h8
- questions?
- due tomorrow

q8
- due by midnight Thursday, over lessons 9-12

Attendance

Reading - lessons 13 and 14

q9
- lesson 13
- likely released before next class

Devices
- block versus character devices
- block - page / sector, caching (OS and drive controller)

Virtual memory
- basic idea, why - security between processes, simplicity of memory model, limited memory
- basic idea, how - page tables, page fault, ...
- picture and more details -
  https://en.wikipedia.org/wiki/Virtual_memory