SOYO SY-7IS2 user manual I/O Interface Controller, Real-Time Clock, Serial Ports, Parallel Port

Motherboard Description SY-7IS2

1-6.8 Real-Time Clock

The real-time clock supports 256 bytes of battery-backed CMOS SRAM.

Hardware implementation to indicate century rollover.

1-7 I/O INTERFACE CONTROLLER

The motherboard uses the ITE IT8712F-A I/O controller which features:

lSingle diskette drive interface

lTwo serial ports

lFIFO supports on both serial and diskette interfaces

lOne parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support

lPS/2 style mouse and keyboard interfaces

lPCI PME interface

lIntelligent auto power management, including:

ØShadowed write-only registers for ACPI compliance

ØProgrammable wake-up event interface

The Setup program provides configuration option for the I/O controller.

1-7.1 Serial Ports

The motherboard has two 9-pin D-Sub serial port connector located on the back panel. The NS16C5450-compatible UARTs support data transfers at speeds up to 115.2 Kbits/sec with BIOS support.

1-7.2 Parallel Port

The connector for the multimode bi-directional parallel port is a 25-pin D- Sub connector located on the back panel of the motherboard. In the Setup program, there are four options for parallel port operation:

lCompatible (standard mode)

lBi-directional (PS/2 compatible)

lBi-directional EPP. A driver from the peripheral manufacturer is required for operation. See Section 6.2 for EPP compatibility.

lBi-directional high-speed ECP

1-7.3 Diskette Drive Controller

The I/O controller is software compatible with the 82077 diskette drive controller and supports both PC-AT and PS/2 modes. In the Setup

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