AMI PC BIOS versions show the amount of RAM you throw at the machine - e.g. they test RAM up to 16384KB if you start the emulation with -ramsize 16M.
Award BIOS versions make a distinction between testing
RAM and sizing
On the older "list type" Award BIOS versions, e.g. v4.20 you'd get the amount of RAM physically installed in the "testing" categories and two lines before that it'd show the amount minus
the 384K ROM area in the "sizing" categories split up between System and Extended Memory (capitalization is Award's
The later, e.g. v4.50 Awards do the count up testing on the first page, the sizing on the second one:
in MAME, we're getting 384K on top of the "physically" installed memory, 16768K, and instead the "sizing" category matches the "-ramsize" parameter.
unless, of course, you're running so025r2, a Soyo board which is in my next pull request, where the RAM test makes a rather suspicious jump from 16MB to 256MB