PICALL Programmer v3.1 ICSP Adapter for Microchip PICs
PICALL 3.1 with homebrew ISCP adapter.

  This is an in-circuit serial programming adapter to facilitate programming the Microchip(R) PIC brand microcontrollers via the PICALL v3.1 hardware.

  * CAUTION * Improper usage of this adapter may damage the PICALL or your target circuit. Recommended for advanced users only. I have not tested this with all PICs, no warranty, etc.

  An ICSP adapter allows a PIC to be programmed without being removed from it's circuit. This design allows the PICALL programmer v3.1 to program most PICs in-circuit with a good margin of safety. It may work with other previous hardware versions without the dedicated ICSP port, but this is totally untested. Feedback would be helpful.

Here's what you need:

  I simply soldered the components to the DIP socket. The cable can be wired however you like, and might benfit from some kind of keying or polarity protection. An alternative adapter idea might be to make a small PCB the size of the DIP40 and replace the socket with that. Then SMT components could be used, further reducing the size.

Note D3 is missing from this prototype.
Here is a photo of a complete adapter.

The ribbon wires were stripped with a razor blade.
Close-up. D3 is not installed on this prototype yet.

  Hot-melt glue is used to secure the ribbon cable to the socket and to provide strength in the plug connection.

3M brand hot-melt glue is great stuff!
And the plug detail.

  The wiring schematic is as follows:


  Have fun!

  Mark Jones
  Helios Studios