Acer 486 Specifications download pdf (Page 26)

18 PCA-6143P User's Manual

Power LED and keylock (JP9)

You can connect an LED to indicate when the CPU card is on. Pin

1 of JP9 supplies power to the LED and Pin 3 is the ground. For

help finding JP9, refer to Chapter 1 (page 5).

You can use a switch (or a lock) to disable the keyboard. In this

state the PC will not respond to any input. This is useful if you

don’t want anyone to change or stop a running program. Simply

connect the switch between Pins 4 and 5 of JP9. The pin assign-

ments for JP9 appear in the following table:

Power LED and keylock (JP9)

Pin Function

1LED Power (+5 V)

2No Connection

3Ground

4Keyboard lock

5Ground

Hard disk drive LED (JP1)

You can connect a LED to connector JP1 to indicate when the

HDD is active. The pin on the top is positive.

Turbo switch (JP12)

You can connect a switch across the pins of jumper JP12 to

change the CPU between Turbo and non-Turbo mode. When you

close (short) the pins, the CPU card operates at full speed. When

you leave the pins open, the card operates at slow speed for

compatibility with older software.

You can also switch the CPU back and forth between Turbo mode

and non-Turbo mode using the keyboard, but only when jumper

JP12 is open. When jumper JP12 is closed, the CPU is fixed in

Turbo mode. To switch into Turbo mode from the keyboard

simultaneously press the Ctrl, Alt and keypad plus (+) keys. To

switch into non-Turbo mode press the Ctrl, Alt and keypad minus

(-) keys.

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Acer 486 Specifications Page 26