Multiple choice

What was the name of IO.SYS on early IBM's DOS version?

  1. IBMIO.SYS

  2. IBMBIO.COM

  3. ROMBIOS

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In early IBM versions of DOS (PC DOS), the file IO.SYS was named IBMBIO.COM. These were the basic input/output system files that handled hardware interactions during boot.

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