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Forum Index : Microcontroller and PC projects : Lost Com Ports

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Octatron
Newbie

Joined: 01/04/2015
Location: United Kingdom
Posts: 29
Posted: 03:37pm 05 Aug 2026
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I have been programming Micromites and Picomites on my Win10 laptop for years and was doing so last week with no problems. This week it won't connect. For instance using Tera Term I can't select the serial ports and no Coms ports show up! I suspect Microsoft has snook in an update. I might add that the USB ports do work if I plug in a keyboard for instance. I'm a bit puzzled, any ideas?
I also have a Linux laptop and looked into running MMedit on it but it looks complicated and at my limits with Linux.
 
PhenixRising
Guru

Joined: 07/11/2023
Location: United Kingdom
Posts: 2041
Posted: 04:09pm 05 Aug 2026
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This happened to me (ages ago) with only the PicoMite. Tried lots of stuff to no avail except for the easiest thing (typical of me  ) which was to connect to a different USB hub port. Everything came to life and I could even revert back to the original port.
 
Octatron
Newbie

Joined: 01/04/2015
Location: United Kingdom
Posts: 29
Posted: 05:46pm 05 Aug 2026
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I tried different USB Ports but to no avail.
 
EDNEDN
Guru

Joined: 18/02/2023
Location: United States
Posts: 304
Posted: 06:48pm 05 Aug 2026
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Sometimes the USB ports get confused on Windows machines and get turned off.

A hard power cycle is worth trying if you haven't done that yet.
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 6013
Posted: 07:36pm 05 Aug 2026
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  Octatron said  I have been programming Micromites and Picomites on my Win10 laptop for years and was doing so last week with no problems. This week it won't connect. For instance using Tera Term I can't select the serial ports and no Coms ports show up! I suspect Microsoft has snook in an update. I might add that the USB ports do work if I plug in a keyboard for instance. I'm a bit puzzled, any ideas?
I also have a Linux laptop and looked into running MMedit on it but it looks complicated and at my limits with Linux.


Try powering off the PC (and its built in root hub).
It happened to me after too many re-connects of the same device.
Bug in the usb hub firmware.

Volhout
PicomiteVGA PETSCII ROBOTS
 
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