Int 16 Fn 4B  - Frank Klemm Keyboard Driver V2.0 - Api                     [K]

   AH = 4Bh
   CX = code or action
       0000h-FEFFh key code
       FF00h-FFFFh action (see #0518)
   BL = scan code (normal keys) or scan code + 60h (enhanced keys)
   BH = shift state (see #0519)

Return: CX = previous code or action

(Table 0518)
Values for Frank Klemm Keyboard Driver action code:
 FF00h no action
 FF01h hardcopy
 FF02h left shift
 FF03h right shift
 FF04h left Ctrl
 FF05h right Ctrl
 FF06h left Alt
 FF07h right Alt / AltGr
 FF08h CapsLock
 FF09h NumLock
 FF0Ah ScrlLock
 FF0Bh Insert (returns code 5200h or 52E0h)
 FF0Ch Pause
 FF0Dh Ctrl-Break function
 FF0Eh warm boot via far jump to F000h:FFF0h
 FF0Fh terminate current program
 FF10h key for entering keys via Alt-numpad (read-only)
 FF11h clear keyboard buffer
 FF12h reset (warmboot on XT)
 FF13h mouse sensitivity (read-only)
 FF14h keyjobs (read-only)
 FF15h SysRq
 FF16h turn on CPU cache (486+)
 FF17h turn off CPU cache (486+)

See Also: #0519

(Table 0519)
Values for Frank Klemm Keyboard Driver shift state:
 00h   no shift keys
 01h   either Shift
 02h   either Ctrl
 03h   left Alt
 04h   Ctrl + Alt
---standard keyboard---
 05h   right Alt / AltGr
---Russian keyboard---
 05h   Russian + no shift keys
 06h   Russian + either Shift

See Also: #0518