User's Manual

2. GENERAL
Thank you for choosing this innovative product. The keyboard is one of the SK-1689 series products. SK-1689 model
is Multimedia keyboard, which has 21 hot keys and it is configurable 104/105/106/107/109 keys languages layout
according to customer’s requirement. It includes L-WIN, R-WIN and APP allowing this model of keyboard to be used
with IBM PC AT/PS/2 or its compatibles and support PC98 ACPI power key. It is not limited to special software and
interfaces. It can run in Win95, Win98, WinNT and Win2000 operation system.
The Windows Logo is a registered trademark of Microsoft Corporation.
3. OPERATION
3.1 AT & PS/2:
The keyboard is designed to two modes of AT & PS/2. The mode is selected by auto-switchable.
3.2 Mode:
There are three LEDs on the keyboard to indicate ‘Caps Lock’, ‘Num Lock’, ‘Scroll Lock’ and ‘hot key’. The LEDs are
togged. The first depression of the key turns on the LED. The second depression turns the LEDs off and so on. LEDs
are off on power-up or software reset, But will flash during power-up initialization. When the ‘hot key’ is pressed, the
forth LED is lighted.
3.3 Key presses buffer:
The keyboard has 16 keys FIFO buffer to stores the scan codes until the host is ready to receive. Buffer overrun
occurs when more than 16 keys depressed and stored without being sent, then an overrun code replace the 17
th
key
press to be stored in buffer: Further keys pressed after the 16
th
data, it will be lost if host keep in busy and disable
keyboard to send out contents in buffer.
3.4 Typematic delay and repeat rate:
In set 2, except the “PAUSE” key, all keys are typematic. When a key is pressed and hold down, keyboard will delay
500 msec han send the first repeat make code. If key keep being held down, it will send repeatedly at the rate of 10.9
characters per second.
If two or more keys are depressed, only the last key will be repeated at the repeat rate. When the last released
typematic operation stops, even if other keys are still held down. If a key is pressed and held down while keyboard
transmission is disable only the first key’s make code is stored in the type ahead buffer. This prevent a type ahead
buffer overflow when the typematic operation actions.
The default data:
Typematic Delay = 500msec
Repeat Rate = 10.9 characters per sec.
Volume Up and Volume Down is not same as key scan code default rating.