System Overview 1-5
The OptiPlex NX1 system contains an integrated controller and diskette drive
connector but is not equipped with a diskette drive. If you run the diskette-
based diagnostics, this computer requires an external diskette-drive kit as
described in Chapter 2, “Basic Troubleshooting.”
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The OptiPlex GX1 and OptiPlex NX1 systems include an integrated high-
performance 64-bit accelerated graphics port (AGP) subsystem, implemented
on the system board, which drives an external SVGA monitor. The AGP con-
tains a dedicated bus that bypasses the PCI bus and allows for interconnection
of the video subsystem directly to the Pentium chip set for the extra-high per-
formance required for 3D video subsystems. This architecture also off-loads
the PCI bus providing greater performance for devices attached to the PCI bus.
The maximum supported resolution is 1600 x 1200 with 65,535 colors at
75 Hz. The SVGA subsystem consists of the following major components:
ATI Rage Pro (AGP 2X) video controller
4-MB synchronous graphics random-access memory (SGRAM) video
memory (expandable to 8 MB via a video-memory upgrade kit)
15-hole monitor port
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The integrated audio controller is a single chip that connects to the ISA bus.
The audio controller has analog jacks for line-in and microphone input. The
single line-out output jack provides stereo output for a line-level input to an
external amplifier or drives stereo headphones. See “Technical Specifications”
found later in this chapter for audio jack input and output specifications.
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The ATI multimedia channel (AMC) implements a local graphics bus that allows
external devices to attach directly to the graphics controller. The AMC allows
devices to transfer video stream data to the graphics controller, for example,
MPEG-2 decoding for digital video disk (DVD) applications, or to receive video
stream data from the graphics controller to the device, for example, TV-Out
circuitry, or to do both simultaneously. Most of the video stream data trans-
fers occur on the AMC without congesting the PCI bus bandwidth.
The 40-pin AMC connector, shown in Figure 1-12, consists of three ports into
the graphics controller: a digital video stream (DVS) port for video input into the
graphics controller, a multimedia peripheral port (MPP) for video input and out-
put from the graphic controller, and an inter-integrated circuit (I
2
C)-compatible
serial control port for controlling the attached devices. A fourth port, audio
mixing bus (AMB), is not supported by the system. To route mixed audio from
an AMC-compliant adapter card to the system board, CD-ROM audio cables
must be attached from the adapter card’s CD-ROM audio input and CD-ROM
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