Q44126: Finding the COM1: Serial Port on a PC/XT/AT Machine
Article: Q44126 Product(s): See article Version(s): 1.00 | 1.00 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | | mspl13_basic Last Modified: 31-AUG-1989 When connecting the Microsoft Mouse serial interface cable to your computer, you must first determine the location of the serial port. On a PC- or XT-class computer, the serial port is normally the male, 25-pin, D-shaped connection in the back of the machine. On an AT-class computer, the serial connection is normally the male, 9-pin, D-shaped connection on the back of the computer. There are exceptions, but these descriptions are a good rule of thumb. Note: If the machine has only one serial port, it should be set up as COM1: using IRQ4. If the serial port is set up as COM2: and it is the only serial port in the machine, the Microsoft Mouse driver might install, but the mouse might not function properly. COM3: and COM4: is not supported by the mouse driver.
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