Microprocessor
DS directive in 8085

None of these
Forces the assembler to reserve a specified number of bytes in the memory
Forces the assembler to reserve a specified number of consecutive bytes in the memory
Forces the assembler to reserve one byte of memory

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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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Microprocessor
Which of the following statements for intel 8085 is correct?

 Program Counter (PC) specifies the address of the instruction last executed
 PC specifies the address of the instruction to be executed
 PC specifies the number of instructions executed so far
 PC specifies the address of the instruction being executed

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