The PIC Microcontroller on Antminer Hashboards: What It Does, How It Fails, and Why the S21 Has None
D-Central
The PIC on Antminer Hashboards: Failures & Recovery | D-Central
What the PIC16F1704 does on S19 hashboards, the 3.3V pin-2 health check, PICkit3 reprogramming, and why S21-generation boards have no PIC at all.