A Level Computer Science OCR Practice Exam 2025 - Free Practice Questions and Study Guide

The instruction that is used to load data in the Little Man Computer (LMC) model is LDA, which stands for "Load Accumulator." When this instruction is executed, it retrieves a value from a specified memory address and places it into the accumulator, which is a special register that holds intermediate data for operations. Loading data into the accumulator is essential for performing calculations or processing before producing any output.

The other instructions serve different purposes: STA is used to store the value from the accumulator into a specified memory location, BRA is a branch instruction that allows jumping to a different part of the program without affecting the accumulator, and BRP is a conditional branch instruction that directs the flow of execution based on whether the accumulator holds a positive value. Thus, LDA is the correct choice for loading data in the LMC architecture.