=> R0 = 202
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = status before being overwritten
R2 = serial input threshold (see OS_Byte 203)
The keyboard status byte holds information on the current status of the keyboard, such as the setting of Caps Lock. This call enables you to read and change these settings. Note that this call does not update the LEDs. If you don't stamp this state with OS_Byte 118, the LEDs won't be switched on or off. The default state of Caps Lock is stored in CMOS byte 11.
See PRM 1, page 883
Status byte format
Bit Value State Meaning
0 - - Reserved for the keyboard handler, must be preserved when writing
1 0 off Scroll lock
1 on
2 0 on Num Lock
1 off
3 0 off Shift
1 on
4 0 on Caps Lock
1 off
5 0 Kana lock (Hiragana entry)
1 Romanji lock (Latin entry, as in UK)
6 0 off Control
1 on
7 0 off Shift Enable
1 on
On means LED on or key pressed, off the opposite. If Caps Lock is on and Shift Enable off, Shift will have no effect on the letters, if Shift enable is on, you'll get lower case.
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