Microprocessor
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 all interrupts except non-maskable interrupt are disabled
 the microprocessor cannot be interrupted by any mask able interrupt
 the microprocessor cannot be interrupted by any interrupt
 the microprocessor can be interrupted by a non-mask able interrupt

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Microprocessor
Cycle stealing mode of DMA operation involves

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

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Microprocessor
In an 8085 microprocessor based system, the contents of SP are 2000H. POP H instruction will transfer the contents of memory location

 2000H and 1FFFH to H and L registers respectively
 2001H and 2000H to H and L registers respectively
 2001H and 2002H to H and L registers respectively
 2000H and 1999H to H and L registers respectively

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