Pointing Device Interface Operation; Keyboard/Pointing Device Interface Connector - HP Compaq dc7800 Series Technical Reference Manual

Input/Output Interfaces

5.7.2 Pointing Device Interface Operation

The pointing device (typically a mouse) connects to a 6-pin DIN-type connector that is identical
to the keyboard connector both physically and electrically. The operation of the interface (clock
and data signal control) is the same as for the keyboard. The pointing device interface uses the
IRQ12 interrupt.

5.7.3 Keyboard/Pointing Device Interface Connector

The legacy-light model provides separate PS/2 connectors for the keyboard and pointing device.
Both connectors are identical both physically and electrically. Figure 5-7 and Table 5-6 show the
connector and pinout of the keyboard/pointing device interface connectors.
Figure 5-7. PS/2 Keyboard or Pointing Device Interface Connector (as viewed from rear of chassis)
Pin Signal
1 DATA
2 NC
3 GND
5-10
Table 5-6.
Keyboard/Pointing Device Connector Pinout
Description
Data
Not Connected
Ground
Pin Signal Description
4 + 5 VDC Power
5 CLK Clock
6 NC Not Connected
www.hp.com Technical Reference Guide