=> R0 = 118
<= R0 preserved
R1,R2 corrupted
The settings of Caps Lock, Scroll Lock and Num Lock are held in a location referred to as the keyboard status byte. See OS_Byte 202 for details of this. Under normal circumstances they are shown by the LEDs on the keyboard, but these are not updated when the status is changed using OS_Byte 202. This call ensures that the current contents of the keyboard status byte are reflected in the LEDs.
See PRM 1, page 862
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