Multiple choice technology mainframe

What are the address length of BC and EC operation modes?

  1. 32 and 32 bit respectively

  2. 24 and 32 bit respectively

  3. 24 and 24 bit respectively

  4. 32 and 24 bit respectively
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In IBM mainframe architecture, BC (Base Counter) mode uses 24-bit addressing while EC (Extended Control) mode uses 32-bit addressing. This reflects the evolution from the original 24-bit addressing scheme to the extended 32-bit addressing introduced later to support larger memory spaces.

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