On Thu, Oct 15, 2020 at 10:52 PM Chris Zach via cctalk <cctalk@classiccmp.org> wrote: > Next up is the 11/24, > this is one of the 5.25 inch rack mounts with a CPU, KT24, and no memory. > > First question: Will ODT respond at all with no memory on the Unibus?
I don't recall. I think so but it's possible it won't. ODT works from my 11/34 with bad RAM, but I've never tried any machine with no RAM. It doesn't help that different models have different implementations of ODT. > Second question: Can a 128kw memory board from an 11/34 work in an > 11/24? Or do I need one of the 11/44 boards to make it go? AFAIK, you should be able to use that 128kw memory board just fine, but I don't recall if they play nice with the KT24 in going over 18-bits. I have a couple of 1MB boards in my 11/24 (they were not cheap in the 80s) which I got after I got a KT24 (all so I could run 2BSD). I'd consult the KT24 technical manual to see how it works, and the 11/24 manual to see what memory cards DEC supported. I don't remember having any particular difficulties with configuring my 11/24 but I wasn't doing any mixing and matching. -ethan