Question

can someone solve this question using registers A, B, and R0.. and using basic coded don't use CMP and LEA. thank you

Write an Assembly language program to:

A) Store the following text " Welcome to Assembly Language" in the ROM at 200H

B) Find how many e letters in this word and store the count in the RAM in location 40H.

Answer 1

In 8086 architecture, a register is a memory location internal to the processor. we will generally have 4 registers namely

1. AX -primary accumulator used of input/output operations

2. BX - base register used for indexing addressing

3. CX - count register used for storing loop count

4. DX - data register

we will have different addressing modes

1. register addressing

2. immediate addressing

3. indirect addressing

now coming to the question

A) Assembly program:
section.data
msg dw 'Welcome to Assembly Language",0x200H   

section.text
global _start
_start: ;indicates the entry point
mov ax,msg
    

Explanation:
1.text section is the place where our actual code resides.
2.data section is the place where our program data resides.
  
msg dw "Welcome to Assembly Language",0x200H - through this statement we are declaring a memory location 0X200H which is named as msg and contents are "Welcome to Assembly Language"
here dw means "define word" means the size is 16bits 0r 2 bytes (in 32-bit system)

mov ax,msg - through this statement we are saying move the contents of memory location ( msg) to the register ax.