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 Post subject: How are shells created
PostPosted: Sat Feb 21, 2009 7:49 am 
8086
8086
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Joined: Sat Feb 21, 2009 5:54 am
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This is a question for old school programmers. I want to know how shells were created in the pre-dos and pre-c++ era. Like how were dos shells created. And another question, we communicate with the microprocessor via the external data bus, the proc contains a codebook which interprets our commands. What I want to know is this codebook an electrical circuitry or some virtual program.


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PostPosted: Sat Feb 21, 2009 10:06 am 
SON OF A GUN
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Joined: Mon Nov 01, 2004 5:41 am
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C came out several years before dos did. I am sure that shells have been written in much the same way for many years. Your question is way too broad.

To learn about shells and just system programming in general:
http://www.amazon.com/UNIX-Systems-Prog ... 0130424110

As far as the microprocessor stuff, again, your question is kind of generic.
http://www.amazon.com/Computer-Organiza ... 0130351199

The processor has some microcoded instructions that translates electric signals but it is far more complicated than that.

There are entire classes dedicated to the topics you are asking about.


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