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assemblyhexemu8086

Why can't we MOV a value of A000H or higher into a 16-bit register?

I have tried most basic instruction "mov ax,B006H" and got the error message

error message

Solution

  • Hexadecimal numbers must start with a decimal digit. That is why so many hex constants start with a leading zero.

    This will work:

    mov ax, 0b006h