Windows 10: Windows 10 Slow Serial/COM Ports?

I have a custom program that writes to a device on COM1. On Windows XP, it runs super fast but once I got it onto Windows 10, it works, but is super slow. It usually runs on the motherboard's Serial port, but I've also tried a USB to serial adapter with the same results. One time, it was working great, but since a reboot, it is back to writing slowly. The trick that made it work temporarily was to run the program in Compatibility Mode (XP SP2) but like I said, the reboot broke it again.

Yes, I know that since this is a custom program, the large amount of reasons for the problem can be quite extensive, but it seems to work, just very slowly. Any suggestions would be welcome.

submitted by /u/PoniardBlade
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:)

 

Windows 10 serial on OEM


So I'll summarize steps made...

1. Saved serial number (taken with Belarc Advisory) from preinstalled (half chinese language) Windows 8.1 (don't know exactly the version, suspect Windows 8.1 with bing) on tablet
2. Formatted tablet
3. Tried to make a clean Windows 10 (HOME, HOME N and also PRO, everytime with the same result) install with ISO taken with MediaCreationTool, during install (and also after completing installation) it says that the saved serial is not valid
4. Tried to reinstall Windows 8.1 (ISO taken with MediaCreationTool again) HOME, it says that the serial is not valid

So i suspect that the saved serial, is from a WINDOWS 8.1 WITH BING OEM version and this kind of ISO is not accessible/downloadable anywhere (at least I can't find it, any suggestion?)

Still not tried SHOWKEY with that serial, I am in office now, and the serial is saved on a usb pen at home, will try this evening.

So I'm stucked but if everything is like I suspect, it's incredible. If I have a tablet/notebook/netbook with Windows 8 preinstalled, it seems that I can update to Windows 10 without problems, but if I want to make a clean Windows 10 install that serial is not valid...

 

Changing the Port settings for Serial-USB.

Hi,



Thank you for writing to Microsoft Community Forums.

If you want to change the port settings, please follow the steps mentioned below:

1. Open Device manager (right click on start button
   and then on Device manager).
   
2. Then expand port (COMS & LPT).
   
3. Then right click on Prolific USB-to Serial Comm Port and then on properties.
   
4. Go to port settings and click on Advanced.
   
5. You will be able to make the changes on this screen.
   

Hope this helps.

 

Hyper-V serial port

Hi

We have

Hyper-V Manager version: 10.0.18362.1

installed on Windows 10. We need to use serial port on victual machine, but could not get correct configuration. We tried some suggestions from internet, such as remote logon the virtual machine and use the serial port on host computer. It does not work neither.
What is the best way to get serial port on Hyper-V virtual machine?