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This web page examines input/output instructions in assembly language. Specific examples of instructions from various processors are used to illustrate the general nature of assembly language.
free computer programming text book projectIf you like the idea of this project, |
Now building a For those with high speed connections, the very large single file summary is still on line.
Input/Output (I/O) instructions are used to input data from peripherals, output data to peripherals, or read/write input/output controls. Early computers used special hardware to handle I/O devices. The trend in modern computers is to map I/O devices in memory, allowing the direct use of any instruction that operates on memory for handling I/O.
Information on the devices for the hypothetical MIX processor’s input/output instructions.
| unit number | peripheral | block size | control |
|---|---|---|---|
| t | Tape unit no. i (0  i 7) | 100 words | M=0, tape rewound; M < 0, skip back M records; M > 0, skip forward M records |
| d | Disk or drum unit no. d (8 d 15) | 100 words | position device according to X-register (extension) |
| 16 | Card reader | 16 words | |
| 17 | Card punch | 16 words | |
| 18 | Printer | 24 words | IOC 0(18) skips printer to top of following page |
| 19 | Typewriter and paper tape | 14 words | paper tape reader: rewind tape |
Now building a For those with high speed connections, the very large single file summary is still on line.
Programming example: I am making heavily documented and explained open source PHP/MySQL code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming). Includes how to run this from your own computer if you don’t have a web site.
OSdata.com is used in more than 300 colleges and universities around the worldfree downloadable college text book on computer programming. |
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Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.
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A web site on dozens of operating systems simply can’t be maintained by one person. This is a cooperative effort. If you spot an error in fact, grammar, syntax, or spelling, or a broken link, or have additional information, commentary, or constructive criticism, please e-mail Milo. If you have any extra copies of docs, manuals, or other materials that can assist in accuracy and completeness, please send them to Milo, PO Box 1361, Tustin, CA, USA, 92781.
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free computer programming text book projectBuilding a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming. If you like the idea of this project, Supporting the entire project: If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church) free downloadable college text book on computer programming. |
I do the news as an unpaid volunteer for KOCI 101.5 FM, Newport Beach/Costa Mesa (also available on the web)
This web site handcrafted on Macintosh 
computers using Tom Bender’s Tex-Edit Plus 
and served using FreeBSD 
.
Names and logos of various OSs are trademarks of their respective owners.
Copyright © 2000, 2001 Milo
Created: February 21, 2001 (from machcode.htm)
Last Updated: February 21, 2001
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