From: "Dan S" <[EMAIL PROTECTED]> Subject: Re: [q] Max RAM in Quadras, Im Back Date: Thu, 14 Apr 2005 14:40:52 -0500
I havent been on the quadlist for probably a couple of years now, but I
just cleaned out my closet, and now I wanna get my Quadra 950 back up and
running. One of my first questions, which Im sure has been asked many times (I
know it was a few years ago), will 32MB SIMMs work in a Quadra 950?
32MB 30pin SIMMs? Never seen any advertised. Were such things made?
Nope, no such thing. The original poster seems a bit confused on what type of SIMM socket the Q950 bears. An easy mistake to make, because all the later Quadras used 72 pin, but the Q700, Q900 and Q950 used 30 pin SIMMs in banks of four.
Thirty pin SIMMs have twelve address pins. Addressing to RAM is multiplexed in row and then column, so the total number of address bits possible is 12 X 2 = 24. Twenty-four address bits can address 16M addresses. Thirty pin SIMMs have 8 bit (one byte) wide data. So 16M addresses yields 16M X 1 byte = 16 megabyte maximum possible capacity. No larger 30 pin SIMM is possible.
Jeff Walther
-- Quadlist 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>
Quadlist info: <http://lowendmac.com/lists/quadlist.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/quadlist%40mail.maclaunch.com/>
iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
