Prints for an 11/70

From: jpero_at_sympatico.ca <(jpero_at_sympatico.ca)>
Date: Tue Dec 11 15:49:43 2001

> From: Dave McGuire <mcguire_at_neurotica.com>
> Date: Tue, 11 Dec 2001 21:13:30 -0500
> To: classiccmp_at_classiccmp.org
> Subject: Re: Prints for an 11/70
> Reply-to: classiccmp_at_classiccmp.org

> On December 11, Boatman on the River of Suck wrote:
> > > Would 200MHz be fast enough ? A lot of the Xilinx fpga's offer 5ns pin to pin
> >
> > In a word, no. 8-)
>
> Jeeeeezus Sridhar, how fast did you have in mind?

That rate, if Sridhar is looking at sub 5ns pin-pin, he's looking
at around 50 to 100MHz. Just my SWAG. FYI: PII 233 has 7ns
sync-sram cycling at 133MHz.

If true, that would be blisteringly fast PDP11/70 on size of a small
12" x 12" board roughly.

That means putting in certain lengths of critcial traces to get
timing come together at right moment (hence the zig-zag traces), low
voltage swings, 2 levels of caches, etc.

Blatent easy way out is emulate that 11/70 on athlon XP 1900+. :-)
Smack me if you dare. :-)

Cheers,

Wizard

> -Dave
>
Received on Tue Dec 11 2001 - 15:49:43 GMT