Troubleshooting/Modifying your Serial PIC programmer

The graphical schematics shown on Anitti's page are drawn for a 9-pin serial connection. The pin-pin translation is shown below:


  9 pin      -       25 pin

    3                 2
    5                 7
    7                 4
    4                 20
    8                 5

If your programmer does not work, you may want to try some of these hints:

to reduce confusion for those of you in the western hemisphere, 4K7 is equivalent to 4.7K
From the ground pin, run a ground wire to the metal chassis of the hood.
Place a small (12 pf?) capacitor between the ground and TXD pin.
Make sure you are using a 78L05 not a 7805. The 7805 consumes the precious few millivolts/amps necessary to drive the circuit.
I think the resistor pot was placed between CTS and DTR (pins 4 & 8)

I have found these to solve some problems with "finicky" serial ports.
Good luck. Have fun.