Hi gang,
I need all 8 I/O pins of the C84 as outputs.  I think I can use the
serial input for a control port without having to set up a real serial
transmitter to it.  By a 300 baud clock and a monostable that would
duplicate a serial (0) or serial (255).

Your advice and/or  comments are greatly appreciated.

Best fun,
Duane.