This page is about the PIC18F4550, a microprocessor with USB support. I used the guides at http://pic18fusb.online.fr/wiki/wikka.php?wakka=WikiHome to get started. I first made a testboard using the Minimal Schematic from the Wiki, but I added a led to get some feedback from the board. I then wrote a testcode to make the led blink and confirm that the board worked. I use a DIY149 programmer (http://www.kitsrus.com) to program Pic's, and with a new firmware and a PC-software called Donkeyprog (http://www.stu.info.btinternet.co.uk) I can program the 4550. Here is the testboard: The code to blink the led can be found below (ledblink1.asm). Note that the code is not beautiful and optimized.