Microprocessor
A microprocessor is ALU

 and control unit on a single chip.
 register unit and I/O device on a single chip.
 and memory on a single chip.
 register unit and control unit on a single chip.

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Microprocessor
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

 Devices are accessed using IN and OUT instructions
 There can be maximum of 256 input devices and 256 output devices
 Arithmetic and logic operations can be directly performed with the I/O data
 Devices have 8-bit address line

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Microprocessor
Cycle stealing mode of DMA operation involves

 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
 Data transfer takes place between the I/O device and memory during every alternate clock cycle
 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device

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