Paired 68000 systems for fault tolerance - was Re: out-of-mainstream minis

Toby Thain toby at
Sat Jul 4 10:09:20 CDT 2015

On 2015-07-03 11:13 PM, Jon Elson wrote:
> On 07/03/2015 09:11 PM, Toby Thain wrote:
>> On 2015-07-03 8:09 PM, Glen Slick wrote:
>>> Apollo is the classic example of using plain 68K (two).
>> I always associate it with Tandem:
> Not sure what you are referring to, here.  Tandem did not use 68K
> processors as the main CPU
> in any of their machines.  (There could, possibly, have been 68Ks in
> some of the peripherals.)

Yes, you are right. The report gives some examples of dual 68000's in 
Tandem's peripheral subsystems.

I likely was thinking of Stratus, because I remember reading this before:

Also Sequioa, who also used two 68000's operating in lockstep, described 
in P.A. Bernstein's paper that is comprehensively paywalled :(


> They had their own 16-bit mini architecture, loosely based on HP's stack
> oriented minis.
> Jon

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