One more HardMPU. 😀 It's a pity, but it doesn't work well. Deep in debug. HardMPU utility is waiting for DRR. /DRR is 4.4V (not 5V) and it seems that U6 sends DB6 as logical 1. Filename IMG_20200726_041039_sm.jpg File size 193.82 KiB Views 2153 views Filename IMG_20200726_041052_sm.jpg File size …