I've seen a lot of talk about memory technologies, but as far as I can see, no one has offered any complete solutions.
One already exists, thanks to the efforts of Steve Lafferty, Vince Slyngstad, and others. http://so-much-stuff.com/pdp8/32KOmnibus/32KOmnibus.php Yes, it uses a battery. FPGAs and CPLDs are not needed (though a CPLD could reduce all of the logic and drivers to a single chip, with the ATF1508). Numerous Omnibus PDP-8 owners have these cards, and I swear by them in my machines. I'd much rather keep a hefty load off of the power supply and free up 11 card slots, especially in my 8/M. Maybe with enough interest, Vince would consider doing another run of boards. Thanks, Kyle
