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Results tagged with x86
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user 15334
The Intel x86 family of architectures in general. Contemporary systems are OFF-TOPIC! Use the specific architecture’s tag if applicable.
21
votes
Accepted
Difference between INT 0x20 and INT 0x21 (0x4C)?
The difference is that the latter appeared in DOS 2.0.
MS-DOS 1.x was pretty much a rebranded version of Seattle Computer Products’ 86-DOS (initially named QDOS), which in turn was heavily inspired by …
- 25.2k
13
votes
Accepted
Did Intel syntax for x86 assembly come from an Intel assembler?
However, for all I know the term ‘Intel syntax’ did not exist until its referent had to be contrasted with the AT&T syntax, and that is what the term is primarily used for in practice: it just means ‘x86 …
- 25.2k
16
votes
Accepted
Why did x86 support self-modifying code in the 80s and 90s?
However, x86 has no instruction that allows calling an interrupt whose number is stored in a register or memory operand. …
- 25.2k
30
votes
Why can't I invoke the next interrupt service by incrementing the AX register after calling ...
The comparison to syscalls is not a mere metaphor, as software interrupts have in fact been used as a syscall mechanism on a number of x86 operating systems: interrupt 0x80 in Linux, interrupt 0x21 in …
- 25.2k