TGB1718 Posted August 29, 2019 Share Posted August 29, 2019 I have an old 520ST that I bought from new, I upgraded the memory to 1 Mb way back in the 80's by piggy backing the extra RAM on top of the existing 512K. It worked fine for all the years I used it, but after many years of storage in not ideal conditions and it powers up and says 512K of RAM. I have checked all the solder joints both on the motherboard and the piggy backs and they look fine. I have put a scope on each leg and compared waveforms, again nothing obvious. I know I could just replace the chips as its likely to be a faulty RAM chip, but is there a memory upgrade for a 520ST that replaces the existing RAM, preferably with more than 1Mb. Maybe something like the Ultimate 1Mb upgrade for the old 8 bit that I've just fitted in my 130XE, but obviouly more memory. Thanks in advance Quote Link to comment Share on other sites More sharing options...
anzac Posted August 29, 2019 Share Posted August 29, 2019 Check here: https://www.exxoshost.co.uk/atari/last/storenew/ Quote Link to comment Share on other sites More sharing options...
+SoulBuster Posted August 30, 2019 Share Posted August 30, 2019 There is also a pinned post with lots of links to such items. Quote Link to comment Share on other sites More sharing options...
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