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Unless things have changed, NetBSD kernels can still run a.out binaries, including Linux a.out binaries.

I remember dualbooting NetBSD 1.3.1(and 1.6) and Slackware 7(and 3.x) at 386SX 33Mhz with 4MB of RAM :)

From my memories NetBSD was very fast, but 1.3.1 did not have any pkgsrc yet (so no easy software compilation).