Motherboard Description
1.8 PC87307 Super I/O Controller
Control for the integrated serial ports, parallel port, floppy drive,
∙Two
⎯Support for an IrDA and Consumer IR compliant Infrared interface
∙
⎯Standard mode; IBM† and Centronics† compatible
⎯Enhanced Parallel Port (EPP) with BIOS/Driver support
⎯High Speed mode; Extended Capabilities Port (ECP) compatible
∙Industry standard floppy controller with 16 byte data FIFO (2.88 MB floppy support)
∙Integrated Real Time Clock with Century calendar functionality
∙Integrated 8042 compatible keyboard controller
The PC87307 is normally configured automatically by the BIOS, but configuration of these interfaces also is possible using the CMOS Setup utility that can be invoked during boot. The serial ports can be enabled as COM1, COM2, COM2 as IrDA, or disabled. The parallel port can be configured as compatible,
1.8.1Floppy Controller
The PC87307 is software compatible with the DP8473 and 82077 floppy disk controllers. The floppy interface can be configured for 360 KB or 1.2 MB 5¼" media or for 720 KB, 1.2 MB,
1.44MB, or 2.88 MB 3½" media in the BIOS setup. By default, the Floppy A interface is configured for 1.44 MB and Floppy B is disabled. Configuring the floppy interface for 1.2 MB 3½"
1.8.2Keyboard and Mouse Interface
PS/2 keyboard/mouse connectors are located on the back panel side of the motherboard. The 5V lines to these connectors are protected with a PolySwitch† circuit which acts much like a self- healing fuse,
The integrated 8042 microcontroller contains the AMI Megakey keyboard/mouse controller code which, besides providing traditional keyboard and mouse control functions, supports Power- On/Reset (POR) password protection. The POR password can be defined by the user in the Setup program. The keyboard controller also provides for the following
∙<CTRL> <ALT> <DEL>: System software reset. This sequence performs a software reset of the computer by jumping to the beginning of the BIOS code and running the POST operation.
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