I have recently been working on a project that requires me to return to Microchips Pic Assembly Suite. Having worked mostly on Pic C18 for a while, it was a little difficult to program in assembly again. After a couple minutes of research on the web, I found an awesome resource for Pic hardware and assembly.
Gooligum Electronics has very detailed information on various ranges of hardware complexity and accompanying assembly code to help use the hardware as well. This link will also be included in the useful links box on the right.
