Qbus split I&D?

[Guy Sotomayor]

> On Mar 17, 2015, at 12:32 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
> 
> On Tue, Mar 17, 2015 at 3:03 PM, Christian Gauger-Cosgrove
> <captainkirk359 at gmail.com> wrote:
>> True, SRAM would be cheaper...  a massive upgrade to the PDP-11/70s performance
>> in place of its normal MOS memory or core memory
> 
> You can get some pretty fast SRAM for not much money, and 4MB isn't
> "that much" in terms of part count.
> 
> I'd love to replace an MK11 and several cards with that PEP70, but I
> doubt I'll ever see one.
> 
> As for MRAM, unless you have a full front panel, I don't think
> non-volatility is as important as raw performance.  Sure... it's nice
> to be able to walk up and turn the key (I do that on a PDP-8/L with
> power-fail restart) but really... how hard is it to log in, shut down
> the OS then power off?  I'd rather have a faster machine while I'm
> using it.

Hmm.  Maybe I should consider building a PEP-70 clone (I already
have a PEP-70/Hypercache in my 11/70).  It shouldn't be too hard
to do (as has been mentioned before).

TTFN - Guy