Chapter 2

1. I/O structure

1.1. Synchronous I/O Structure

1.1.1. Control return to user upon I/O completion

1.2. Asynchronous I/O Structure

1.2.1. Control can return to user waiting for I/O completion

1.2.2. System call

1.2.3. Device status table

2. Interrupt handling

2.1. Program counter

2.2. Interrupt vector table

2.2.1. Startling address of IRS of the interrupting device

2.3. Once complete

2.3.1. INT refreshed