46. Typically, how often is DRAM refreshed?
(a) 2 to 8 ms
(b) 4 to 16 ms
(c) 8 to 16 s
(d) 1 to 2 s
47. Which of the following is one of the basic characteristics of DRAMs?
(a) DRAMs must have a constantly changing input.
(b) DRAMs must be periodically refreshed in order to be able to retain data.
(c) DRAMs have a broader “dynamic” storage range than other types of memories.
(d) DRAMs are simpler devices than other types of memories.
48. How can UV erasable PROMs be recognized?
(a) There is a small window on the chip.
(b) They will have a small violet dot next to the #1 pin.
(c) Their part number always starts with a “U”, such as in U12.
(d) They are not readily identifiable, since they must always be kept under a small cover.
49. A 64-Mbyte SIMM is installed into a system, but when a memory test is executed, the SIMM is detected as a 32-Mbyte device. What is a possible cause?
(a) The memory module was not installed properly.
(b) The voltage on the memory module is incorrect.
(c) The most significant address line is stuck high or low.
(d) The address decoder on the SIMM is faulty.
50. Nota
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