good. I did ask about other possible upgrades but did not get a specific answer; I am led to believe what I desire - 1MB 520STm is a black sheep that I may not have?A. Our Atari 25+ year Super Tech does not recommend this 520ST Ram Upgrade. When they do go bad (and they do) they are about impossible to repair. Our Super tech will not even touch one that comes in for repair.
Can somebody point to a diagram of this mod, or suggest an alternative? The 72-pin SIMM mod that I saw looks very complicated for me. Are there other users who may have suggestions? As popular as this mod once was, I am stunned at its obscurity today.
Are the RAM upgrades for the STfm series different and incompatible with the old 520ST? If there is one that works, can somebody smarter than me please tell me about it - what it is called and where it is available? I hate to think I have to give up on this, as my heart was set on the original ST. Thank you very much!!!!