The official Digital litterature says, 33 bit 60ns installed in pairs. 36 bit can be substituted. I have run a few of the 200's in my day :) they digest most full parity 72 pin simms 60 or 70 ns. > FPM means "not SDRAM, not EDO" > > Parity comes in two flavors - 33 bit and 36 bit. > exactly. -Mike N