Overview
2-15
Service Periodic Maintenance
Contents
Schematics Illustrated PartsInstallation
Host Pentium CPU Motherboard
Nearly all Workstation functions are software controlled. The software executes in a multi-processor environment in
the Host Pentium CPU, which communicates over the ARCNet bus to control the other intelligent devices in the
Workstation and in the X-ray generator.
When the Workstation powers up, the Host Pentium CPU loads system or diagnostic software from a 1.44 Mb floppy
disk mounted in the floppy disk drive located at the rear of the Workstation. If the floppy disk drive is empty (usually
the case) the host Pentium CPU instead loads system software from the Workstation IDE hard disk drive. Following a
successful boot-up with software loaded into memory, the motherboard begins various run-time chores such as
initializing intelligent peripheral devices and processing user inputs.
The motherboard has four 16-bit ISA slots, three of which are used. These slots are usually populated with the
System Interface PCB, optional Laser Camera Interface, and Video Controller PCB. The spare ISA bus slot is
normally empty, but it can accommodate a VGA video card for diagnostic purposes.
There are four 32-bit PCI bus slots, all of which are used. These slots support the Display Controller PCB, Image
Processor PCB, Cine Bridge or SCSI Controller, and Ethernet (DICOM) card.
Single Board Computer and Passive Backplane
Earlier versions of the Host Controller consisted of a standard Socket 7 motherboard equipped with conventional PCI
and ISA slots that accommodated the peripherals.
The current version of the Host Controller consists of a Passive Backplane that supplies the PCI and ISA slots. A
special slot on the Passive Backplane accommodates the Single Board Computer (SBC), which performs the same
functions as the earlier motherboard, but is easier to troubleshoot and replace.
Please refer to Section 4 - Host Controller for more information.
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