Q59861: 400 DPI Serial Mouse and Northgate Computers
Article: Q59861 Product(s): See article Version(s): 1.00 Operating System(s): MS-DOS Keyword(s): ENDUSER | | mspl13_basic Last Modified: 2-MAY-1990 When the 400 PPI PS/2/Serial Mouse is installed on the 9-pin serial port of some Northgate Computer, the mouse may not install. When the 400 PPI PS/2/Serial Mouse is installed on the 9-pin serial port as a serial mouse, it uses pins 2, 3, 4, 5, and 7 to communicate with the serial port. The other pins in the 9-pin connector are used when the PS/2 adapter is connected to the mouse. Pin 8 of the built-in serial port, when set to a logic zero, is 1 to 2 volts higher than the voltage that would be present on an IBM compatible serial port. When a logic 1 is present on pin 8 and the mouse is connected to a 9-pin serial port, the mouse cannot reset. This prevents the mouse from installing. To work around this problem, do either of the following: 1. Contact Northgate Technical Services at (800) 445-5037. They have found the cause of the problem and will work with you to make the necessary corrections to the motherboard. 2. Use a 9- to 25-pin serial adapter to eliminate the signal from pin 8. To do this, you need to purchase the adapter from a local electronics store. This adapter has a 9-pin female connector on one end and a 25-pin male connector on the other end. Once you have the adapter perform the following steps: a. Attach the adapter you purchased to the built-in serial port of your computer. b. Attach the mouse to the 25- to 9-pin serial adapter that was supplied with your mouse. c. Attach this adapter to the 9- to 25-pin adapter that you have already attached to your computer.
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