SLR04 – Operating systems – Systems software (AS & A’Level) OCR A’LEVEL SLR04 Need for operating systems OCR A’LEVEL SLR04 Paging, segmentation and virtual memory OCR A’LEVEL SLR04 Interrupts OCR A’LEVEL SLR04 Scheduling OCR A’LEVEL SLR04 Types of operating system OCR A’LEVEL SLR04 BIOS OCR A’LEVEL SLR04 Device drivers OCR A’LEVEL SLR04 Virtual machines Also in this topic... SLR02 – Types of processor (AS & A’Level) SLR14 – Data structures (AS & A’Level) SLR15 – Boolean algebra (AS & A’Level) SLR 23 – Programming Techniques (AS & A’Level) SLR 24 – Computational methods (A’Level Only)