Computer Systems and Organisation — Class 11 CBSE Computer Science revision notes
A 4-page visual revision sheet for Computer Systems and Organisation, written for Class 11 CBSE Computer Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
What this Computer Systems and Organisation sheet covers
- The four-part model
- One instruction, start to finish
- Input
- CPU
- Output
- Inside the CPU
- ALU
- Control unit
- Registers
- System software vs Application software
- System software
- Application software
- Compiler vs Interpreter
- Compiler
- Interpreter
- Memory hierarchy, closer costs more
- Memory and storage units, the 1024 rule
- 1 byte
- 1 KB
- 1 MB
- 1 GB
- 1 TB
- Primary vs Secondary memory
- Primary (RAM, ROM, cache)
- Secondary (HDD, SSD, pen drive)
- Terms that show up as one-liners
- Boolean operators, quick truth
- AND
- OR
- NOT
- De Morgan's laws
- NOT (A AND B)
- NOT (A OR B)
- Boolean expressions, built the same way as arithmetic ones
- Number systems: the four bases
- 25 to binary, repeated division by 2
- Hex and octal, grouped straight from binary
- 25 as binary, padded
- grouped in 4s, hex digit each
- grouped in 3s, octal digit each
- Two's complement, how negatives actually sit in memory
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Computer Science chapter by chapter against your real exam dates and free hours, and when the plan reaches Computer Systems and Organisation the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.