Computer Science 330
Operating Systems

Fall 2025, Siena University

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Agenda

• Announcements
  • The next readings/activities from OS zyBook
    • Chapter 14, Section 4, due Monday, November 3
    • Chapter 16, Sections 1-3, due Friday, November 7
  • Lab 6: Unix Systems Programming [HTML] [PDF] due Monday, complete before you work on forking in the project
• Programming Project 4: Basic Shell [HTML] [PDF]
  • create repositories so we can set up groups, start making progress
  • reference solution executables on noreaster in /home/cs330/basicshell
  • Q&A time
• Memory management on the Commodore 64
• Looking at almost all of the exercises from OS zyBook Chapter 14, Sections 1-3
  • 14.1.1, 14.1.2, 14.1.3, 14.1.4, 14.1.5, 14.1.6
  • 14.2.1, 14.2.3, 14.2.4, 14.2.5, 14.2.6, 14.2.7
  • 14.3.1, 14.3.2, 14.3.3, 14.3.4
• Any remaining time for labs/projects

Terminology

• physical memory (RAM)
• physical address
• logical address space
• logical address
• source module
• object module
• load module
• static vs. dynamic relocation
• relocation register
• free-space management: first-fit, next-fit, best-fit, worst-fit
• external memory fragmentation
• swapping
• memory compaction
• linking
• sharing (of dynamic modules)
• paging
• page, page frame
• page table
• internal fragmentation