According to the Apple Memory Guide January 2001, all desktop Macs numerically before the 4400 (Tanzania) used only FPM RAM, in 30-pin (or 72-pin) SIMMs, as tomlee59 observed. The use of EDO RAM (1k or 2k refresh rate) coincided with use of the 603e processor. All Compact AIOs therefore use 30-pin FPM SIMMs, at blazing speeds from 150ns to 100ns. The capacities of the usable SIMMs usually rise fourfold in a given Mac (ie, 256kB, 1MB, 4MB, 16MB), although both extremities of the range are not usually found in any but the IIcx, IIci (which can even use 512kB DIMMs) and IIvx, and a very few Macs (eg, Classic II) can use 2MB SIMMs. Apple seems never to have planned for use of 8MB in 30-pin SIMMs.

Chipmunk remains a useful listing, but, especially in the oldest RAM, has many frustrating holes in its listings.

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