Interrupt 16h  Keyboard I/O
(0:0058h)       access the keyboard  
 
 
Function  00h   Get Keyboard Input - read the next character in keyboard buffer, 
		if no key ready, wait for one. 
entry   AH      00h      
return  AH      scan code  
	AL      ASCII character  
	
 
Function  01h   Check Keystroke Buffer - Do Not Clear 
entry   AH      01h     
return  ZF      0 (clear) if character in buffer 
		1 (set)   if no character in buffer 
	AH      scan code of character (if ZF=0) 
	AL      ASCII character if applicable 
note    Keystroke is not removed from buffer 
 
 
Function  02h   Shift Status - fetch bit flags indicating shift status  
entry   AH      02h 
return  AL      bit codes (same as [0040:0017]) 
		bit 7   Insert state 
		bit 6   CapsLock state 
		bit 5   NumLock state 
		bit 4   ScrollLock state 
		bit 3   Alt key 
		bit 2   Control key 
		bit 1   Left shift (left caps-shift key) 
		bit 0   Right shift (right caps-shift key) 
note    other codes found at [0040:0018] 
		bit 7   Insert shift (Ins key) 
		bit 6   Caps shift (CapsLock key) 
		bit 5   Num shift (NumLock key)  
		bit 4   Scroll shift (ScrollLock key) 
		bit 3   Hold state (Ctrl-NumLock is in effect) 
 
  
Function 03h    Keyboard - Set Repeat Rate            (PCjr, AT, XT/286, PS/2) 
entry   AH      03h  
	AL      00h     reset typematic             (PCjr) 
		01h     increase initial delay      (PCjr) 
		02h     increase continuing delay   (PCjr) 
		03h     increase both delays        (PCjr) 
		04h     turn off typematic          (PCjr) 
		05h     set typematic rate          (AT, PS/2) 
	BH      00h-03h for delays of 250ms, 500ms, 750ms, or 1second 
			0,0     250ms 
			0,1     500ms 
			1,0     750ms 
			1,1     1 second 
	BL      00h-1Fh for typematic rates of 30cps down to 2cps 
			00000 30     01011 10.9   10101 4.5 
			00001 26.7   01100 10     10110 4.3 
			00010 24     01101 9.2    10111 4 
			00011 21.8   01110 8.6    11000 3.7 
			00100 20     01111 8      11001 3.3 
			00101 18.5   10000 7.5    11010 3 
			00110 17.1   10001 6.7    11011 2.7 
			00111 16     10010 6      11100 2.5 
			01000 15     10011 5.5    11101 2.3 
			01001 13.3   10011 5.5    11110 2.1 
			01010 12     10100 5      11111 2 
 
 
Function 04h    Keyboard Click Toggle                 (PCjr and Convertible) 
entry   AH      04h 
	AL      00h     for click off 
		01h     for click on  
	   
 
Function 05h    Keyboard Buffer Write            (AT or PS/2 with enhanced kbd) 
		(XT/286, PS/2, AT with "Enhanced" keyboard) 
entry   AH      05h 
	CH      scan code 
	CL      ASCII character 
return  AL      01h if buffer full 
 
 
Function 10h    Get Enhanced Keystroke And Read      (F11, F12 Enhanced Keyb'd) 
		(XT/286, PS/2, AT with "Enhanced" keyboard) 
entry   AH      10h 
return  AH      scan code 
	AL      ASCII character if applicable 
 
 
Function 11h    Check Enhanced Keystroke         (F11-F12 on enhanced keyboard) 
		(XT/286, PS/2, AT with "Enhanced" keyboard) 
entry   AH      11h 
return  ZF      0       (clear) if key pressed 
		1       if buffer empty 
	AH      scan code (when ZF=0) 
	AL      ASCII character if applicable (when ZF=0) 
note    Keystroke is not removed from buffer 
 
  
Function 12h    Extended Get Shift Status         (F11, F12 Enhanced keyboard) 
entry    AH     12h 
return   AL     bit 
		0       right Shift key depressed 
		1       left Shift key depressed 
		2       Control key depressed 
		3       Alt key depressed 
		4       ScrollLock state active 
		5       NumLock state active 
		6       CapsLock state active 
		7       insert state is active 
	AH      0       left Control key pressed 
		1       left Alt key depressed 
		2       right Control key pressed 
		3       right Alt key depressed 
		4       Scroll Lock key depressed 
		5       NumLock key depressed 
		6       CapsLock key depressed 
		7       SysReq key depressed 
 
 
Function F0h    Set CPU speed (Compaq 386) 
entry   AH      F0h     set speed 
return  unknown 
note    used by Compaq DOS MODE command. 
	parameters not availible 
 


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