No Access to Port COM1

[bronan]

All of a sudden I have no access to Port COM1.
Checked in Device Manager device COM1 is enabled, no conflicts, no yellow sign- device is working properly, but when connecting my programmer to this port ( where was always connected before), receiving- "No access to COM1"
To check programmer , try it on my second OS- Win 98SE and all works O.K. on COM1.
Please advice me how I can fix this problem on XP SP3

 

[Lemon13]

check boot.ini

/NOSERIALMICE=[COMx | COMx,y,z...]
Obsolete Windows NT 4 qualifier-replaced by the absence of the /FASTDETECT switch. Disables serial mouse detection of the specified COM ports. This switch was used if you had a device other than a mouse attached to a serial port during the startup sequence. Using /NOSERIALMICE without specifying a COM port disables serial mouse detection on all COM ports. See Microsoft Knowledge Base article Q131976 for more information.

M. Knorr

MCSE, MCTS, MCSA, CCNA

 

[BadBigBen]

Did you perhaps install a MODEM, these get layed onto the COM ports, though usually as COM3...


Ben
"If it works don't fix it! If it doesn't use a sledgehammer..."
How to ask a question, when posting them to a professional forum.
Only ask questions with yes/no answers if you want "yes" or "no"

 

[bronan]

Boot.ini look like this:
[boot loader]
;timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
;timeout=30
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
;C:\="Windows 98"

@Ben,
No ,I didn't install Modem now- Modem is connected through COM4, as always in my PC.
COM Port Data Emulator can not detect COM Port1.
This COM 1 is very important to me- what can cause this problem- something wrong in the Registry, or .....
I repeat in Device Manager COM1 is listed and looks completely normal.
In Event Viewer there is no any error listed re COM1.

 

[Lemon13]

i would try

[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /noserialmice=com1

if it still wont work

compare bitrate, stopbits .... settings in xp/w98
uninstall com1 in xp and reinstall
reinstall the software that shall use com1

what changed since its not working anymore, you installed software, updates....?

use systemrestore to a date when it was still working

M. Knorr

MCSE, MCTS, MCSA, CCNA

 

[bronan]

Try to change multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /noserialmice=com1
save it , reboot , but change was rejected after reboot found previous setting.
compared bitrate and other parameters- all are O.K.

Try to Uninstall COM1, reboot but COM1 was in it's place not uninstalled.
I am going to restore one of previous image of XP using Acronis TI.

 

[Sympology]

Any changes been made in the BIOS? maybe change the settings for the serial ports to see if it makes a difference.

Most people spend their time on the "urgent" rather than on the "important."

 

[BadBigBen]

Bronan - the BOOT.INI file is WRITE PROTECTED as default, you will need to make it Read-Write, first... e.g. right-click the file and untick the box that says WRITE PROTECTED (first TAB at the bottom)...

Ben
"If it works don't fix it! If it doesn't use a sledgehammer..."
How to ask a question, when posting them to a professional forum.
Only ask questions with yes/no answers if you want "yes" or "no"

 

[bronan]

Sorted by restore one of previous image of XP using Acronis TI.
This was very long way because this TI imagine was 4 months old, but finally I fix COM1.