I see in DigiKey the 16C64 has 33 I/O lines.  Can you use all of these
lines for general I/O?  The 68hc11 claims it has 30+ I/O lines too, but in
reality 8 lines are dedicated for A/D, 2 lines dedicated to SPI, 3 or 4
dedicated input compares, 5 or 4 dedicated output compares, etc.

Thanks,
Jeff Fisher