OCR J277 Mark Scheme - Primary Storage

OCR	GCSE (9-1) Computer Science Mark Scheme J277/01: Unit 1.2 Primary Storage

Question	Answer	Marks	Guidance
1	primary ROM start-up non-volatile RAM currently being used (or similar e.g., 'currently running') volatile	7	1 mark for each correct term in the correct place.
2	Row 1: ROM Row 2: RAM Row 3: RAM Row 4: RAM	4	1 mark per correct tick. If multiple ticks in one row, award 0 for that row.
3	To store data / instructions / applications / OS [1] ... that are currently in use / currently running [1]	2	AO1 (Knowledge) Do not award "stores data" without the qualification "currently in use". Reject: "stores files" (implies secondary storage).
4	It needs to store the start-up instructions / bootstrap / firmware [1] So that the instructions are not lost when the car engine/power is turned off [1]	2	AO2 (Application) Must link the purpose (instructions) to the characteristic (non-volatile) or the context (turning car off). Accept: references to the car's specific software not needing to be changed/updated frequently.
5	RAM is volatile whereas ROM is non-volatile [1] Meaning RAM loses data when power is off, but ROM keeps data when power is off [1]	2	AO1 (Knowledge) Award 1 mark for the definitions. Award 2nd mark for explaining what that means (power loss). If candidate just defines one (e.g. "RAM is volatile") without comparison, max 1 mark.