2 Jun
2014
2 Jun
'14
2:29 p.m.
On Jun 2, 2014, at 10:24 AM, John Cowan <cowan(a)mercury.ccil.org> wrote:
Ronald Natalie scripsit:
Yeah, you're right. You could get it off-chip with the -010 or it was integrated
with the -020.
Still with all it's flaws, on the 286 and
later UNIX actually did run in
protected mode, something it took ages for DOS/Windows (one can argue
backwards compatibility with the early processors) or Apple (no excuse
here, the early Macs were 68000's which had protection) to pick up upon.
The original Mac 128K was a 68000 processor, and IIRC memory protection
didn't arrive until the 68020.
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