Paired 68000 systems - was Re: out-of-mainstream minis

[Toby Thain]

On 2015-07-03 8:09 PM, Glen Slick wrote:
> On Jul 3, 2015 4:59 PM, "Johnny Billquist" <bqt at update.uu.se> wrote:
>>
>> I find it hard to believe it was a plain 68K in there. That CPU have some
> serious issues that makes it close to impossible to implement virtual
> memory or proper usermode protection.
>> (Yes, it can be done, but the amount of hardware required means most did
> not. I think SUN did it with their own MMU, and an extra CPU in there.
> Trying to remember who else - I seem to remember one other company who
> actually used a plain 68K, and it was not Unisys.)
>>
>
> Apollo is the classic example of using plain 68K (two).
>

I always associate it with Tandem:
http://www.hpl.hp.com/techreports/tandem/TR-86.2.pdf

--Toby