>Also, what is the best alternative (pricewise) to a '84 once development
>is complete (i.e. not needing the EEPROM)?

        Look at the 16C556.  About US$1 cheaper, but has 80 bytes
        of RAM and runs up to 20 MHz.  (narrower voltage range
        though: 2.5-5.5 volts)

        If you only need 512 bytes ROM, then you can also use the
        16C554, and save another quarter.

___Bob