Memory modules – Identifying a 30-pin module type If a motherboard RAM slot has 30 pins, which type of memory module does it accept?
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ASIMM (30-pin Single Inline Memory Module)
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BDIMM (Dual Inline Memory Module)
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CSDRAM DIMM (168-pin era)
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DAll of the above
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ENone of the above
Answer
Correct Answer: SIMM (30-pin Single Inline Memory Module)
Explanation
Introduction / Context:Different memory generations use distinct physical form factors. Accurate identification by pin count prevents installation errors and aids in supporting legacy systems.
Given Data / Assumptions:
- Slot has exactly 30 contacts (pins).
- We refer to classic desktop modules, not proprietary laptop SODIMMs.
- No adapters used.
Concept / Approach:
Early PCs (late 1980s–early 1990s) used 30-pin SIMMs for FPM/EDO DRAM. Later, 72-pin SIMMs appeared, followed by 168-pin SDRAM DIMMs, and then DDR generations with 184/240 pins, etc. Therefore, a 30-pin slot indicates a 30-pin SIMM.
Step-by-Step Solution:
Match pin count: 30 pins ↔ SIMM.Contrast: 72-pin SIMM (wider), 168-pin SDRAM DIMM (two notches), 184-pin DDR, 240-pin DDR2/DDR3, etc.Thus, only the 30-pin SIMM fits a 30-pin slot.Verification / Alternative check:
Mechanical keying prevents other module types from inserting. Motherboard documentation for vintage systems confirms 30-pin SIMM support.
Why Other Options Are Wrong:
DIMMs have far more pins; SDRAM DIMMs are 168-pin and incompatible. “All of the above” is clearly incorrect given mechanical mismatches.
Common Pitfalls:
Confusing 30-pin SIMM with 72-pin SIMM; assuming all “SDRAM” are DIMMs—some late SIMMs carried EDO DRAM, not SDRAM.
Final Answer:
SIMM (30-pin Single Inline Memory Module).