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Chapter 4 BIOS Setup
74 Reference Manual LittleBoard 550
• DMA – [3], [2], [1], or [0]
This field specifies the DMA channel used for the parallel port (LPT 1). If the LPT 1
field is set to [Disabled], then no DMA channel is assigned, making it available for other
devices.
• Mode – [Standard], [SPP (bi-dir)], [EPP 1.9 + SPP], [EPP 1.7 + ECP], [EPP 1.9 + ECP],
or [ECP]
This field specifies the Mode used for the parallel port (LPT1).
• On-Board Controllers
♦ Floppy – [Disabled] or [Enabled]
If this field is set to [Enabled], then the on-board Floppy controller is used.
♦ Primary IDE – [Disabled] or [Enabled]
If this field is set to [Enabled], then the on-board Primary IDE controller is used.
♦ Secondary IDE – [Disabled] or [Enabled]
If this field is set to [Enabled], then the on-board Secondary IDE controller is used.
♦ PS/2 Mouse – [Disabled] or [Enabled]
• If this field is set to [Enabled], then the on-board PS/2 Mouse controller is used and
assigned an IRQ by the BIOS, typically IRQ 12.
• If this field is set to [Disabled], then the on-board PS/2 Mouse controller is not used and
IRQ 12 is available for other devices.
♦ USB – [Disabled], [2 Ports] or [4 Ports]
• If this field is set to [4 Ports], both on-board USB controllers are used, each one
supporting two USB ports.
• If this field is set to [2 Ports], the first on-board USB controller is used, supporting two
USB ports, and the second on-board USB controller is disabled.
♦ Audio – [Disabled] or [Enabled]
If this field is set to [Enabled], the on-board Audio controller is used.
Video, Flat Panel, and Audio Options
• On-Board Video
♦ Framebuffer Size – [Disabled], [8MB], [16MB], or [32MB]
This field specifies the amount of system memory used for the on-board Video Framebuffer.
The amount of memory used for the Framebuffer of the on-board Video controller is
subtracted from the available system memory.
♦ AGP Aperture Size – [2MB], [4MB], [8MB], [16MB], [32MB], [64MB], [128MB], or
[256MB]
This field specifies the size of memory used for the AGP Aperture. The AGP Aperture Size
indicates the amount of system memory that can be used for the 3D engine. The system
memory is still available for the system use, unless an application actually uses the AGP
Aperture memory.
♦ Display – [CRT], [LCD], [LCD + CRT]
This field specifies the display type used.
• If [LCD] or [CRT+LCD] is selected, the panel type selection indicates the configuration
of the LCD panel attached. See the Panel Type field and Table 4-2.