17 Mar
2015
17 Mar
'15
6:22 a.m.
On 2015-03-17 13:43, emanuel stiebler wrote:
On 2015-03-17 13:34, Johnny Billquist wrote:
I guess, everybody who has a 11/70 toyed/played with this idea.
Yeah... :-)
On 2015-03-17 01:10, Eric Smith wrote:
> Noel Chiappa wrote:
It would
probably be difficult or impossible to obtain a PEP70 (with
or without HC70) at this late date. The 11/70 memory bus (between the
CPU and memory box) is quite simple, so it should be very easy for
someone with reasonable hardware expertise to design and build a
modern memory board for it, comparable to the PEP70.
I have from time to time played with the thought...
An 11/70 with the PEP70/HC70 combo would probably draw the same as an
11/45. And you'd have a much sweeter machine.
But you need few people who would pitch in to make the
boards ...
Making just a replacement for the PEP70 would be easy, I think. Just
interface the 11/70 memory bus.
The more interesting one would be the HC70 style thing. Make all memory
work like cache.
That would require ripping out the existing 11/70 cache, and replace
those boards. Means you need to interface to the whole CPU. But the
gains would be much larger.
I guess it is possible. You just need to read the 11/70 drawings and
manuals, to figure out how the cache works and interfaces with the rest
of the CPU.
I would definitely be interested in helping out, but I do not have
enough time at the moment to do much of the work myself.
Johnny