Tried the latest (1.2.25) Mission Planner on XP 32 -bit, made sure the atmega2560.inf driver was installed (Device Manager says it is there), fired up MP and tried to connect. It shows "(COM5) Atmega2560" in the MP connect area - had the baud rate at115200 (or whatever is normal) - but it says Connect Failed - Com5 doesn't exist. Tried rebooting XP, unplugging the APM2.5 (works just fine on Windows 7).
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Criterion-Industries,
Thanks much for your expertise!
Dave