I had a strange issue with one of two PIC18F2550 chips today. USB was working fine with one of the chips but not with another.
The only way to make this chip work was to pull pin 26 of PIC18F2550 to +5 over a 10k-47k resistor. Weird.
dmitri wrote:This file contains 5 PIC18F2550 USB MIDI firmware versions for 4/8/12/16/20MHz crystals:
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