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(nasm.info)Section 2.2

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2.2. Quick Start for MASM Users
===============================

   If you're used to writing programs with MASM, or with TASM in MASM-
compatible (non-Ideal) mode, or with `a86', this section attempts to
outline the major differences between MASM's syntax and NASM's. If
you're not already used to MASM, it's probably worth skipping this
section.

Section 2.2.1

NASM Is Case-Sensitive

Section 2.2.2

NASM Requires Square Brackets For Memory References

Section 2.2.3

NASM Doesn't Store Variable Types

Section 2.2.4

NASM Doesn't `ASSUME'

Section 2.2.5

NASM Doesn't Support Memory Models

Section 2.2.6

Floating-Point Differences

Section 2.2.7

Other Differences