Chapter 2. System-Board Features
The following connectors are available on the audio adapter or integrated audio controller:
Joystick/MIDI (Musical Instrument Digital Interface) for connecting a game control or a musical device,
such as an electronic keyboard. This feature is available on some models only.
Line Out port for connecting powered speakers. Your audio system requires a set of speakers
connected to the Line Out port in order to hear audio from the adapter. These speakers must be
powered with a built-in amplifier. In general, any powered speakers designed for use with personal
computers can be used with your audio adapter. These speakers are available with a wide range of
features and power outputs.
Headphone port for connecting Headphones. In general, any headphones designed for use with
personal computers can be used with your audio adapter.
Microphone for connecting a microphone.
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 PC 300GL has four 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 (no BIOS support for 3-mode drive)
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 36.
Serial Ports
One universal asynchronous receiver/transmitter (UART) serial port is integrated into the system board.
The serial port includes a 16-byte data, first-in first-out (FIFO) buffer, and has programmable baud rate
generators. The serial port is NS16450 and PC16550A compatible.
For information on the connector pin assignments, see “Serial Port Connector” on page 38.
Note: Current loop interface is not supported.
The following figure shows the serial port assignments in the configuration.
Figure 4 (Page 1 of 2). Serial Port Assignments
Port Assignment
Address Range (hex)
IRQ Level
Serial 1
03F8–03FF
IRQ4
Serial 2
02F8–02FF
IRQ3
10
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