sundar@cwruecmp.UUCP (Sundar R. Iyengar) (05/06/86)
>> >Now, if only somebody would invent an architecture where all objects, >> >including dynamicly allocated objects, are isolated in memory, then any >> >subscript error would cause an immediate memory fault. >> >> If I'm not mistaken, this was done on the iAPX432, using a capability- >> based addressing scheme. Dimmed the lights. You could probably construct >> such an environment on the 80286, but no one does, probably for efficiency >> reasons. > One problem with the 432's approach was that it was very extreme; I don't > think it's good to say "the 432 tried these approaches and it was too slow, > therefore the checking can't be efficiently implemented." If I remember correctly, iAPX 432 is a vertically microcoded machine. On top of that, the microcode is generated in one chip and then used in another. These two are some more reasons why iAPX is slow. -- sri
davidsen@steinmetz.UUCP (Davidsen) (05/13/86)
Since someone brought up the 432, is there (was there?) ever any
general purpose computer based on it? I know there were a bunch of
specialized machines produced in limited quantities (1 or in some
cases).
--
-bill davidsen
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"Stupidity, like virtue, is its own reward"