NCR 7454, User Manual, Page: 33 / 244

Chapter 1: Product Overview 1-13
Hardware Monitor
The hardware monitor generates an interrupt to the system whenever
any of the internal voltages used by the system processor goes above or
below the acceptable operating range. An interrupt is also generated
when the temperature of the Processor exceeds safe levels. Software
can use this indication to slow or stop the system and/or force a reset.
PCI Expansion Header
A single expansion header is provided to support optional features,
such as the PCMCIA for Wireless LAN Board. This board supports two
Type 2 or one Type 3 PCMCIA type cards.
IDE Header
A standard IDE header is provided to support the 2.5" hard disk drive.
Audio
The base unit has Sound Blaster-compatible audio. Wave table
synthesis is not supported. FM synthesis and MIDI are supported in
the hardware, but requires software driver support to function.
Higher quality integrated stereo speakers may be added as an option to
the terminal. The amplifier is located on the Processor Board; the
speaker output is provided on a header that receives the harness from
the speaker module. In addition, a Line Out is provided on a 3.5mm
stereo jack that permits connection of external amplified speakers.
The integrated stereo speakers, or an amplifier connected to Line Out,
must be used in order to play Sound Blaster (audio subsystem) audio.
However, an internal EUI speaker provides PC speaker functionality
(beeps and tones) for all configurations.
The volume control can be set during system configuration.
The PC speaker sounds (such as beeps and touch clicks) are directed
into the audio subsystem and are audible if speakers are connected.