"kl1k" wrote in message
...
Has anyone build David Taits PIC16C5X programmer.
(http://www.nexuscomputing.com/picarchive/upp.html)

On the schematic, whats PL3 and PL4 used for?


They are used for ISP (In System Programming) of PIC chips in a target
system.
A lead is connected from PL3 to a similar connector in the target system and
a PIC chip in the target system is programmed without having to remove it
and plug it in to the programmer.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.