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Chapter 4 BIOS Setup
LittleBoard 550 Reference Manual 73
• IRQ – [none], [1], [3], [4], [5], [6], [7], [9], [10], [11], [12], [14], or [15]
This field specifies the IRQ used for Serial Port 1. If this field is set to [none], then no
IRQ is assigned, making it available for other devices.
• Mode – [RS-232] or [RS-485]
This field specifies the signal mode, RS232, or RS485, used for Serial Port 1. If [RS-485]
mode is selected, the RTS signal should be used to control the direction for this port
(transmit or receive).
♦ Serial 2 – [Disabled], [3F8h], [2F8h], [3E8h], [2E8h], [260h], [2F0h], [3E0h], [2E0h],
[200h], or [220h]
This field specifies the base address used for Serial Port 2.
• IRQ – [none], [1], [3], [4], [5], [6], [7], [9], [10], [11], [12], [14], or [15]
This field specifies the IRQ used for Serial Port 2. If this field is set to [none], then no
IRQ is assigned, making it available for other devices.
• Mode – [RS-232] or [RS-485]
This field specifies the signal mode, RS232, or RS485, used for Serial Port 2. If [RS-485]
mode is selected, the RTS signal should be used to control the direction for this port
(transmit or receive).
♦ Serial 3 – [Disabled], [3F8h], [2F8h], [3E8h], [2E8h], [260h], [2F0h], [3E0h], [2E0h],
[200h], or [220h]
This field specifies the base address used for Serial Port 3.
• IRQ – [3], [4], [5], [7], [9], [10], or [11]
This field specifies the IRQ used for Serial Port 3. If this field is set to [none], then no
IRQ is assigned, making it available for other devices.
• Mode – [RS-232] or [RS-485]
This field specifies the signal mode, RS232, or RS485, used for Serial Port 3. If [RS-485]
mode is selected, the RTS signal should be used to control the direction for this port
(transmit or receive).
♦ Serial 4 – [Disabled], [3F8h], [2F8h], [3E8h], [2E8h], [260h], [2F0h], [3E0h], [2E0h],
[200h], or [220h]
This field specifies the base address used for Serial Port 4.
• IRQ – [3], [4], [5], [7], [9], [10], or [11]
This field specifies the IRQ used for Serial Port 4. If this field is set to [none], then no
IRQ is assigned, making it available for other devices.
• Mode – [RS-232] or [RS-485]
This field specifies the signal mode, RS232, or RS485, used for Serial Port 4. If [RS-485]
mode is selected, the RTS signal should be used to control the direction for this port
(transmit or receive).
• On-Board LPT Port
♦ LPT 1 – [Disabled], [378h], [278h], [3BCh], [370h], or [270h]
This field specifies the base address used for the parallel port (LPT 1).
• IRQ – [none], [1], [3], [4], [5], [6], [7], [9], [10], [11], [12], [14], or [15]
This field specifies the IRQ used for the parallel port (LPT 1). If this field is set to [none],
then no IRQ is assigned, making it available for other devices.