Guru
Joined: 24/12/2017
Location: AustraliaPosts: 1636
| Posted: 04:15am 22 Mar 2021 |
You could connect a 10k resistor from pin 5 on the 1455 to +5v. That has known to be a problem. Maybe the proximity of the display when plugged in is affecting Rx to the micromite by injecting noise while the signal is initially open circuit. Jim's capacitance suggestion just woke up one of my brain cells.
Bill