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COM SCI 33 · CS 33Introduction to Computer Organization

Computer Science · 5 units · Undergraduate lower division (0-99)

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Introductory course on computer architecture, assembly language, and operating systems fundamentals. Number systems, machine language, and assembly language. Procedure calls, stacks, interrupts, and traps. Assemblers, linkers, and loaders. Operating systems concepts: processes and process management, input/output (I/O) programming, memory management, file systems.

Letter grading.

When it runs

Checking the Schedule of Classes…

Requisites

Official UCLA wording

Enforced requisite: course 32.

BruinTree reads · Prerequisite

confidence 1.00 · from text
COM SCI 32

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Requires

Everything that has to come before this course, not just the courses named in the requisite above.

COM SCI 33

  • COM SCI 32Introduction to Computer Science II
    • COM SCI 31Introduction to Computer Science I

1 direct requisite. The whole upstream is here — 2 courses over 2 levels. Every course here opens its own tree.

Unlocks

What this course is a requisite for, and what those courses lead to in turn.

COM SCI 33

  • COM SCI 111Operating Systems Principles2 more beyond
    • COM SCI 112Modeling Uncertainty in Information Systems
      • COM SCI 212AQueueing Systems Theory
      • COM SCI 218Advanced Computer Networks
      • COM SCI 246Web Information Management
      • COM SCI 262ALearning and Reasoning with Bayesian Networks2 more beyond
    • COM SCI 118Computer Network Fundamentals1 more beyond
      • COM SCI M119Fundamentals of Embedded Networked Systemsanother path to it
      • COM SCI 134Distributed Systems
      • EC ENGR M119Fundamentals of Embedded Networked Systemsanother path to it
      • COM SCI 136Introduction to Computer Security
      • COM SCI 211Network Protocol and Systems Software Design for Wireless and Mobile1 more beyond
      • COM SCI 215Internet of Things: Connectivity and Sensing
      • COM SCI 217AInternet Architecture and Protocols1 more beyond
      • COM SCI 218Advanced Computer Networksanother path to it
    • EC ENGR M117Computer System Securityanother path to it
    • COM SCI 130Software Engineeringanother path to it
    • COM SCI M138Computer System Securityanother path to it
    • COM SCI 144Web Applications
    • COM SCI M213AEmbedded Systems
    • COM SCI 214Big Data Systems
  • COM SCI M119Fundamentals of Embedded Networked Systems
  • EC ENGR M116CComputer Systems Architecture
    • COM SCI 152BDigital Design Project Laboratory
    • EC ENGR 201CArtificial Intelligence on Chip
  • COM SCI 131Programming Languages
    • COM SCI 130Software Engineering
      • COM SCI 263ALanguage and Thoughtanother path to it
      • COM SCI 263CAnimats-Based Modeling
    • COM SCI 132Compiler Construction
      • COM SCI 232Static Program Analysis
    • COM SCI 133Parallel and Distributed Computinganother path to it
    • COM SCI C137APrototyping Programming Languages
      • COM SCI C137BProgramming Language Design
    • COM SCI 231Types and Programming Languages
    • COM SCI 233AParallel Programming
      • COM SCI 233BVerification of Concurrent Programs
    • COM SCI C237APrototyping Programming Languages
      • COM SCI C237BProgramming Language Design
    • COM SCI 263ALanguage and Thought
      • COM SCI 265AMachine Learning
  • COM SCI M138Computer System Security
  • EC ENGR M117Computer System Security
  • COM SCI M151BComputer Systems Architecture
    • COM SCI 133Parallel and Distributed Computing
    • COM SCI 152BDigital Design Project Laboratoryanother path to it
    • COM SCI 251AAdvanced Computer Architecture
      • COM SCI 252AArithmetic Algorithms and Processors
    • COM SCI 251BParallel Computer Architectures
    • COM SCI 254AAdvanced Graphics Processing Unit Microarchitecture for Artificial Intelligence and Graphics Rendering
    • COM SCI 256AAdvanced Scalable Architectures
  • EC ENGR M119Fundamentals of Embedded Networked Systems
  • EC ENGR 202CInternet of Things Security

9 courses list this as a requisite. Showing 53 courses over 3 levels; the branches marked with a count carry on past it. Every course here opens its own tree.

  • Fall 2025
  • Winter 2026
  • Spring 2026
  • Fall 2026
  • Spring 2027

Scheduled, not typical — from UCLA’s Schedule of Classes, which publishes Fall 2025 through Spring 2027 and nothing before it.