Prints for an 11/70

From: CLeyson_at_aol.com <(CLeyson_at_aol.com)>
Date: Tue Dec 11 18:44:25 2001

On December 11, Boatman on the River of Suck wrote:

>Yeah. I wasn't actually trying to build it using any specific technology.
>What I am doing is taking the latest and greatest and building a PDP-11
>compatible (one that act's *exactly* like an 11/70, but faster). I am
>probably not going to be using FPGA's, because I don't think they're yet
>making FPGA's the speed I want them to go.

Would 200MHz be fast enough ? A lot of the Xilinx fpga's offer 5ns pin to pin
delay. I'd be interested in finding out about the 11/40 architecture - was it
a
bit-sliced design, how deep was the pipeline etc.?

I'm going to have a go at an HP21XX machine of some description next year.
It's just going to emulate some of the HP custom processors and speed isn't
going to be an issue. BTW the HP2116 Cordic Co-processor ran with a cycle
time of 200ns - not exactly fast - add/sub 50-100us mpy/div 100-150us. Yawn.

Chris Leyson
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