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I amselling an already assembled 4MB upgrade kit for the Atari 520 ST and 520 STmupgrade board kit.
With this upgrade youcan take your stock 256kb or 512kb Atari 520 ST up to 4MB of RAM.
This kit is not for anovice. You need to carefully remove all 16 RAM chips from your stock board andclean the pin holes out so this new board fits into place. If you do not havethe Soldering skills do not attempt this upgrade. I am not responsible for anydamages you do to your system.
Kit includes plenty of 30 Gauge wire-wrap wire and extra gold turned pin headers in case you make any mistakes.
I had these boards madeso I can upgrade my own 520 ST and only have a few spare boards. Once they sellI have no plans on making any more. This is a one time run of these boards.Installation
·De-solder the existing RAM.
·Solder the expansion board in place.
·Solder the four wires from the expansion
board to the motherboard.
FOR BEST RESULTS CONNECT ALL 4 SIGNAL WIRES DIRECTLY TO THE MMU VIA THE UNDERSIDE OF THE BOARD!
Design ofthis board by Anders Granlund
4MB RAM upgrade
I havebeen selling on for over 23+ years. Please see my response. Contact mewith any questions before making a purchase.