On Wed, 5 Apr 2000, Richard B. Johnson wrote:
>On Wed, 5 Apr 2000, Bob Lorenzini wrote:
>> On Wed, 5 Apr 2000, Richard B. Johnson wrote:
>>
>> > Upon startup Win/NT writes to (most) all RAM above 1 Megabyte, then reads
>> > it back. You can watch this with a logic analyzer. It does this with
>> > parity-check disabled and, FYI, never enables it after.
>> >
>>
>> Your saying parity memory is totally useless on Win/NT?
>>
>> Bob
>
>Well. It may be useless on most modern RAM. I haven't seen any
>RAM, rated at 100MHz or higher (P100) that even has the extra bit.
>
>The last time I saw parity RAM was the 65 ns stuff. PC RAM Vendors,
>when questioned, have responded; "It's now built-in...". Which
>translated means; "Missing...".
>
>None of the PC stuff ever corrected RAM errors with a CRC, even though
>there was some RAM called "ECC" RAM which implied that it did. The
>ECC RAM just accumulated bits from multiple columns to save parity
>bits. It still hit MNI when it detected an error. Alpha and Suns
>have (or had the last time I looked), real ECC RAM.
Are you sure? I have PC100 ECC SDRAM. My BIOS claims the ability to
correct single bit errors and catch (NMI) two bit errors.
There is a BIOS setting to the effect of "cause NMI on single-bit
correction."
Dave
David Whysong dwhysong@physics.ucsb.edu
Astrophysics graduate student University of California, Santa Barbara
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