The PDP11/04 has landed..
mattislind at gmail.com
Mon Feb 8 11:05:38 CST 2016
>> 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.
> (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.)
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