>> I assume they didn't buy a service contract with that machine? I doubt > DEC would be real happy with that. Also, the 64K RAM chips need an extra > address pin, were the boards laid out with that signal already in place? >
Probably not since the new address signal used to be the +5V supply voltage (on 16 k chip) which one could assume is connected using one of the middle layers of of a multilayer PCB. As mentioned earlier in this thread I did such a conversion on a MSV11-D board more than 25 years ago and then I had to lift up this pin and connect it via an extra wire. /Mattis > > (I seem to recall on the VAX 11/780 they had different array boards and > memory controller when going from 4K to 16K DRAM chips.) > > Jon > >
