At 01:05 +1000 02/16/2003, Paul Shand wrote: >I thought the CUDA was the same as the ZAP the PRAM function but >obviously not. > >Anyone know why?
PRAM stores systems settings that go all the way back to the Mac Plus (probably with additions by now :-) ) in a chip based on teh Motorola 6502 microcontroller (IIRC). The PRAM is physically in a chip called the CUDA chip on the PowerSurge machines which is labeled 341S0788. This chip also controls the ADB bus. The NVRAM primarily stores a file called NVRAMrc which is modifications to Open Firmware. The NVRAM is stored in an 8K X 8 SRAM chip usually labeled Winbond W2465-70LL (I'm a little hazy on the that part number, too lazy to go check). So the CUDA button tends to reset (cut power to) the SRAM chip where the NVRAM contents physically reside. The PRAM zap tends to reset the stored parameters in the CUDA chip. I think there is some overlap. E.g. both seem to reset the clock. It would be nice some day to see an exact listing of which parameters are affected by each type of reset. Jeff Walther -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.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/supermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
