On Fri, Sep 2, 2016 at 2:44 PM, Paul Koning <paulkon...@comcast.net> wrote: > Incidentally, the Pro technical manual says that the daughterboard can be up > to 2 MB (but DEC only offers 512 kB). It doesn't say how that is done. It > looks like the answer is that there are four RAS signals, so you can have > four banks, 256k by 16 each.
Hmm... 2 Daughterboards at 2MB each? A full 22-bit boat of RAM? Sweet! I have more than one Pro - I started upgrading one with 256kbit DRAMs. I also had a PSU smoke on my Pro380 and got a replacement but haven't installed it yet. I'm already in "repair all the PDP-11s" mode, so I'll add it to the stack. Someday, I'll get 2BSD up on at least one of them (for now, I have RT-11 and Venix) -ethan
