In a message dated 5/23/02 1:20:13 AM, [EMAIL PROTECTED] writes:
<< in some FAQs on the Apple site you can find these infos : 16) Question: What is ECC memory and do Macintosh computers support it? Answer: Macintosh computers do not support ECC memory. ECC (Error Correction Coding) memory has additional check bits for each byte. This entails the memory controller calculating and writing error control check bits on each memory write operation, and recalculating and comparing the check bits on memory read operations, and then if necessary correcting the bad bits. As opposed to parity, this can automatically correct single bit RAM errors. >> No Apple ever supported ECC, but then very few Apples ever supported parity generation and checking (the IIsi, Q900/Q950/WGS 95 and all Apple Network Servers did). [ "Does ] not support ECC memory", in this case, means Apple products do not support the generation and checking of the ECC polynomial, and so not support the correction of memory failures upon discovering such a failure in combination with the availability of a valid ECC polynomial, thereby causing the putatively "bad" memory cell(s) to be rewritten and thus causing that "bad" memory to be made "good". Just as most a Apples which, on paper, required 30- or 72-pin non-parity SIMMs would gladly accept parity SIMMs, it is certainly possible, indeed it is highly likely that Apples will accept ECC DIMMs, if all other requirements are met, such as 5-volt power operation and FPM or EDO mode accessing, in the same 168-pin package. The extra ECC bits (usually 5) will simply be ignored, much as the extra parity bits (1 or 4) were ignored in the 30- and 72-pin cases. -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
