pmdl> So the programmer would probably consist of a UART, a MAX232, and a
 pmdl> programmed
 pmdl> 16C84. A DB9 or 10 pin dual header would connect the target to the

No need for this.
You can program a 16C84 with a Max232 and two inverters.
Even only with a Max232, but this is triky.
This works with every RS232, not just with PC-Ports.

I've used this on my machine independant Pic programmer.
After programming, the 16C84 takes controll over the serial communication
and can program other PIC's, EEPROM, Flash, etc.


Gruss
    Erik

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