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5 total messages Started by Larry Tepper Tue, 04 Dec 1984 20:31

#146

Author: Larry Tepper
Date: Tue, 04 Dec 1984 20:31

5 lines
711 bytes

... Honk if you hate the IBM PC
-- 
One of the survivors...
{ihnp4 hao philabs sdcrdcf ucbvax!nbires}!stcvax!lat	Larry Tepper
Storage Technology, MD-3T, Louisville, CO 80028		303-673-5435

No memory management hardare?

#155

Author: Nick Flor
Date: Wed, 05 Dec 1984 20:21

6 lines
796 bytes

Does the macintosh have any memory management hardware?
ie.hardware for multitasking et al. multiprocessing stuff.
If not, is there any way, under program control, to interrupt
the processor?

-Nick Flor

Re: No memory management hardare?

#98

Author: Jonathan Shapiro
Date: Tue, 11 Dec 1984 04:05

10 lines
915 bytes

[Aren't you hungry...?]
	It is my understanding that no memory management hardware exists in the
Mac as distributed, but it occurs to me that there may be a 68010 pin for
pin replacement for the processor which might be made to do the trick....

Just a thought, I haven't tried it.

Bout time somebody started net.micro.mac.

Jon Shapiro

Re: No memory management hardare?

#172

Author: Rob Warnock
Date: Fri, 14 Dec 1984 09:43

26 lines
1756 bytes

+---------------
| 	It is my understanding that no memory management hardware exists in the
| Mac as distributed, but it occurs to me that there may be a 68010 pin for
| pin replacement for the processor which might be made to do the trick....
| Jon Shapiro
+---------------

Sorry, a 68010 has no memory management in it, either. (For that matter,
neither does the 68020.) The '010 indeed IS a pin-for-pin replacement
for a 68000, but the ONLY difference as far as memory management goes
is that the '010 saves enough stuff on the stack when you get a "bus
error" trap (say, from a page fault) that you can re-start (actually,
continue) the affected instruction. The 68000 saves SOME stuff, but it's
not enough to always unambiguously continue.

All of the 680XX processors use an external MMU in order to do virtual
memory. (I actually prefer this, as sometimes you want to do it differently
than the way the chip maker provided.)

Rob Warnock
Systems Architecture Consultant

UUCP:	{ihnp4,ucbvax!dual}!fortune!redwood!rpw3
DDD:	(415)572-2607
Envoy:	rob.warnock/kingfisher
USPS:	510 Trinidad Ln, Foster City, CA  94404

Re: No memory management hardare?

#189

Author: Henry Spencer
Date: Tue, 18 Dec 1984 21:25

8 lines
907 bytes

> All of the 680XX processors use an external MMU in order to do virtual
> memory. (I actually prefer this, as sometimes you want to do it differently
> than the way the chip maker provided.)

Damn near always, if one substitutes "Motorola" for "the chip maker".
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry

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