| Directory > Computers > Software > Operating Systems > x86 PizziOS
One-user, segmented memory OS, written in pure x86 Assembly but may get some C, memory protection
via segmentation, FAT-16/32. Main goals: small, fast. Will not be a Unix, but will use block
shifting memory management scheme used in some old Unix. Downloads.
http://www.patmedia.net/eaj.pizzi/pizzios/
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HanoiOS
Self booting x86 OS implementation of Towers of Hanoi puzzle, very simple bootstrap loader and
kernel; boots, presents shell-like prompt for valid integer input, used by kernel as count of disks
to solve, prints list of moves.
http://www.kernelthread.com/hanoi/html/tos-x86.html
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FlashOS
Simple OS for x86 CPUs. First designed by Kenneth Garin who still directs and designs project and
allows help by others to develop it into a working system. Goal: create whole OS like DOS, with our
own ideas of how OS should work: not another clone. [Open Source, GPL]
http://www.gskinner.com/assets/0era/
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ScottsNewOS
Runs on i386+ compatible, working GUI even on 4 MB. Coded in Assembly, C. Brief description,
download link. [Open Source, GPL]
http://scottsnewos.sourceforge.net/
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Degenerate OS
Fits in boot sector, minimal debug-like interface from which you can do much with much effort, few
commands, all values in hexadecimal, case and white space sensitive. One all-text page with
description, assembly listing. [Open Source, GPL]
http://angelfire.com/folk/sm0p/nap.asm.txt
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Hactar
Claims: all new, no equivalent design in extant OSs, an adventure into something really different,
an answer to a What if? Runs on 386+, system disk is floppy, kernel size 32Kb; manages 4Gb RAM, 2Gb
disk; semi-multitasking; unusual interface. [Open Source, WTOF PL]
http://anywherebb.com/hactar.html
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Synapse Operating Services
Protected mode, multitasking support, 32-bit; developed on x86-32, intended to run on x86-64 with
some changes; DOS-like, but not fully compatible, use: to run ported DOS programs up to 512K. At
SourceForge. [Open Source, BSD]
http://sourceforge.net/projects/comos/
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TriangleOS
32-bit multitasking, multithreaded OS for x86 386+ CPUs, with GUI, FSs, applications, drivers, all
in active development. Site has information, news, documents, screenshots, downloadable releases.
http://members.chello.nl/w.cools/
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XAOS
Runs on i386+, 16-bit real mode, FAT12/16/32 (read-only, LFN support), coded in C++; downloads:
binaries, source, utilities, game (tetris source); downloads. [Open Source]
http://www.mirzoyan.com/xaos/
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ShellOS
Development of a 32-bit, monolithic kernal with preemptive, prioritized multitasking.
http://www16.brinkster.com/shellos/
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SuperDOS
Multitasking, multiuser business OS; small (100K), integrated file system, low maintenance. Main
purpose: fast business online transaction processing. Usually used in vertical markets such as
transportation. Not a (unrelated to) DOS variant. By Bluebird Systems.
http://www.bluebird.com/SuperDOS.htm
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Download Operating System: LSD
By LadSoft; developed years ago and improved since then; planed for redesign to make a viable OS;
updates soon. Extant version is good sample of programming standard PC hardware (no PCI) and
managing x86 pmode resources. [Copyrighted Freeware]
http://www.members.tripod.com/~ladsoft/frindx.htm?pmode.htm
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BoxOS
Connects many open source projects together in one neat package; kernel, boot loader, graphical
user interface, console user interface, applications, programming languages, drivers, file system
support for BeOS, Linux, Windows 95/98/NT. [Open Source, GNU]
http://boxos.sourceforge.net/
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Visopsys
VISual OPerating SYStem: small, fast, home-brewed, open source, 32-bit, true preemptive
multitasking OS kernel for x86, runs in 32-bit mode, virtual memory. Also links, and free code bits
for developers, on various pages. [Open Source, GPL]
http://www.visopsys.org/
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Domainatrix
Assembly language OS for Intel/AMD x86 architecture made specifically for serving the Web, written
originally for the programmer's personal interest and education after moving to the PC platform
from his old 8-bit machine. Philosophically similar to V2 OS.
http://domainatrix.freeservers.com/
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RDOS
Multi-process/threaded protected mode OS for all i386+ systems, written in all 16-/32-bit Assembly
in TASM, fully PROMable so can port to embedded systems with no keyboard and/or screen, stable and
secure via segment protection and paging. [Open Source, GPL]
http://www.rdos.net/
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Plex86.org
Was FreeMWare. Extensible PC virtualization program to allow running multiple OSs at once on one
processor. Runs as much OS and application software natively as possible, the rest emulated by PC
virtualization monitor. [Open Source, LGPL]
http://www.plex86.org/
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The Mobius
OS for IA32 processors (i486 and up, and compatible), 32-bit graphical monolithic kernel, modular
device drivers and GUI. Supports GCC (Cygwin), Visual C++, Unicode throughout; plans for many GNU
tools are underway. [Open Source]
http://www.themoebius.org.uk/
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SkyOS
Open-source, full featured graphical (GUI) 32-bit operating system for x86 386+ architecture;
network and Sound Blaster support, mice, video, and many file systems. Website shows requirements,
screenshots, status, downloads, documentation, contacts, members, forum, mail list.
http://www.skyos.org/
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PM_SZ_OS
Protected mode, 32-bit OS for i486 CPUs and up, full network stack, supports several filesystems,
paging, deferred procedure call support, and virtual multiple screens with different resolution and
scrollback. Free download.
http://www.geocities.com/the_real_sz/
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ReWin
Rewriting Windows: new OS now being designed for computers with Intel (or compatible) i386, i.e.,
with multitasking functions built into the processor. Will be Windows compatible, but won't be a
Windows clone: will give Windows executables the needed API so they can run correctly.
English/Italiano.
http://rewin.sourceforge.net/
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The Mobius: SourceForge
A few screenshots, details, links.
http://mobius.sourceforge.net/
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