GCSE Unit 2 Prep - Assembly language and logic gates

Which assembly language instruction is used to read input from a device?

• INP

• OUT

• STA

• LDA

Answer explanation

The INP instruction in assembly language is used to read input from a device or input port. It allows the program to receive data from an external source, such as user input or another device connected to the system.

Which assembly language instruction is used to send output to a device?

• INP

• OUT

• STA

• LDA

Answer explanation

The OUT instruction in assembly language is used to send output to a device or output port. It allows the program to send data to an external destination, such as a display or another device connected to the system.

Which assembly language instruction is used to store the value in the accumulator to a memory location?

• INP

• OUT

• STA

• LDA

Answer explanation

The STA instruction in assembly language is used to store the value in the accumulator to a memory location. It allows the program to save the contents of the accumulator to a specific memory address for future use.

Which assembly language instruction is used to load a value from a memory location into the accumulator?

• INP

• OUT

• STA

• LDA

Answer explanation

The LDA instruction in assembly language is used to load a value from a memory location into the accumulator. It allows the program to retrieve data from a specific memory address and store it in the accumulator for further processing.

Which assembly language instruction is used to perform addition?

• INP

• OUT

• ADD

• SUB

Answer explanation

The ADD instruction in assembly language is used to perform addition. It allows the program to add the value in the specified memory location or immediate operand to the contents of the accumulator.

Which assembly language instruction is used to perform subtraction?

• INP

• OUT

• ADD

• SUB

Answer explanation

The SUB instruction in assembly language is used to perform subtraction. It allows the program to subtract the value in the specified memory location or immediate

Which assembly language instruction is used to halt or stop the program execution?

• BRA

• HLT

• DAT

• SUB

Answer explanation

The HLT instruction in assembly language is used to halt or stop the program execution. When encountered, it terminates the program and prevents any further instructions from being executed.

Which assembly language instruction is used for unconditional branching or jumping?

• BRA

• HLT

• DAT

• SUB

Answer explanation

The BRA instruction in assembly language is used for unconditional branching or jumping. It allows the program to transfer control to a different memory location, specified by a label or an address, without any condition.

What is the purpose of the DAT instruction in assembly language?

• To perform input/output operations.

• To define data values.

• To store the value in the accumulator to a memory location.

• To load a value from a memory location into the accumulator.

Answer explanation

The DAT instruction in assembly language is used to define data values in memory. It allows the programmer to assign specific values to memory locations for later use in the program.

What type of logic gate is this?

• AND

• OR

• NOT

• XOR