hilpert at cs.ubc.ca
Fri Nov 5 23:28:05 CDT 2010
On 2010 Nov 5, at 4:39 PM, Chuck Guzis wrote:
> On 5 Nov 2010 at 17:12, Brent Hilpert wrote:
>> I'm not familiar with the B5000 implementation (did I miss it in the
>> thread already?), but I did try to avoid restricting the def to that
>> of paging.
> The B5000, circa 1961 was an amazing bit of equipment. Read about it
> here, then compare with later systems.
> Makes the PDP-11 seem like a pile of Tinker Toys in comparison.
Well, you have to love a machine with a "HEYU" instruction (get the
attention of another processor).
I was aware of many aspects of the B5000 series, from AotHoC articles,
but not with the VM implementation technique. The article mentions the
use of a descriptors to indicate memory segment availability, but
doesn't describe much of the VM beyond that. It doesn't make it clear
when VM was actually implemented, I had always been led to believe the
ATLAS was the first VM machine, in the early 60's.
Outside the B5000 topic, it is amusing to read the writer's advice in
1982 of "Machines worth keeping an eye on are the iAPX-432 and the IBM
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