Today I upgraded an Atari 520 ST+ for a friend of mine with Exxos 4MB RAM. First had to remove all the old DRAM’s. After that I placed the RAM upgrade. I didn’t make any pictures of the assembling of the riser board, see links below.. More information: http://www.exxoshost.co.uk/atari/last/4MBMMU/index.htm http://www.spiny.org/atari/photos/exxos_4meg_stm/