On Sat, Oct 14, 2017 at 5:05 AM, Ethan Dicks via cctalk <[email protected]> wrote: > Hi, All, > > I have some Hitachi parts, marked 21-18470-01, that I pulled from a > DEC Professional 350 on an upgrade to 256Kx1 DRAMs. I am trying to > track down a specific thing about them. I found a vcfed.org post > about these same type chips in a DEC Rainbow and the question (but not > firm confirmation) that they could be Hitachi 4864s based on DEC parts > lists.
Alas all I can tell you (from looking at the schematics) is that the Rainbow does full 8 bit refresh on both the motherboard and the RAM expansion board. So these ICs might be 7 bit refresh (since those would work with an 8 bit refresh address), they might not -tony
