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Microprocessor

Microprocessor
Identify the programmable DMA controller from the following

 8253
 8251
 8257
 8279

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Microprocessor
Inintel 8085A microprocessor ALE signal is made high to

 To disable data bus
 To latch data D0-D7 from data bus
 To achieve all the functions listed above
 Enable the data bus to be used as low order address bus

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Microprocessor
Temporary registers in 8085 are

 H and L.
 D and E.
 B and C.
 W and Z.

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Microprocessor
EPROMs are preferred for storing programs while developing new microprocessor based system. Because of their

 erasable and programmable characteristic
 non-volatile characteristic
 random access characteristic
 all the above characteristic

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Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 8085 has 5 interrupts lines, whereas 6800 has only two
 8085 has multiplexed bus, whereas 6800 does not have
 None
 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O

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Microprocessor
A bus connected between the CPU and main memory that permits transfer of information between main memory and the CPU is known as

 Control bus
 Address bus
 DMA bus
 Memory bus

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