> I have found on the net some schematics for "A serial programmer for
> PIC16C84" including software (c-language) and I tried it out!
>
> It works! With minimal costs!

You can buy ready-made cheap PIC-programmers at 31 GBP / 390 SEK / 52 USD.
Why then build it yourself? I mean, time is also valuable, especially if
you possess the valuable technical skill of being able to write PIC
software.

The above programmer can be bought here: http://www.tripnet.se/~glenn/s.htm

Regards,
Glenn