Interrupt table for c programming language


Interrupt table
List of interrupt numbers and its use



Input
Output
Service No
Use

Interrupt No: 0X33 Use: Mouse
ax

1
Show mouse pointer
ax

2
Hide mouse pointer
ax

0
Initialize mouse

ax
0

ax

7
X co-ordinate restriction
cx

X1 co-ordinate

dx

Y1 co-ordinate

ax

8
Y co-ordinate restriction
cx

X2 co-ordinate

dx

Y2 co-ordinate

ax

3
Get mouse position

bx
Button


cx
X position


dx
Y position

ax

4
Set mouse position
cx

X co-ordinate

dx

Y co-ordinate

ax

5

bx

B=0 left



B=1 right



B=2 center


ax
Button status


bx
Button press counter


cx
X co-ordinate


dx
Y co-ordinate

ax

9
Set graphics pointer shape
bx

Hot spot offset from left

cx

Hot spot offset from right

es:dx

Segment: offset

ax

0XA
Set text pointer type
bx

Pointer type



0-soft type



1-Hardware

cx

Starting line number

dx

Ending line
number


Interrupt no: 0X10 Use: Monitor
ah

2
Positioning cursor
dh

row no

dl

Column no

bh

Page no

ah

6
Clear screen
al

0 to clear
N line to scroll
ch

St.row

cl

St column

dh

End row

dl

End column

bh

Col

ah

6
Scroll window l line up
al

1

bh

Color

ch

St row

cl

St column

dh

End row

dl

End column

ah

8
Read a character from screen
bh

Page



Ah

ah

9
Write a char on a screen
bh

Page



Ah

ah

0
Set video mode
al

0x13
Switch to 320 X 200 and 256 color graphics mode

Ch
0x12
Switch to 640X480 and 16 color graphics mode

Cl
0x11
Switch to 640X480 and 2 color graphics mode

Dh
0x3
Switch to 25X80 and 16 color test mode

dl
0x1
Switch to 40X25 and 16 color text mode
ah

0x2
Switch to 80X25 and 16 color text mode
bh

3
Get cursor position


Page number



Starting line for cursor



Ending line for cursor



Row position



Col position



Page number

ah



bh




Interrupt No: 0X1A Use: Time


2
Get Time
Ah
Ch
Hours


Cl
Minutes


Dh
Second


Dl
Daylight-saving



Time code

Ah

3
Set time
Ch

Hours

Cl

Minutes

Dh

Second

Dl

Daylight-time

ah

4
Get date

Ch
Century


Cl
Years


Dh
Month


dl
day

Ah

5
Set date
Ch

Century

Cl

Year

Dh

Month

dl

day


Interrupt No: 0X16 Use: Key Board
Ah

0
Get the scan code

Ah



al

Get ascii code





Interrupt No: 0X21 Use: Miscellaneous
Ah

1
Echo input character on screen

al
Data

Ah

2
Character output
Dl

Character

Ah

5
Pinter output
Dl

Character

Ah

9
Display string
Ds:dx

String

Ah

0XE
Select disk
Dl

Drive no

Ah

0XF
Open file
Ds:dx

File control

Ah

0X10
Close file
Ds:dx

File control

Ah

0X11
Find first file
Ds:dx

File control

Ah

0X12
Find next file
Ds:dx

File control

Ah

0x13
Delete file
Ds:dx

File control

Ah

Ox16
Create file
Ds:dx

File control

Ah

0x17
Renaming file
Ds:sx

Special file control

Ah

0x19
Get current disk

Al


Ah

Drive number

Ds:dx

0x23
Get file size


File control

Al
ah
0x25
Set interrupt
Ds:dx

New function

Ah

0x35
Get interrupt vector
Al

Interrupt no



Interrupt handler

Ah

0x39
Create a directory
Ds:dx

Directory name

Ah

0x3A
Delete directory
Ds:dx

Directory name

Ah

0X3B
Set current directory
Ds:dx

Directory name

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