This has become the new standard in RAM upgrades for the ST/F/M Series. The 4MB DRAM board plugs in over the top of the MMU socket. The shifter adapter (where some signals are taken from) is not fully assembled as some shifters are not in sockets, and some want to put the shifter in a socket, and some don't. Though generally that board is simple to construct. The main challenge is removing the shifter IC if it is soldered into the motherboard.
This upgrade can switch between 1MB and 4MB ST-RAM. It's a compact solution and a lot neater and reliable than any other RAM upgrades such as the Marpet types which generally have a large simm adapter board and ribbon cables everywhere.
I have started a new production batch of these as they have sold out now. These should start appearing in my store again in the near future.
STORE LINK
https://www.exxoshost.co.uk/atari/last/storenew/#0035
WEB PAGE INSTALL GUIDE
http://www.exxoshost.co.uk/atari/last/4MBMMU/index.htm
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