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

 Devices have 8-bit address line
 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

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Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 counts the number of programs being executing on the microprocessor
 counts the number of instructions being executing on the microprocessor
 holds the address of the top of the stack

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Microprocessor
When referring to instruction words, a mnemonic is

 shorthand for machine language.
 a short abbreviation for the operand address.
 a short abbreviation for the data word stored at the operand address.
 a short abbreviation for the operation to be performed.

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Microprocessor
Cycle stealing mode of DMA operation involves

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

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Microprocessor
A good assembly language programmer should use general purpose registers rather than memory in maximum possible ways for data processing. This is because:

 Data processing with registers takes fewer cycles than that with memory
 Of limited set of instructions for data processing with memory
 Data processing with registers is easier than with memory
 Data processing with memory requires more instructions in the program than that with registers

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