CODEWITHSUNDEEP
assembly
Fezofchekov
Fezofchekov

Reputation: 69

How can I receive a key press from keyboard in assembly (8086 emu)?

How can I receive a key press from keyboard in assembly (8086 emu)? ..such that when some specific key is pressed, then some action need be taken (an action like adding 2 numbers or sth like that)...

For example, let's say I have the value 2 stored in AX ,the value 3 in BX , and while running the code, if I pressed "+" for example, then Add AX and BX, and if I pressed "-" then subtract AX from BX, otherwise don't do anything..

Can anyone explain the code to do that in details? I'm a complete newbie to Assembly.

Upvotes: 0

Views: 3562

Answers (1)

Zahid Khan
Zahid Khan

Reputation: 3203

You asked 2 Questions in a Single Question:
1. Getting Values From Keyboard

 MOV AH,01h
 INT 21H

The entered number will be stored in DL general purpose register in ASCII Form.

Example:
You entered 'A' that has an ASCII value of 65 the DL will contain a value of 01000001.
To learn more about ASCII value I'd like to suggest you ASCII Table

2. Performing Operations based on Input:
You can perform various operations simply by comparing the value of DL register with ASCII values. Example:

    CMP DL, 43 ; '+' has ASCII value of 43 
    JE addition;
     <<Some code here>>
     <<Some code here>>
     <<Some code here>>
ADDITION:
     ADD AX , BX

Upvotes: 1

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