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General Mach Discussion / Re: Motor changing direction at random
« on: January 09, 2021, 01:38:09 AM »
Check that your PC parallel port outputs are 5 Volt TTL logic and not 3.3 Volt TTL. This thread may be helpful; https://www.machsupport.com/forum/index.php?topic=34848.0
Tweakie.
Tweakie.