Computer Fundamentals and Hardware
Computer Fundamentals and Hardware is the domain that asks you to identify what a computer is made of, how data moves between parts, and how memory and ports are measured. UPMSP questions typically use block diagrams, device classification and capacity conversion rather than deep electronics.
Core rules
- A computer follows input → process → output → storage. The CPU is the processing unit; it contains the ALU (arithmetic and logic), the control unit (directs operations) and registers (very fast temporary storage).
- Primary memory is directly accessed by the CPU. RAM is volatile and holds programs/data in use; ROM is non-volatile and stores firmware such as start-up instructions.
- Secondary storage (HDD, SSD, pen drive, DVD) is non-volatile but slower. Cache is small, fast memory between CPU and RAM.
- Capacity: 8 bits = 1 byte; 1 KB = 1024 bytes; 1 MB = 1024 KB; 1 GB = 1024 MB. Input devices send data in (keyboard, mouse, scanner, microphone); output devices send data out (monitor, printer, speaker). A touchscreen is both.
Worked example
A system has 2 GB RAM. Convert to MB, then to bytes. Reasoning: 1 GB = 1024 MB, so 2 GB = 2 × 1024 = 2048 MB. 1 MB = 1024 × 1024 bytes = 1,048,576 bytes; 2048 MB = 2048 × 1,048,576 = 2,147,483,648 bytes. The exam usually accepts 2048 MB and 2^31 bytes.
Traps that cost marks
- Calling RAM permanent storage. RAM loses contents on power-off.
- Using 1000 instead of 1024 for KB/MB/GB in exam conversion questions.
- Treating a pen drive as primary memory; it is secondary.
- Mixing CPU parts: the ALU calculates, the control unit coordinates; neither stores the operating system permanently.
- Labelling a touchscreen only as output.