Document Number 1000
Mouse Standard Diagnostics
4/15/92

The following diagnostics should help determine most problems you might 
encounter when installing/using Logitech mice.

In order to determine the source of the possible conflict, try booting the 
system with a DOS disk in drive A: (no AUTOEXEC.BAT or CONFIG.SYS files).  
Replace the DOS disk with the mouse driver disk (disk #1), and type the 
following command:

	MOUSE SER (for a mouse on COM1)

	MOUSE SER 2 (for a mouse on COM2)

	MOUSE BUS (for a bus mouse)

	MOUSE PS2  (for a PS/2 mouse)

If this solves the problem, then there is either:

1) A conflict with something being loaded in the AUTOEXEC.BAT or CONFIG.SYS
   file. To determine actual conflicting software, add back the contents of
   the AUTOEXEC.BAT and CONFIG.SYS files one line at a time until it fails.
   Sometimes loading these utilities in a different order is all that is
   required to solve the conflict. In general, we recommend loading the 
   mouse driver before any other resident software.

-OR-

2) There is another mouse on the system (or, at least, the mouse driver 
   thinks so!). For example, some video cards have built-in bus mouse ports.
   If you were to try to use a serial mouse on a system with one of these 
   video cards, it would be necessary to force-route the driver to the serial
   port by using MOUSE SER to load the driver.

If the problem persists, make sure there are no other devices on the 
system using the same interrupt (IRQ) or I/O address as the mouse.  The 
proper settings are as follows:

	COM1:
	IRQ 4
	Address 3F8
	COM2:
	IRQ 3
	Address 2F8

	BUS:
	IRQ (see JMP1 on BUS card)
	Address 23C-23F

NOTE: COM3 and COM4 usually use IRQ's 4 and 3 respectively. Since mice cannot
share IRQ's, a system should not be configured with a mouse on COM1 and 
another device on COM3 (or a mouse on COM2 and another device on COM4).
If you are unsure of the IRQ used by a particular device, it should be 
temporarily removed to see if it has any effect on the problem.

If the symptoms continue, try the mouse on another system to verify that the
mouse is working properly.