I got an answer for you direct from Phil Budne, the lead developer of the Fastpath 5 (I figured I'd ask as I was seeking other technical info):
U45 is EVEN and U46 is ODD. I'm awaiting more information but the jumpers he is talking about are likely the ones labelled "EPROM Select" on the PCB.
http://retro.icequake.net/fastpath/shivadocs/fastpath.html gives the socket info which I'll duplicate here.
U45 is EVEN and U46 is ODD. I'm awaiting more information but the jumpers he is talking about are likely the ones labelled "EPROM Select" on the PCB.