Specifications

Hardware Configuration
2–45
Note
Some operating systems, including some versions of DOS, turn off
the real-time clock alarm at boot time. If your OS does this, make
sure that your application program enables the alarm function
using this BIOS call.
2.15 UTILITY CONNECTOR (J16)
Seven functions appear on the 16-pin connector at J16. These are:
 Auxiliary power connections
 Power indicator LED
 PC speaker
 Push-button reset switch
 Security key switch
 Keyboard interface
 External back-up battery
Table 2–36 shows the pinout and signal definitions of the Utility Connector. Since there are connections
for diverse features on this single connector, you would usually choose a discrete-wire connector rather
than a ribbon cable connector, though this is not a requirement. Table 2-33 shows manufacturer’s part
numbers for both types of mating connectors.