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24 votes
24 votes

How many $32K \times 1$ RAM chips are needed to provide a memory capacity of $ 256K$ bytes?

  1. $8$
  2. $32$
  3. $64$
  4. $128$
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6 Answers

Best answer
36 votes
36 votes

Answer is : (c) 64

Total number of RAM chips

$$\begin{align*}&= \frac{\text{Total size}}{\text{1 RAM size}} \\
&=\frac{256 \text{ K-bytes}}{ 32 \times 1} \\
&= \frac{2^8 \times 2^{10} \times 2^3}{ 2^5\times 2^{10}}\\
&=  2^6 = 64 \end{align*}$$

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6 votes
6 votes

total number of RAM chip = Total size /1 RAM size
                                       =256K bytes/ 32*1
                                       = 2210 *23/ 25*210

                                       =  26 = 64
Option C

4 votes
4 votes
*1 refers bit so each row requires 8bits i.e that becomes byte for row 8 chips are needed..like that 256/32=8 columns are there

totally 8columns*8=64
Answer:

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