In message: <20020322234311.A343@mt.sri.com>
            Chris Jones <chris@cjones.org> writes:
: Interestingly enough, I cannot find a Vrc4172 in my MP 800.  Could it
: be a different chip?  On the CPU daughterboard which has the Vr4121
: (or D30121F1), there's another chip which is labelled "D82310S 1003
: 9915KU250".  I think a Vrc4172 would be labelled D31172.

My Vcr chips are labeled NEC Vcr4172 or Vcr4171 or Vcr4371 (in my Thin
Star).  The D82310S chip likely is ROM part (at least 82 chips I've seen
before are ROMs).

: Where can I find an explanation of these labels?  Google didn't help.

I don't think you can.  I've only found them by direct examination and
luck.

Warner