Using the System Setup Program 4-90RXVHMouse enables or disables the system’s built-in PS/2-compatible mouse port. Dis-abling the mouse allows an expansion card to use interrupt request (IRQ) 12.6HULDO3RUWDQG6HULDO3RUWSerial Port 1 and Serial Port 2 configure the system’s built-in serial ports. Theseoptions can be set to Auto (the default) to automatically configure a port, to a particu-lar designation (COM1 or COM3 for Serial Port 1; COM2 or COM4 for Serial Port 2),or to Off to disable the port.If you set a serial port to Auto and add an expansion card containing a port configuredto the same designation, the system automatically remaps the built-in port to the nextavailable port designation that shares the same IRQ setting, as follows:á COM1 (input/output [I/O] address 3F8h), which shares IRQ4 with COM3, isremapped to COM3 (I/O address 3E8h).á Likewise, COM2 (I/O address 2F8h), which shares IRQ3 with COM4, isremapped to COM4 (I/O address 2E8h).NOTE: When two COM ports share an IRQ setting, you can use either port as neces-sary, but you may not be able to use them both at the same time. If the secondport (COM3 or COM4) is also in use, the built-in port is turned off.3DUDOOHO3RUWParallel Port configures the system’s built-in parallel port. Parallel Port can be set to378h (the default), to alternate addresses 278h or 3BCh, or to Off to disable the port.NOTE: Do not set Parallel Port to 278h if you have an Extended Capabilities Port(ECP) device connected to the port.3DUDOOHO0RGHParallel Mode controls whether the system’s built-in parallel port acts as anAT-compatible (unidirectional) or PS/2-compatible (bidirectional) port.Set Parallel Mode according to the type of peripheral device connected to the parallelport. To determine the correct mode to use, see the documentation that came withthe device.'LVNHWWHDiskette controls the operation of the system’s built-in diskette drive controller.With Auto (the default) selected, the system turns off the built-in diskette drive con-troller when necessary to accommodate a controller card installed in an expansionslot.With Write Protect selected, nothing can be written to diskette drives using thesystem’s built-in diskette drive controller. (The system can still read from the drives.)33255bk0.book Page 9 Tuesday, August 25, 1998 8:46 AM