NASM - The Netwide Assembler

NASM Forum => Using NASM => Topic started by: mcheung63 on May 01, 2018, 06:09:40 PM

Title: 1.asm:2: error: invalid effective address
Post by: mcheung63 on May 01, 2018, 06:09:40 PM

Hi
  Why i got 1.asm:2: error: invalid effective address ?

bits 16
adc byte [dl], 0x12

Thanks
From Peter

Title: Re: 1.asm:2: error: invalid effective address
Post by: Frank Kotler on May 01, 2018, 06:41:01 PM

Hi Peter,
Welcome to the Forum.

Um... because it's not an effective address. Did you mean to write "di" instead of "dl"?

In 16-bit code, only bx and bp can be used as "base" registers and only si and di can be used as index registers. I know you're not that new to this - I suspect you just made a typo...

Best,
Frank