Shmuel Metz , Seymour J. wrote:
In <[EMAIL PROTECTED]>, on 04/21/2006
at 03:48 PM, "John S. Giltner, Jr." <[EMAIL PROTECTED]> said:
1) Any OS can support the hardware clock for the platform it is
running on to be set to local time or UTC.
Alas, no.
I guess my wording is a bit unclear. I did not mean to imply that any
OS does actually support this, but I meant to imply any OS could be
written to support it.
It does not matter if it is a mainframe, a RISC box, PC, MAC, or any
other computer platform. It does not matter if it is Linux, z/OS,
AIX, HP-UX, MPE, z/VM, z/VSE, Windows, or any other OS.
Yes it does.
Why? Logically, not technically, if the OS is written to allow the
hardware clock to be set to one time and then provide a software offset
to for a different time, why would it matter what OS was running on what
hardware. Linux (logically) does the same thing on zSeries, pSeries,
iSeries, Sparc, as it does in PC and last time I checked PC's do not
have TOD's and zSeries does not have CMOS/RTC clock. But Linux still
can get the time of day and keep track of the time the same on both
platforms, in fact on any platform that it runs on.
I personally do not know of any comptuer system that does not have a
'hardware' clock (TOD, CMOS, RTC, whatever you want to call it).
The issue is semantics, not nomenclature. The PC does *NOT* have an
equivalent of the zSeries timing facilities, regardless of
nomenclature.
Again, logically, aren't they are providing the same function. Telling
the OS what time it is? Just because one is not as accurate as another
or always used in the same exact manner. Some OS's have deciced that
they will get the time when they are started and keep track of it
themselves, other OS keep going back to the "hardware" clock. Is this
not true?
As for you link below, unless somebody knows for a fact we would be
assuming/guessing, just like you could do.
I know for a fact that you have been assuming and guessing.
Well I beleive that I have been looking at it from a logical, not a
technical point of view. A TOD clock is a clock, just like a RTC, and
just like the watch on my wrist. Technically how it performs its job is
different, but its purpose it to keep track of the advancement of time
and provide something with the value of what time it has. Or am I
wrong, does a TOD clock provide some other purpose that providing the time?
I don't beleive the person that started this originally was looking for
the technical details of exactly how things worked. I beleive he was
looking for a general/logical comparsion. IMHO a TOD clock and a
CMOS/RTC clock provide the same logical function. Just like a bycycle,
a car, a train, and and boat, can both be forms of transportation, but
they are not the same exact thing, nor do they all work in the same
exact way.
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