A-LevelComputer ScienceAssembly LanguageMay/June 2022Paper 3 Q910 Marks
The table shows assembly language instructions for a processor that has one general purpose register, the Accumulator (ACC). Instruction Table: Label | Opcode | Operand | Explanation ---|---|---|--- | LDM | #n | Load the number n to ACC | LDD | <address> | Load the contents of the given address to ACC | LDI | <address> | The address to be used is at the given address Load the contents of this second address to ACC | ADD | <address> | Add the contents of the given address to the ACC | STO | <address> | Store the contents of the ACC at the given address <label>: | <data> | Gives a symbolic address <label> to the memory location with the contents <data>. <label> can be used in place of <address> # denotes a denary number, e.g. #123
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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