AVRISP is very popular Parallel port programmer for flashing AVR type microcontrollers. Earlier I used programmer connected to com port, but frequently I needed this port for other purposes, I decided to make it work on parallel port. The programmer on parallel port is much simpler than connected to serial port, because there is no needed voltage adapter like MAX232. You can only connect your MCU directly to port. But for safety reasons there is good practice to use buffer ship like 74HC244.
The header for programmer I used standard 6 pin ISP header.
I wanted to make compact programmer, so I put circuit inside LPT head. Few pictures of it:
Programming is usually done by using PonyProg software. Bellow is its configuration: