A.The SRAM is more reliable than DRAM but costlier than DRAM. One designer wanted to use SRAM for the OS area and DRAM for the user program area. Identify the problems that will be caused if this idea is accepted.
B. A computer’s memory is built using 81C4256 IC that is a 256 K × 4 DRAM. Calculate the number of chips needed to get a memory capacity of 4 MB.