John Mullan <PICLIST@MITVMA.MIT.EDU> wrote:

> I have built and successfully used the programming device for
> connection to a PC COM port.  This is for 16C84.
>
> Fellow PICLIST people have told me that there is an
> incompatibility using this circuit on the PIC16C54.
>
> Can anyone out there tell/show me the modifications necessary to
> make this work for 16C54s.

John:

The 16C5x programming method is COMPLETELY different from the
16C84/F84 method... A 16C5x programmer needs access to all 12 I/O
lines, it needs to accurately time the programming pulses it
sends to the PIC, and it may need more Vpp current than your serial
port can provide.

Sorry, but you can't just "modify" your C84 programmer to do
16C5x's... If yo want to build a '5x programmer, start by reading
the 16C5x Programming Specifications in the Microchip PIC16/17
Microcontroller Data Book.

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499