Based on the available information, the Computer Science curriculum for Grade 9 in Saudi Arabia likely covers fundamental concepts of computer science. A syllabus outline from the Advanced International School of Riyadh ( suggests the following topics are covered:

• Binary Systems: Use of binary in computer systems, conversion between denary and binary, measurement of computer memory size.
• Hexadecimal System: Conversion between binary and hexadecimal, and between denary and hexadecimal; use in memory dumps, HTML, MAC addresses, and assembly/machine code.
• Data Storage: File formats (MIDI, MP3, MP4, JPEG, text, and number), lossless and lossy file compression.
• Communication and Internet Technologies: Data transmission (simplex, half-duplex, full-duplex, serial, parallel, asynchronous, synchronous), USB, error checking methods (parity checking, ARQ, checksum, echo check).
• Security Aspects: Security and data integrity, hacking and cracking, viruses, phishing, pharming, war driving, spyware/keylogging, cookies.
• Internet Principles of Operations: Internet technologies, internet service providers (ISPs), IP addresses and MAC addresses, HTML structure and presentation, HTTP and HTTPS, web browsers.
• Hardware and Software: Logic gates (NOT, AND, OR, NAND, NOR, XOR), truth tables, logic notation and Boolean algebra, logic circuits.
• Computer Architecture and Fetch-Execution Cycle: Computer architecture, memory unit, processor, control unit, input/output devices, the fetch-execution cycle.

This outline provides a general overview of topics, but it lacks specific details about the curriculum's learning objectives, assessment methods, and resources. Additional information from the Ministry of Education or other official sources would be needed for a more comprehensive understanding of the Grade 9 Computer Science syllabus in Saudi Arabia.