[EMAIL PROTECTED] wrote: >Am I correct in assuming that the PowerBook Duo 2300c uses the same RAM >cards as the previous Duos? I don't see anything in the Apple manuals & >developer notes that suggest different. >Since those RAM chips are 32-bit wide (I presume), & the 2300c has no L2 >cache, on top of that, that would lead to pretty gruesome performance. (I >am vaguely considering upgrading a 270c, but am afraid that I will merely >have exchanged the best of the '030 PBs (as such things go) for a lousy >PPC PBook (as such things go). A 280 LB upgrade will require a 280 chassis as well, the heatsink is different. My advice would be to leave the 270c as-is but keep yer eyes out for a maxed-ram 280/c, or better, a maxed-ram 2300c.
RAM cards for earlier Duos work in later Duos, but larger/later cards may not be able to be completely utilized in earlier Duos. Some devnote quotes: (Duos 210-250) "Third-party developers using 16-megabit DRAMs can develop expansion cards that extend capacity to 24 megabytes." (Duo 270C) "8 MB memory expansion card expands memory capacity up to 12 MB; third-party SIMM (single inline memory) card expands memory capacity up to 32 MB." "In the PowerBook Duo 280 and 280c computers, the RAM expansion connector has an additional signal, RAS(7) on pin 24, that provides addressing for up to 36 MB of expansion RAM. A RAM expansion card for the newer machines also works in the older machines, except that any RAM over 32 MB is ignored." "The RAM expansion card for the Macintosh PowerBook Duo 2300c computer is compatible with the one used in earlier PowerBook Duo models. The computer accepts up to 48 MB on a RAM expansion card." -summary for your viewing pleasure- model baseram max ram Duos 210/230/250 - 4 MB 24 MB Duo 270C - 4 MB 32 MB Duo 280 + 280c - 4 MB 36 MB Duo 2300c - 8 MB 56 MB As for 68K vs. PPC, speed depends on whether the app in question is native PPC or must be emulated. Well written native-PPC apps will almost always be faster than the 68K version was on a 68K Mac. Should one upgrade thus depends on what apps one intends to use. A big problem with the 2300c however is PPC code is always larger than 68K code, so if the 2300 in question doesn't have roughly double the ram of the previous 68K Duo it will surely disappoint. 48MB cards can be hard to find and rather pricey. If there's one thing overwhelmingly in the 2300's favor, it's the ability to natively use newer/larger/faster ATA disks. A modern drive speeds everything up in a 2300, making a tremendous positive difference in usability. Dan K (now with a nearly-perfect Duo - 2300/56/10g/OS9.1/mono-TFT-screen/NetDock) ................................. http://macdan.n3.net/ carracho://dankephoto.dhs.org:9700 hotline://dankephoto.dhs.org:9500 ................................. -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.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/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
