User Manual

2
INTRODUCTION 2
Thank you for choosing this innovative product. This keyboard is one of the SK-1800 series
products, which are 104/105 keys enhanced keyboards for IBM PC PS/2 and its compatibles.
There are no software modifications or special interfaces needed. Its use is the same as that
described in the Personal Computer Guide to Operations Handbook you received with your
Personal Computer. Itself can choose to attach Touchpad and extra mouse function.
OPERATION 3
3.1 PC PS/2 This keyboard is designed to be PS/2 mode Mode Selection selection
is done by auto-switchable.
3.2 Mode There are three LEDs on the keyboard to indicate Indicators 'Caps Lock',
'Num Lock' and 'Scroll Lock'.
The LEDs are 'toggled'. The first depression of the key turns on the LED.
The second depression turns the LED off and so on. LEDs are off on
power-up or software reset, but will flash during power-on initialization.
3.3 Type Ahead The keyboard has 16 keys type ahead capability.This means that you can
depress 16 keys before host can receive. If more keys are pressed before
the host allows keyboard output, the additional data is lost.
3.4 Typematic With the exception of the Pause key, all keys are Delay and typematic.
When a key is pressed and held down, the Repeat keyboard delays 0.5 sec.
and begins sending a make Rate Code for that key at a rate of 10.9 characters
per second. (The delay is called typematic Delay and the rate is called Repeat Rate.)
If two or more keys are pressed, only the last key pressed is repeated at the repeat
rate. Typematic operation stops only when the last key pressed is released, even if
other keys are still held down. If a key is pressed and held down while keyboard
transmission is disable, only the first make code is stored in the type ahead buffer.
This prevents the type ahead buffer overflow as result of typematic action.
The default data:
Typematic Delay = 0.5 sec.
Repeat Rate = 10.9 characters per sec.