Speaker Connector
Pins 1-4 provide an interface to a speaker for audio tone generation. This connector provides four pins but only two used. A speaker with 8-Ohm or higher impedence is reccomended.
1 - Speaker Out
2 - N.C.
3 - Ground
4 - +5V
Power LED and Keylock Connector
Pins 11-15 allow the user to connect the power LED and keylock switch of the system's front panel. The power LED indicates the NO/OFF status of the system. The keylock switch, when, CLOSED, will disable the keyboard function.
11 - Power LED
12 - N.C.
13 - Ground
14 - Keylock
15 - Ground
Turbo Switch Connector
Pins 7 & 17 allow the user to connect a turbo switch on the front panel of the system. A turbo switch is usually a push-on switch. When the switch is on, pins 7 & 17 are SHORTED and the system will be running at FULL (Turbo) speed. To switch to LOW (non-turbo) speed, simply press the switch.
Orientation is not required when connecting a turbo switch to pins 7 & 17 of J1.
Turbo LED Connector
Pins 8 & 18 provide the user with an interface for connecting a turbo LED indicator in the system's front panel. This LED, when on, indicates the TURBO (full) speed mode of the system.
8 - Anode
18 - Cathode
Reset Switch Connector
Pins 9 & 19 provide an interface for a reset switch. The reset switch allows the user to reset the system without turning the power switch off and on. To reset the PAT48PR based system, SHORT pins 9 & 19 by pressing the reset switch of the system chassis.
Orientation is not required when connecting a reset switch pins 9 & 19.
Hard Disk LED Connector: J1 (pins 10 & 20), J2 (to the right of J1)
These connectors allow the user to connect the hard disk LED on the system's front panel. The LED will be on whenever the system is accessing the hardrive. Connect the 2-pin connector from the chassis to pins 10 & 20 of J1. Also, make a connection from J2 to the hard disk controller's LED interface.
You may also connect the HDD LED on the system's front panel directly
to the hard disk controller's LED interface without using these connectors.
J1 (pins 10 & 20) - LED in
J2 - LED out