Hi Mike (Mike Keitz), in <19970912.121923.5150.14.mkeitz@juno.com> on Sep 12 you
 wrote:

> So I went to making the clock frequency variable.  I didn't try the RC
> oscillator; it may work at 12 MHz but I doubt it.

The C part does work at 12 MHz RC, although the data sheet says 4 MHz is
the limit (for RC, it was a -10 part).  However, the frequency is _very_
"variable" as the C must be very small (near the capacity of the copper
traces).  I watched a continous square output on the oscilloscope while
touching the traces.  Wheee, factor 10-100!!  Not exactly a reference for
VGA signals!