>GIF image of the schematics we are using:
>ftp://rasi.lr.ttu.ee/pub/sis/CAD/DIY/BITMAPS/com84.gif
>

I doubt that this schematic will work on my RS232 port.

I've experimented with the 78L05 regulator and have found that it
draws to much current from the port.
Therefore the programming voltage will be too low.
That's the reason why I've used a Z-diode instead.

The resistor between RTS and RB6 should be 22k (according to microchip).
But I think the 10mA that a RS232 output can suppply isn't enough to
fry a PIC ;-)

The resistor between DTR and CTS depends on the input impedance
of CTS.
I've found considerable variations on several ports.
That's the reason why I've uses 2k2.
4k7 didn't work on one of my ports !

  - Erik