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    <p>When you use the <code>int86</code> function call, that is a C runtime library call which sets up the registers and issues a DOS <code>int</code>errupt function. Both methods are really the same with one exception, when you use inline assembler, the code is actually embedded into the object code when compiled and linked.</p> <p>Inline assembly would be considered faster since you do not have the overhead involved in calling the C runtime library to invoke the DOS interrupt for you. The onus is on you to ensure there is enough stack space when using inline assembly, whereas the C Runtime library takes care of allocating stack space when setting up the registers prior to invoking the <code>int86</code> function.</p> <p>The <code>int86</code> is a way to make it easier to invoke DOS interrupts. This was extremely popular among the old Borland Turbo C suite of compilers and on Microsoft, I am talking about old compilers before Win 3.1 came out.</p> <p>Speaking of the interrupt 0x10, which is responsible for the video output, if I remember correctly, at the time, some BIOS's destroyed the <code>bp</code> register and the workaround was to do this:</p> <pre><code>__asm{ push bp; } /* set up the registers */ int86(0x10, &amp;regs, &amp;regs); __asm{ pop bp; } </code></pre> <p>You can find out the extensive BIOS functions on Ralph Brown's Interrupt List <a href="http://www.ctyme.com/rbrown.htm" rel="nofollow noreferrer">here</a>. Also HelpPC v2.1 may help also, found <a href="http://stanislavs.org/helppc/" rel="nofollow noreferrer">here</a>.</p>
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    1. POWhat is the difference between these two forms of inline assembler in C?
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    1. USEric Platon
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    1. POWhat is the difference between these two forms of inline assembler in C?
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    1. COI think I had a copy of Ralph Brown's interrupt list in college now that I think about it, and I have no idea what I did with it. Seems I forgot this awesome resource existed, thank you! This is very helpful.
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      1. USHeather M
    2. CO+1 for mentioning Ralph Brown's interrupt list and HelpPc
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      1. USNils Pipenbrinck
 

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