Hang on Memtest86 Test 4, What Next?

I'm diagnosing an unreliable Asus Aspire MT-1300 with an AMD-233. It
consistently freezes/hangs at some point during the first run of
Memtest86's Test 4 ("Moving inv, 32 bit pat, cached"), even when using
different pieces of RAM. I've removed everything else from the system,
so the problem must be with either the CPU or the motherboard. What
I'd like to know is whether there is any way I can figure out which
component has the problem in the absence of any compatible hardware to
test them separately?

I can't get Windows or Linux to run for long enough to reliably
execute diagnostics but DOS seems to do okay (not surprising consider
640k is enough for everyone). And yes, I know this hardware is
obsolete enough that I should just junk the whole thing, but entertain
me here.

~ Jared Warren