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An external coin-cell battery powers the real-time clock and CMOS content. When the
computer is not plugged into a wall socket, the battery has an estimated life of three
years. When the computer is plugged in, the 3.3 V standby current from the power
supply extends the life of the battery.
Super I/O Controller
The SMC 37C672 is an ISA Plug and Play compatible multifunction I/O device that
provides the following features:
•
Two Serial Ports with high speed 16C550 compatible enhanced UARTs.
•
Multimode bidirectional parallel port
•
Floppy disk controller.
•
Keyboard and mouse controller.
•
Supports an IrDA and Consumer IR-compliant infrared interface.
By default, the I/O controller interfaces are automatically configured during boot up. The
I/O controller can also be manually configured in the Setup program.
Serial Ports
Two 9-pin D-Sub serial port connectors are located on the back panel and are
compatible with 16450 and 16550A UARTs.
Parallel Ports
The connector for the multimode bidirectional parallel port is a 25-pin D-Sub connector
located on the back panel. In the Setup program, the parallel port can be configured for
the following:
•
Compatible (standard mode).
•
Bidirectional (PS/2 compatible).
•
Extended Parallel Port (EPP).
•
Enhanced Capabilities Port (ECP).
Floppy disk Controller
In the Setup program, the floppy interface can be configured for the following floppy
drive capacities and sizes:
•
360 KB, 5.25-inch
•
1.2 MBYTES, 5.25-inch
•
720 KB, 3.5-inch
•
1.44 MBYTES, 3.5-inch
•
2.88 MBYTES, 3.5-inch