HP unix manual Audio Connectors, TOC Button, Audio Electrical Specifications

Product Information

Rear Panel Components

Audio Connectors

The B2000 workstation has audio-input and -output capabilities through external input and output connectors on the rear panel and through an internal speaker. The sound is 16-bit, 44 kHz (CD-quality).

As shown in Figure 1-6, the workstation’s rear panel contains four audio connectors: Line In, Line Out, Microphone In, and Headphones Out.

Figure 1-6. Audio Connectors

Line In

Line Out

Microphone In

Headphones Out

The audio connectors are standard stereo audio mini-jacks. Hewlett-Packard recommends using gold-plated plugs available through audio retailers for best quality recording and playback through the external connectors.

Table 1-5 summarizes the audio electrical specifications for the B2000 workstation.

Table 1-5. Audio Electrical Specifications

Frequency Response	25 Hz to 20 kHz
Input Sensitivity/Impedance:
Line In	2.8Vp-p/10Kohm
Microphone In	40mVp-p/47Kohm
Maximum Output Level/Impedance:
Line Out	2.8Vp-p/920ohm
Headphones Out	5.6Vp-p/110ohm

TOC Button

The TOC (transfer of control) button interrupts the system and transfers control from the default device to an auxiliary device. A transfer of control saves the state of the processor in Processor Internal Memory (PIM) and begins execution of recovery software at a nonzero location specified by a special location in Page Zero called MEM_TOC. The TOC code is protected by a checksum.

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