🚀 go-pugleaf

I've just upgraded to a Micronics 486/33 ISA.  It works great, though I
have a couple of questions.  Does anyone know
what switch 1-6 does?  The documentation seems to say that it selects
the bus speed (between 8Mhz and 11Mhz?).  Is this correct?
     How about switch 1-7?  What does it mean for the video-bios to be
cacheable?  I don't think this switch controls relocation of the video
roms to ram because there's already an option to control that in the
the SETUP (ctrl-alt-esc) screen.
     My external cache chips have the following numbers: 5C6408-15.  I know
these are 15ns chips, but what size are they? 8Kx8? 32Kx8?  The manufacturer's
symbol says MT.  I don't recognize it.
     Does anyone know where the reserved memory lies?  On my old Micronics
386-16, it used to sit just below the 16Mb boundary, where QEMM could reclaim
it (QEMM calls this top memory, incidentally).  Since my 486 has 16Mb, I doubt 
the reserved memory is located there anymore.  Where is it now?  Note: I really
don't care that much if I can reclaim it.  I certainly have more than enough
memory.  I'm just curious about its whereabouts.

Thanks.