Lenovo PC 300PL Technical Information Manual 6275, 6285 - Page 22

Input/Output Controller, Diskette Drive Interface, Serial Ports

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Chapter 2. System-Board Features Input/Output Controller Control of the integrated input/output (I/O) and diskette drive controllers is provided by a single module, the SMC 37C673. This module, which supports Plug and Play, controls the following features: Diskette drive interface Serial port Parallel port Keyboard and mouse ports General purpose I/O ports Diskette Drive Interface The actual number of diskette drives that can be installed is dependent upon the system unit size (the PC 300 Types 6275/6862 have four drive bays for installing internal devices and the PC 300 Types 6285/6892 have six drive bays for installing internal devices). The following is a list of devices that the diskette drive subsystem supports: 1.44 MB, 3.5 inch diskette drive 1.44 MB, 3.5 inch, 3-mode drive for Japan 1.2 MB, 5.25 inch diskette drive 1 Mbps, 500 Kbps, or 250 Kbps internal tape drive One connector is provided on the system board for diskette drive support. For information on the connector pin assignments, see "Diskette Drive Connector" on page 58. Serial Ports Integrated into the system board are two universal asynchronous receiver/transmitter (UART) serial ports. The serial ports include a 16-byte data, first-in first-out (FIFO) buffer, and have programmable baud rate generators. The serial ports are NS16450 and PC16550A compatible. For information on the connector pin assignments, see "Serial Port Connectors" on page 61. Note: Current loop interface is not supported. The following figure shows the serial port assignments used in configuration. Figure 2. Serial Port Assignments Port Assignment Serial 1 Serial 2 Serial 3 Serial 4 Address Range (hex) 03F8-03FF 02F8-02FF 03E8-03FF 02E8-02FF IRQ Level IRQ4 IRQ3 IRQ4 IRQ3 The default setting for serial port is COM1. 10 Technical Information Manual

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Chapter 2.
System-Board Features
Input/Output Controller
Control of the integrated input/output (I/O) and diskette drive controllers is provided by a single module,
the SMC 37C673.
This module, which supports Plug and Play, controls the following features:
Diskette drive interface
Serial port
Parallel port
Keyboard and mouse ports
General purpose I/O ports
Diskette Drive Interface
The actual number of diskette drives that can be installed is dependent upon the system unit size (the PC
300 Types 6275/6862 have four drive bays for installing internal devices and the PC 300 Types 6285/6892
have six drive bays for installing internal devices).
The following is a list of devices that the diskette drive
subsystem supports:
1.44 MB, 3.5 inch diskette drive
1.44 MB, 3.5 inch, 3-mode drive for Japan
1.2 MB, 5.25 inch diskette drive
1 Mbps, 500 Kbps, or 250 Kbps internal tape drive
One connector is provided on the system board for diskette drive support.
For information on the
connector pin assignments, see “Diskette Drive Connector” on page
58.
Serial Ports
Integrated into the system board are two universal asynchronous receiver/transmitter (UART) serial ports.
The serial ports include a 16-byte data, first-in first-out (FIFO) buffer, and have programmable baud rate
generators.
The serial ports are NS16450 and PC16550A compatible.
For information on the connector pin assignments, see “Serial Port Connectors” on page
61.
Note:
Current loop interface is not supported.
The following figure shows the serial port assignments used in configuration.
The default setting for serial port is COM1.
Figure 2. Serial Port Assignments
Port Assignment
Address Range (hex)
IRQ Level
Serial 1
03F8–03FF
IRQ4
Serial 2
02F8–02FF
IRQ3
Serial 3
03E8–03FF
IRQ4
Serial 4
02E8–02FF
IRQ3
10
Technical Information Manual