Traditionally, older Macs used FPM non-ECC RAM, just as they used non-parity RAM (with the mysterious exception of a small number of parity-chipped IIci Macs, and the unmysterious exception of A/UX-running Quadra 950s).

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And the Apple Network Servers, though strictly speaking those are not Macintoshes. In fact, if you put non-parity RAM in an ANS, it slows the machine down (it reduces the timing to 70ns, even if the RAM is capable of 60ns), a rare instance of parity RAM actually making a machine faster. My ANS 500 has 512MB of parity FPM, which is hard as hell to find anymore.