computer organisation

[annitaz]

What is the maximum memory locations that can be addressed by a chip with 20 address pins?

 

(1) 20

(2) 262 144

(3) 524 288

(4) 1 048 576

(5) None of the above

 

Can anyone tell me how I can calculate the memory locations?

 

A memory has 1024 storage units with a width of 32. Suppose that the memory is byte addressable. What is the address of the highest addressable memory position?

 

(1) 1023

(2) 1024

(3) 2048

(4) 4096

(5) 4095

Is the correct answer 4095 (1024x4(sets of 8 bits)) =4096-1=4095??

Is that correct?

[BC_Programming]

question 1:

2^20=1048576 addressable storage locations. Note that a "storage location" is generally known as a "segment" and in this case the segment offset to each specific byte would need to be in a separately stored offset.

 

the second question depends on wether the first byte is addressed as 0 or 1. usually 0 is a "null" sentinel, so almost all pointers to memory (memory addresses) would be >0, so the answer would be 4096.