HP 09825-90060 9825A interf free download

File name 09825-90060_9825A_interf.pdf

Tai)ie of ContE~nts Reader's Guide ... " . . . . . . . . . . . .. 3 I. General Background Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. 4 A. The Task of an Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . .. 4 B. Software ... "... 5 1. Data. Representations in the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 2. Input/ Output Data Representations ... ". . . . . . . . . . . . .. 7 3. The Four Types of HP Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. 7 4. The Data Transfer Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . .. 9 C. Hardware ... , ... 10 1. Logic Levels and TTL Implementations ... ~ ... 10 2. Gates, Latches, and Flipflops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 12 3. The Use of Jumpers ... "... 15 II. Programming for Interfacing Operations ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17 A. Standard I/O Programming ... 17 1. Register Operational Model of an Interface ... 17 2. Select Codes ... 18 3. Direct Register Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18 4. Binary I/O Operations ... 19 5. Fomlatted I/O Operations ... 19 6. The Status and Control Registers ... 21 B. Interrupt I/O Programming ... 21 1. The Uses of Interrupt ... 21 2. Data Transfers with Slow Devices ... 22 3. Further Data Transfer Examples ... 24 4. Data Transfers with Fast Devices ... 26 5. User Programmed SelVice Routines ...