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- John de Bruin (j.bruin@auckland.ac.nz) wrote:
- : Why is this different from clock doubling as in the 486DX/2 CPU?
- : And the BCLK is used for all bus timing, whereas the PCLK is used for
- : internal processor logic timing.
- : Now as far as I can tell the only difference between this and the DX/2,
- : is that the DX/2 only has one clock and uses a clock 2x multiplier to
- : derive the internal processor speed. Why do the two clocks on the '040
- : _not_ have the same effect as clock doubling?
-
- On a 486, the machine commands are executed with (internally generated)
- PCLK, on the 68040 only very few parts of the processor (eg some parts
- of the arithmetic unit) are using PCLK, the rest is running at BCLK.
-
- So, the 040 doesn't use the higher clock as much as the 486 does.
- This has nothing to do with efficiency, btw.
-
- --
- | | | MfG MOW []-) Leobener Str.4, App.6-15, 28359 Bremen, ++49-421-210492
- | | | Atari Computer Team e.V. Bremen od. ++49-177-2503055
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-
- From owner-paper Fri Feb 2 11:15:43 1996
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- From: stalker@bsbox.com (Stalker)
- Newsgroups: comp.emulators.mac.executor
- Subject: Re: Using Mac CD-ROMs
- Date: Tue, 30 Jan 1996 07:08:46 GMT
- Organization: hAcKiNg uNlImItEd
- Lines: 41
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-
- churchill@cybercom.net (Red October) wrote:
-
- >"Karl D. Fleischmann" <AHIPC1J.KFLEIS01@eds.com> wrote:
-
- >>I have the demo version of 1.99q running on a 486DX33 with a Sony IDE
- >>CDROM Drive. I have some Mac CD's that I have been trying to run but it
- >>doesn't seem to recognize them. Has anyone tried this or gotten this to
- >>work? Is this something that should work? I scanned the FAQ but didn't
- >>see anything about using MAC CD's.
-
- >>I am able to read some DOS CD and other Windows CD (see the directory at
- >>least). I am using WIN95 and I've tried running it under windows and
- >>also tried to run it when booting to dos neither could recognize the Mac
- >>CD's.
-
- >>Any help is apreciated.
-
-
- >>Thanks
- >>Karl
-
- >I think you need a SCSI CD-ROM drive to look at/use Mac CD-ROMs.
-
-
- >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- >Red October
- >churchill@cybercom.net
-
- >"Scientists tell us that the fastest animal on
- >earth, with a top speed of 120 feet per second
- >is a cow that has been dropped out of a
- >helicopter. How long, traveling at top speed,
- >will it take the cow to travel 360 feet?"
- > -Dave Barry Slept Here
- >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
- Nope, don't need a SCSI drive, I got a proprietary interface, and mac
- cds work fine.
-
- Stalker
-
-
-