My guess is Rottendog was having trouble finding DIP SRAM so they used a pin out adapter board. It is probably just a straight SO28 to DIP28 adapter board but the chip is on the bottom. Not sure why they double stacked a socket.
Unless Rottendog did something unexpected, a FM1608 based NVRAM should drop in and work even if board jumper is set to 62256 (no CE2 on FM1608)
Quoted from barakandl:Not sure why they double stacked a socket.
barakandl probably to prevent the board mounted socket from being damaged by the legs they put the RAM module.
I use this method to prevent even machine pin SIPs from damaging sockets.
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