55
3 Interface Devices and Mass-Storage Drives
Audio Controller
Remote Power-On (RPO)
There is a cable from the Remote Start connector, on the network board, to
the External Start connector, on the system board. This is used by the
Remote Power-On feature (RPO) that is described on page 71. This cable
must be routed through the hole in the chassis. Not doing so, and allowing
the cable to be routed with the flexible disk drive and IDE cables, will raise
the risk of radio frequency interference (RFI) cross-talk.
The board is supplied with power, even whilst the rest of the computer is
turned off, via a line called VStandby on the External Start Connector. This
connector also carries the control lines which the network board uses to
turn on the main power supply, and to send or receive other control and
status information.
When shutdown into its RPO state, the board draws 20 mA, well within the
50 mA capability of the special RPO power supply.
Drivers
The board can be configured completely by software (no switches or
jumpers need changing). Drivers for the network board are supplied with
the computer. At the time of release, these bear the version number T.01.00.
Audio Controller
The Creative Labs CT2970 SoundBlaster 16 audio interface, supplied on
some models in an ISA slot, can be summarized as follows:
• line-out (stereo) jack: 20 Hz to 20 kHz frequency response, 83 dB signal
to noise ratio, 0.2% total harmonic distortion
• headphones jack: 2 W PMPO per channel, 32 Ω load
• speaker connector: 0.2% total harmonic distortion
• line-in (stereo) jack: 15 kΩ, 0 V to 2 V peak-to-peak
• CD audio-in connector: 15 kΩ, 0 V to 2 V peak-to-peak
• microphone input: 600 Ω, dynamic, 30 mV to 200 mV peak-to-peak
• MIDI /joystick interface connector: MPU-401 UART compatible
• 8-bit and 16-bit stereo sampling: 5 kHz to 44.1 kHz
• Creative OPL3 synthesizer: 20 polyphonic voices
• typical electrical current: +5 V (250 mA), +12 V (250 mA), -12 V (50 mA)
