Guys that board has been superseded by the “RAM & ROM” board. See here:-
http://s100computers.com/My%
20System%20Pages/RAM+ROM% 20Board/RAM+PROM%20Board.htm
There is nothing particularly wrong with that board (except it is somewhat a bit of a pain to figure out the correct jumpers) but the newer board has things much more organized and has onboard battery backup capability for the static RAM. While it is fine as is, there are a few really minor tweaks that would be nice:-
1. Connect pin 12 of U1D to pin 6 of P31
2. Have ground pin option for pin 20 (CE) of U123
3. Change the order of pins on K2 to avoid the need for wire-wrap
4. Remove bA14 label on U100 and U101 and join U100 pin 28 to U101 pin 28 (both go to P14,7).
If Andrew has time to splice these in, it might be worth waiting for. If so let’s call this board “V2 “
John