Low cost 4MB RAM UPGRADE kit for later STF/M motherboards. Fits under the PSU section. Simm itself fits to the right of the PSU and to the left of the shifter housing. Some minor metal editing on the atari top metalwork will be needed. PCB can be switched from 1MB to 4MB for software that will not run on 4MB.
HOME PAGE
http://www.exxosforum.co.uk/atari/last/4mb/index.htm
STORE LINK
https://www.exxosforum.co.uk/atari/store2/#0020