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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




file: /Techref/int/16.htm, 4KB, , updated: 1999/2/20 10:27, local time: 2024/12/22 23:57,
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