I created a USB IR transmitter using a PIC microcontroller, but the pure-assembly USB stack I used was created by a professor at a school I don't recall and had

I created a USB IR transmitter using a PIC microcontroller, but the pure-assembly USB stack I used was created by a professor at a school I don't recall and had no license agreement, so I did not open source it. I used the assembler from gputils, a PICKit for initial flashing (before all of my hardware was stolen), and there was a bootloader so most of the time flashing occurred over USB.