HOWEVER -- the program would not compile because there is an undeclared
    variable, by the name of RTCC.  It appears to me that RTCC and TMR0 are the
    same, and so this is not a big thing.  Except that I am curious as to why
    they called it RTCC.  Is this a historical thing?  Did TMR0 used to be
    called RTCC?  The data sheet for the 16C54 makes no mention of RTCC.

Yes, it's historical.  My 1992 databook mentions only RTCC and no TMR0.  Now
I'm sorta wishing I'd saved my 1984 databook as well, although it looks like
not much happened between 84 and 92.  I guess they didn't change the names
till they introduced a PIC with more than one timer...

BillW

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