Don't be concerned. I long ago dismissed the Rev. C module from my thinking for the reason above, but there are others who will bless you for the opportunity to get one. After all, when the Rev. C was current, batteries were also, but the life of batteries is shorter than that of the module. Keeping my batteries (seven for three PB 5x0s) alive is a full-time job, for which that second bay is too important to 'waste' on a PCMCIA module when I also have AAUI/RJ-45 adapters aplenty.

de