Question

Int 10H question

Asked by: bbk_doll

Hello Experts, please tell me what does the following interrrupts do
1)
MOV AX 1001H
MOV BH,01
INT 10H


2)
MOV AX 1003H
MOV BL,0
INT 10H

3) What values does the instruction MOV AX 1003H move into AH, AL

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Asked On
2007-01-04 at 22:12:24ID22111874
Tags

10h

,

int

Topic

Assembly Programming Language

Participating Experts
2
Points
100
Comments
3

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Answers

 

by: bbk_dollPosted on 2007-01-05 at 07:58:34ID: 18252072

hello experts, no reply for the whole day, kept waiting.
please help.
thanks .

 

by: mzvikaPosted on 2007-01-05 at 12:39:58ID: 18254640

AX is a 16 bit register. its low 8 bits are called AL and its haigh 8 bits are called AH.
so, when you put the value 1003H into AX, you put 10h into AH and 03 into AL.

as for int 10h: when you call the interrupt, AX holds the function code. BL/BH are function specific parameters.
for specific information about certain function, take a look here:
http://lrs.uni-passau.de/support/doc/interrupt-57/INT-10.HTM

AX = 1001h  http://lrs.uni-passau.de/support/doc/interrupt-57/RB-0099.HTM
AX = 1003h  http://lrs.uni-passau.de/support/doc/interrupt-57/RB-0101.HTM

 

by: dimitryPosted on 2007-01-06 at 14:57:38ID: 18259701

To add to mzvika answer:

1) Sets VGA screen border to BLUE
MOV AX 1001H
MOV BH,01
INT 10H

2) Enable bold background
MOV AX 1003H
MOV BL,0
INT 10H

20120131-EE-VQP-002

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