Chapter 2. System-Board Features
The system board has one connector for the parallel port. For information on the connector pin
assignments, see “Parallel Port Connector” on page 33.
Keyboard and Mouse Ports
The keyboard and mouse subsystem is controlled by a general purpose 8-bit microcontroller; it is
compatible with 8042AH. The controller consists of 256 bytes of data memory and 2 KB of read-only
memory (ROM).
The controller has two logical devices: one controls the keyboard and the other controls the mouse. The
keyboard has two fixed I/O addresses and a fixed IRQ line and can operate without the mouse. The
mouse cannot operate without the keyboard because, although it has a fixed IRQ line, the mouse relies on
the addresses of the keyboard for operation. For the keyboard and mouse interfaces, no resource
assignments are given in the system memory addresses or DMA channels. For information on the
resource assignments, see “Input/Output Address Map” on page 41 and Figure 48 on page 45 (for IRQ
assignments).
The system board has one connector for the keyboard port and one connector for the mouse port. For
information on the connector pin assignments, see “Keyboard and Mouse Port Connectors” on page 35.
Figure 3. Parallel Port Assignments
Port Assignment
Address Range (hex)
IRQ Level
Parallel 1
03BC–03BE
IRQ7
Parallel 2
0378–037F
IRQ5
Parallel 3
0278–027F
IRQ5
Chapter 2. System-Board Features
9
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