> From: Gamba <[EMAIL PROTECTED]> > Why would 4 each 16 MB 70 nS ram simms work OK in a IIci and not work in a > SE30?
Gamba, go to: http://www.biwa.ne.jp/%7Eshamada/fullmac/repairEng.html Look at section 8 (Jail Bar Pattern or Smile Mac in Jail). There is a table that gives memory combinations for the SE/30. Note that 64Mb in bank A only (i.e. nothing in bank B) has the comment "No Good". I don't understand why, but as a result I tried the combination of the 64Mb in bank A and 4Mb in bank B and it worked no problem. My 64Mb have the same part number as you, and I got them from Ebay also. <switch to education mode> The KM41C16000AJ-7 is a 16M by 1 dram, with a 4K refresh requirement. That means that its 16,777,216 cells are organized as a square array 4096 rows by 4096 columns. Each DRAM cell must be "refreshed" (accessed) within a specified time or its contents will "fade". You refresh all the cells on a row when you access any cell on that row, hence the 4K refresh spec. I'm not sure about modern PC's but the older ones used to require 2K refresh DRAM. It's all down to how the memory controller is designed. 2k refresh DRAMs would work in a 4K system but not the other way around. <switch to sarcasm mode> I asked the question about what the DRAM refresh requirement was for Macs on this list a few weeks back and only got one reply. The Pickle said if it wasn't too tall it should work. Now while this seems to be the case, it's not a very satifiying technical explaination ;-) Sorry Pickle, couldn't resist, I DO appreciate your inputs. <switch to engineering mode> Anyway, slam something in bank B and they seem to work! <switch to mac addict mode> So now I have 68Mb of ram :-) The question is how best to use it? A) Add Mode32 so that you can have many apps open at once? B) Use Ramdisk to create a 60Mb s/s disk. Copy the whole contents of the 40Mb hard drive (!) into ramdisk, and run everything from there? C) Some combination of A and B? Opinions? What would make for a faster (as precieved by the user) Mac? Cheers, John -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> The FAQ: <http://macfaq.org/> --> 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/compact.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
