Date: Wed, 23 Feb 2005 13:31:09 +0100 (CET) From: Gheorghe Ardelean <[EMAIL PROTECTED]> On Wed, 23 Feb 2005, Jason Greshes wrote:
The Q950 needs 30 pin SIMM's used to be used also in old PC (286/386/486). Today you can find the 4MB and 1MB ones on ebay (as an example). They are not expensive at all. With 1MB modules you get 16MB total, with 4MB modules you get 64MB.
One can also use the 8MB and 16MB modules (the biggest 30 pin SIMM that I know of) and you get a total of 128/256MB RAM.
16 MB is the largest 30 pin SIMM possible. The 30 pin SIMM has twelve address lines. Addressing to RAM is multiplexed into row and column addresses, so the total address bits is 2 X twelve = 24 bits. Twenty-four bits will address 16 million addresses. There is one byte of memory per address on a 30 pin SIMM (four bytes per address on a 72 pin SIMM, and 8 bytes per address on a 168 pin DIMM) so you get 16 million addresses X 1 byte/address = 16 million bytes maximum or 16 MB.
The last time I checked, sets of four 16 MB 30 pin SIMMs were being sold on Ebay for about $25. That was a couple of months ago.
A couple of years ago, a user with the handle Sunyuk or sunguk or something similar to that was selling sets of four 16 MB SIMMs for about $15 per set. His Item Description said they were salvaged from Quadra 700s and were low profile. I haven't seen him around in a while though. His sales were fixed price sales with 100s of sets listed as available, so I thought he would be around until I was ready to buy. Sigh.
Jeff Walther
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