At 23:32 -0400 10/01/2002, PCI PowerMacs wrote: >From: [EMAIL PROTECTED] >Date: Tue, 1 Oct 2002 19:17:29 EDT
>Very early production often uses "UV erasable" EPROMs (usually eight) rather >than "mask programmed" ROMs (usually four), in a ROM SIMM [ * ]. There are some "ROM" modules (really firmware modules) running around with Flash chips on them. They probably weren't from production runs though. I'd guess they were internal Apple development tools used for quick testing of firmware revisions. Still, they've managed to "escape" into the hands of non-Apple folk. I've seen modules with four, eight and even sixteen chips. The sixteen chip module had a little XOR gate to handle the CE so that they could be used in two banks--high address and low address. Jeff Walther -- 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
