Here’s the Deal
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When comparing YASM vs NASM, the Slant community recommends NASM for most people. In the question“What are the best x86/x64 assemblers?” NASM is ranked 1st while YASM is ranked 4th.
Specs
No specs yet!
PlatformsWindows, DOS, Linux, Unix, OS/2
Ranked in these QuestionsQuestion Ranking
Common Questions
Pros
Pro Supports both AT&T and Intel syntax
Pro Modular
Pro Clean syntax
Pro Powerful macros
It can do everything GAS+CPP can do combined, and much more.
Pro Excellent for toy DOS code
NASM can easily create .COM executables and is even supported on DOS.
Cons
Con Lacks relocatable object module format
Con Poor diagnostics
NASM typically won't tell you the problem, just generic parser errors like "mismatched operand type" or "expected instruction".