問題：電腦Com PORT連接GPS對時信號，電腦上有一個程式，從Com口讀取GPS時間信號，然後設置電腦本地時間;但問題是程式打開Com口一直失敗，報Com已經被佔用， 不能再次打開Com，奇怪Com怎麼會被佔用呢？
問題原因：原來Com連接的GPS設備，因為滿足了微軟對Serial ballpoint設備的檢測要求，被微軟誤認為Com連接的是Serial ballpoint設備，作業系統佔用了Com導致問題。
解決辦法1：
在設置管理器-滑鼠及其他指標裝置：禁用:Microsoft Serial BallPoint，這樣就防止Com連接的設備誤檢測為Microsoft Serial BallPoint設備
解決方法2：（來至於網上，未測試）
I had the same problem, cursor sometimes jumps all over the screen
Here's the fix: Open Regedit. Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SerMouse, and change the value "Start" from 3 to 4. Reboot.
I found this on a website for a program to help with gps . Worked like a charm for me.
There is a reg file that will do the editing for you also. http://www.curioustech.net/downloads/reg.zip 註冊表
解決方法3：（來至於網上，未測試）
running the command "DEVCON.exe DISABLE *PNP0F09"
It seems to work on W7 as well. You may try this solution by getting hold of DEVCON.EXE: It is included in the Windows DDK (Driver Development Kit 7.1). Or you may download it from here, I believe: http://support.microsoft.com/kb/311272
EDIT: Seems like it works, but it has to be done for each separate USB port you will be using. I am working on trying to find a solution to this...
參考網頁：
http://www.biosren.com/viewthread.php?tid=1004
http://www.gpsoz.com.au/jumping_mouse.htm
http://answers.microsoft.com/en-us/windows/forum/w...
另：串口印表機的驅動佔用Com1，其它程式繼續使用Com1，將導致錯誤。
參考網頁：
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