> Has anyone much success in using a '84 as an I2C slave. I know
> other PIC micros have hardware to support I2C, but I'd like to
> stick with the '84.
>
> A pointer to any '84 i2c slave source would be great.

You will need to add external hardware if you want to support I2C; you will
also need to ensure that there is at least one licensed I2C component in the
system.  How much hardware is needed will depend upon many factors, but the
primary consideration is that unless you add hardware support there is no way
a PIC can keep up with a master that's running at full speed and be able to
do anything else practical.