6.2
Keyboard and Mouse Ports
A shared 26-way high density PS/2 connector on the front panel of the board provides
connections for a PC keyboard and a PS/2 mouse. The pin-out of the front panel connector is
detailed in Section A.5.1. A splitter cable (part number CB 26D/124) is required to access the
keyboard and mouse interfaces.
Power for the keyboard and mouse interfaces is protected by a 0.75A self-resetting current
limiting circuit. To reset this circuit, cycle the power to the board off and on again.
6.3
Graphics (VGA) Controller
An Asiliant Technologies 69030 graphics controller chip is fitted to this board. This chip includes
4 Mbytes of graphics RAM, and supports many different modes of operation, including VGA and
SVGA, with resolutions up to 1600x1200 and color depths up to 24 bits (16 million colors). The
CRT interface is available on a shared 26-way high density front panel connector. A splitter
cable (part number CB 26D/124) is required to access this interface.
See also Section 6.1 for information about how to switch the PC BIOS console device between
VGA screen and keyboard, and a serial port.
6.4
Real-Time Clock
A conventional PC Real-Time Clock is included on this board. This is Year 2000 compliant and
can be powered by an additional Lithium battery when main power to the board is removed. See
Section 2.7 for more details of how to fit or replace the battery. The Clock device also provides
242 bytes of CMOS RAM, in which the PC BIOS keeps much of its setup screen data and other
information.
6.5
Universal Serial Bus (USB)
One USB 1.0 interface is provided on this board. Channel 1 is connected via the CompactPCI J5
connector or a Transition Module. This channel can operate at 1.5Mbits/s or 12Mbits/s.
6.6
Power On Self Test LED/Speaker
The Power On Self Test (POST) LED is connected to the PC Speaker port. A connection for this
port is also made available via the CompactPCI J5 connector. This connection is driven by an
open-collector device and can drive a speaker of 32
W
or 64
W
impedance.
6-2
PP 110/01x
Other Interfaces
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