Microprocessor
HLT opcode means

  store result in memory.
  end of program.
  load data to accumulator.
  load accumulator with contents of register.

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

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

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