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Supported platforms

Intel and AMD x86 processors in 32-bit mode. The baseline is the 80486, also known as i486. (Debian's baseline is now the Pentium 1.)

Floating-point architecture: x87. (SSE2 not available in Debian's baseline.)

Operating systems: Linux, BSD, MacOS X, MS Windows.

Debian architecture name: i386

Reference documents

Instruction set architecture: any Intel or AMD manual of the last 20 years.
ELF application binary interface: System V Application Binary Interface, Intel386 Architecture Processor Supplement
MacOS X application binary interface: OS X ABI Function Call Guide: IA-32 Function Calling Conventions