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The new Mac family of computers use PC-100 compliant 168-pin SDRAM DIMMs. The mechanical characteristics of the DIMM are given in the JEDEC specification for the 168-pin 8-byte DRAM DIMM. The specification number is JEDEC MO-161; the specification is available from the Electronics Industry Association's web site, at
http://www.jedec.org/download/freestd/pub95/mo161C.pdf
The electrical characteristics of the DIMM are given in section 4.5.6 of the JEDEC Standard 21-C, release 7. The specification is available from the Electronics Industry Association's web site, at
http://www.jedec.org/download/freestd/pub21/
The RAM DIMMs are required to be the PC-100 compliant. The PC-100 specification is available from Intel's web site, at
http://developer.intel.com/design/chipsets/memory/sdram.htm#S1