Different motherboards use different chipsets. They are not all equal. A good USB programmer can be had for less than $50 US.

Originally Posted by irish

No need to tell me about JDM programmers, i completely understand they are bad, unreliable etc etc. Didn't know that WinPic doesn't like serial ports, thanks for telling me that.

Not WinPic - WinPicProg - the original Windows PIC programming software.

His computer is not much newer/older than mine and both of us have COM ports on our motherboards. And if there are COM ports on motherboards then they were put there by the manufacturers with the purpose of working so it should work.

No - they are put there to work with RS232, NOT to work with a badly designed PIC programmer.

Originally Posted by irish

uJDM Simple PIC programmer
I used this scheme ............

Instead you may use one attached below, a design by DL4YHF
However JDMs are are poor in design. For long term use, the best is to go for USB based PICKIT2 or a clone with added facilities like tutor for one of the PIC chips. slowly the com ports and LPT ports disappear as laptops takeover desktop PCs.

@ Irish one more modification in your uJDM.

This method works but it is very risky.

You just apply 5V to PICs VDD & VSS in your uJDM programmer.