For NetBSD, have a look at one of the INSTALL.* files under the architecture of your choice. E.g., for i386
INSTALL.html says
Quote:
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NetBSD 5.1.1_PATCH runs on all i486 or later PC-compatible systems with 1 to 32 processors. The minimal configuration for a full, standard installation is 32MB of RAM and 250MB of disk space.
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Note that support for actual 80386 cpu was put into mothballs some time ago, whereby it would only continue if somebody stepped up to keep it going. Seems like no-one has, not surprizingly. (The above link may become invalid at any time.)