Microprocessor
HLT opcode means

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

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Microprocessor
When referring to instruction words, a mnemonic is

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

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Microprocessor
A high on RESET OUT signifies that

 all the registers and counters are being reset and this signal can be used to reset external support chip
 processing can begin when this signal goes high
 all the registers of the CPU are being reset
 all the registers and counters are being reset

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 The data line can be multiplexed for both input and output
 More than one device can transmit over the data bus at the same time
 It increases the speed of data transfer over the data bus
 More than one device can transmit information over the data bus by enabling only one device at a time

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