In computer architecture, which statement about semiconductor memory is generally accurate (considering typical RAM vs. historic magnetic core memory)?

Difficulty: Easy

Somewhat slower than magnetic core memory
A volatile memory (contents lost when power is removed)
Somewhat larger in physical size than magnetic core memory
All of the above
None of the above

Correct Answer: A volatile memory (contents lost when power is removed)

Explanation:

Introduction / Context:
Semiconductor memory underpins modern computing. Random access memory (RAM), particularly dynamic RAM (DRAM) and static RAM (SRAM), replaced magnetic core memory in mainstream systems because of speed, density, and cost advantages. This question asks you to identify the generally correct statement about semiconductor memory when contrasted with legacy core memory, while keeping in mind that we are talking about typical RAM behavior rather than every kind of semiconductor device (for example, ROM or flash).

Given Data / Assumptions:

Context focuses on main memory technologies historically: magnetic core memory vs. semiconductor RAM.
Semiconductor RAM (DRAM/SRAM) is volatile; it requires power to retain data.
Comparisons are about typical properties, not exceptional cases.

Concept / Approach:
Volatility is the most universal property of RAM: on power loss, the stored bits disappear. In contrast, magnetic core memory held data with persistent magnetic states and thus could retain information without power. Additionally, semiconductor RAM is generally much faster and far smaller in size per bit than core. Therefore, among the options presented, the statement identifying volatility is the consistent, domain-valid truth for RAM.

Step-by-Step Solution:

Identify the technology in scope: DRAM/SRAM as the typical “semiconductor memory.” Recall volatility: RAM needs power to preserve data; remove power and contents vanish. Contrast with core memory, which historically retained state without power. Select the option that correctly highlights volatility.

Verification / Alternative check:
Textbook summaries of memory technologies consistently classify RAM as volatile. Engineering handbooks list retention requirements and refresh cycles (for DRAM), reinforcing that power is essential for data retention.

Why Other Options Are Wrong:

“Somewhat slower than core” is false; semiconductor RAM is much faster. “Somewhat larger” is false; semiconductor memory is dramatically more compact than core memory. “All of the above” fails because the first and third statements are incorrect.

Common Pitfalls:
Confusing RAM (volatile) with semiconductor non-volatile memories like flash/ROM. The term “semiconductor memory” is broad, but in system design questions, unless specified otherwise, it typically refers to RAM used as main memory.

Final Answer:
A volatile memory (contents lost when power is removed)

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In computer architecture, which statement about semiconductor memory is generally accurate (considering typical RAM vs. historic magnetic core memory)?

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