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where can i find very old books about old operating systems like CP/M and DOS and other OS that worked on the 8086 ??

second question isn't old books 20 year before and older should have an expired patent ?? where in general can i find books of expired patents ...

thanx

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closed as off-topic by D.W., Juho, David Richerby, Raphael Jan 5 '15 at 8:46

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about computer science, within the scope defined in the help center." – Juho, David Richerby, Raphael
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Books are not patented: they are copyrighted. Copyright doesn't expire until 75 years after the death of the last author. $\endgroup$ – David Richerby Jan 4 '15 at 10:29
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it's perfectly possible to buy one on amazon: http://www.amazon.co.uk/CP-M-Handbook-Rodnay-Zaks/dp/0895880482/ref=sr_1_1?s=books&ie=UTF8&qid=1420360499&sr=1-1&keywords=cp%2Fm

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  • $\begingroup$ is this book about how the os works ? or is it about how to use it ? I want something explaining the internals. am a student but i want to learn os gradually not using today;s standard text it describes too complex os $\endgroup$ – Eng_Boody Jan 4 '15 at 15:34
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    $\begingroup$ perhaps you should look into minix instead; www.minix3.org $\endgroup$ – Dima Pasechnik Jan 4 '15 at 15:45
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PC Magazine Programmers Technical Reference: The Processor and Coprocessor by Rob Hummel and Microcomputer Architecture and Programming by John F. Wakerly are older books which go into detail about the 6800 family of cpus and their design. The PC Magazine one is more of a reference book though.

These books detail the CPU design and operand calls in machine code that the OS uses to control the computer. This would describe the underlying functionality of a computer, as an OS has many parts (even an old one) there is more than one topic or theory at play to allow an OS to exist.

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