ClassicOS

An x86 Operating System for 386, 486, Pentium class (P-75, 100, Pentium II, P3, P4, etc) CPU's

Tooling

These are the versions I use, but please use the latest possible versions.

• NASM version 2.14
• QEMU x86_64
• GNU ld (GNU Binutils for Debian) 2.31.1 or newer
• dd (coreutils) 8.30
• as (GNU Binutils for Debian) 2.31.1 or newer
• ld (GNU Binutils for Debian) 2.31.1 or newer
• cc (Debian 8.3.0-6) 8.3.0

The C and C++ standards we are using for this are C17 and C++20

For C/C++:

• clang version 7.0.1-8+deb10u2 (tags/RELEASE_701/final)
• gcc version 8.3.0 (Debian 8.3.0-6)
• g++ version 8.3.0 (Debian 8.3.0-6)
• GNU gdb (Debian 8.2.1-2+b3) 8.2.1
• lldb version 7.0.1
• Coreutils 8.30
• Binutils 2.31.1
• Bison 3.3.2
• Diffutils 3.7
• Findutils 4.6.0.225
• Gawk 4.2.1
• Grep 3.3
• Gzip 1.9
• M4 1.4.18
• Make 4.2.1
• Patch 2.7.6
• Perl 5.28.1
• Python 3.7.3
• Sed 4.7
• Tar 1.30
• Texinfo 6.5, Xz 5.2.4

Features

• Booting from 1.2M, 1.44MB, hard drive or ISO9660
• FAT12, FAT16, FAT32, NTFS and ext2 support
• GUI