CODEWITHSUNDEEP
assemblyx86-16emu8086
NoWeDoR
NoWeDoR

Reputation: 135

How the datas are loaded to wanted memory fields as byte?

We can write ASSIGN DB 10, 20, 30, 40, 50 command in emu8086 but it loads these bytes to random memory fields.

How can I load these bytes to the memory field I wanted? For example, I want to define these bytes beginning from A40EH.

Upvotes: 2

Views: 53

Answers (1)

Jose Manuel Abarca Rodríguez
Jose Manuel Abarca Rodríguez

Reputation: 10381

Memory addresses contain two parts : segment and offset. The segment is assigned by the operating system, the offset is determined by the data itself. The programmer can control the offset. In your case, if you want some data in a specific position you can fill your data segment with lots of bytes until you get the desired position, example : 

.model large
.stack 100h
.data
            ▼
filler db 0A40Eh dup(?)               ;◄■■ BYTES 0 TO 0A40DH.
ASSIGN DB 10, 20, 30, 40, 50, 'END$'  ;◄■■ BYTES START AT 0A40EH.

.code
  mov ax, @data
  mov ds, ax

  mov ah, 9
  lea dx, ASSIGN
  int 21h             ;◄■■ DISPLAY ASSIGN TO CHECK IF WORKS.

  mov ah, 0
  int 16h             ;◄■■ WAIT FOR A KEY PRESS.

  mov ax, 4c00h
  int 21h

Upvotes: 3

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