[rescue] newest rescue

Romain Dolbeau romain at dolbeau.org
Wed Feb 3 14:27:17 CST 2016

2016-02-03 21:09 GMT+01:00 Toby Thain <toby at telegraphics.com.au>:

> Or memory protection.

Well, the original 68000 (at the heart of Lisa, Macintosh, Macintosh 512,
Macintosh Plus, Macintosh SE and so on) didn't really support an MMU or
memory protection. And the original Macintosh only had 128 KiB of memory,
running multiple programs needing protection from each other wasn't exactly
high priority on something that was basically a cheap, entry-level Lisa.
The entry-level Macs were much, much cheaper than the cheapest Sun of the
same era.

Sun switched to the 68010, like everyone else in the Unix business, to get
MMU support.


Romain Dolbeau

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