11. Connector for docking mechanism motor
12. All pass-through I/O connectors
13. A/B switch
14. C/D switch
The following controllers are on the system board:
o Ethernet controller
o SCSI-2 controller
o Microcontroller (controls the battery charger, power up/down sequencing,
motor for the docking mechanism, and plug and play features for docking
and undocking)
Computer-Present Sensor
The computer-present sensor [3] (Figure 6-7) is an optical sensor on the
system board that detects when a computer is present in the docking bay of
the expansion base. When a computer is placed in the docking bay, the
computer pushes back a spring-loaded part that interrupts this sensor.
The computer-present sensor is integrated into the system board. To replace
the computer-present sensor, the system board must be replaced.
Motor Position Sensor
The motor position sensor [8] (Figure 6-7) is an optical sensor on the
system board that indicates when the computer is completely docked or
undocked by detecting a reflective spot on the docking mechanism gear.
The motor position sensor is integrated into the system board. To replace
the motor position sensor, the system board must be replaced.
Ethernet Controller
The expansion base has an integrated Ethernet controller that provides
network support with an AUI connector and an RJ-45 connector (Section 6.5).
The RJ-45 connector connects to 10BASE-T networks. The AUI connector
connects to 10BASE5 networks or (with an optional Thinnet Coax Transceiver)
to 10BASE2 networks. There is full +12V support on the AUI connector.
SCSI-2 Controller
The expansion base has an integrated SCSI-2 controller with active SCSI-2
termination on the SCSI-2 bus. The expansion base has an internal and
external SCSI-2 connector (Section 6.5).
Battery Charger
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