Specifications

58
System Interface
The keyboard, a loudspeaker (to VCC), a hard-disk-LED (to VCC), a keylock (to
GND)and a reset-button (to GND) are connected to the 10-pin system interface (see
figure17). An external battery can also be connected. Please refer to table 16 for the
coding of individual pins.
Figure 23, System Interface
Table 16, System Interface Pin Assignment
Pin Signal Pin Signal
1 Speaker 2 GND
3 Reset 4 Keylock
5 Keyboard data 6 Keyboard clock
7 GND 8 VCC
9 VBAT 10 Hard-disk-buxy-LED
System
9
7
5
3
1
10
8
6
4
2
4.2