2.4.2 PS/2 keyboard and PS/2 mouse
The PPC-A84/A120 provides two PS/2 connectors that support a PS/2 style keyboard and a PS/2 mouse. In most cases, especially in embed- ded applications, a keyboard is not used. The standard PC/AT BIOS will report an error or failure during power-on self-test (POST) after a reset if the keyboard is not present. The BIOS standard setup menu allows you to select* "All , But Keyboard" under the "Halt On" selection. This allows no-keyboard operation in embedded system applications without the system halting under POST. Note that the mouse port on the PPC-A84/A120 is a PS/2 mouse port.
* Note: "All, But keyboard" is the default setting.
2.4.3 Mic-in, line-in, speaker out
The PPC-A84/A120 is equipped with a high quality audio interface, which provides 16-bit CD quality recording and playback as well as OPL3 compatible FM music. It is supported by all major operating systems and is completely compatible with Sound Blaster Pro.
The audio interface includes three jacks: microphone in, line out and line in. (See Fig. 2-4.) Their functions are:
Microphone in: Use an external microphone to record voice and sound.
Line out: Output audio to external devices such as speakers or earphones.
Line in: Input audio from an external CD player or radio.
1.Connect the audio device to the system.
2.Install the driver before you use the device.
2 8 PPC-A84/A120 User's Manual
