Справочник Пользователя для PC Concepts SHG2 DP

The National* PC87417VLA is integrated on the SHG2 baseboard as the Super I/O controller 
(SIO). The SIO is a Plug and Play-compatible device with ACPI-compliant controller/extender. 

 

The SIO provides support for the following features: 

• 

The system real-time clock (RTC) 

• 

Two serial ports 

• 

One parallel port 

• 

Floppy disk controller 

• 

PS/2-compatible keyboard and mouse controller 

• 

Gereral purpose I/O (GPIO) pins 

• 

Plug and Play functions 

• 

Power management controller 

The SHG2 baseboard provides the connector interface for the floppy, dual serial ports, parallel 
port, PS/2 mouse, and the PS/2 keyboard.  See Section 8 (Connections) for connector pinout 
information.  Upon reset, the SIO reads the values on GPO pins to determine its boot-up 
address configuration.  

One 9-pin connector in a D-Sub housing is provided for serial port A, while serial port B is 
optional via cable to the rear of the chassis through a 9-pin connector.

Both ports are 

compatible with 16450 and 16550A modes, and both are re-locatable.

Each serial port can be 

set to one of four different COM-x ports, and each can be enabled separately.

When enabled, 

each port can be programmed to generate edge- or level-sensitive interrupts. 

When disabled, 

serial port interrupts are available to add-in cards.  The serial port pinout is shown in Table 3. 

1 

DCD 

Data Carrier Detected 

2 RXD 

Receive 

Data 

3 TXD 

Transmit 

Data 

4 

DTR 

Data Terminal Ready 

5 GND 

Ground 

6 

DSR 

Data Set Ready 

7 

RTS 

Request to Send 

8 

CTS 

Clear to Send 

9 

RIA 

Ring Indication Active