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29 posts
Installing a C compiler and assembler on FreeDOS and building your first program, for anyone wanting to write DOS software rather than just run it.
Getting sound, mouse, and memory configured correctly for DOS-era gaming — the three things almost every classic game setup guide assumes already work.
FreeDOS 1.1 arrived January 2, 2012 with kernel 2040, mTCP, initial UHCI USB support and UIDE, while its official notes documented installer limits.
FreeDOS 1.4 shipped April 5, 2025 with FreeCOM 0.86, FDISK and mTCP fixes, reorganized media, monthly-test-release input, and the proven 1.3 kernel.
FreeDOS marked 25 years on June 29, 2019 with Jim Hall's account of PD-DOS, early utilities, community-built FreeCOM and kernel work, and three stable releases.
Jim Hall's June 29, 1994 Usenet post proposed PD-DOS with a manifest and task list; contributors responded, and the GPL project became Free-DOS within weeks.
FreeDOS 1.0 arrived September 3, 2006 with installable base and full distributions, a boot floppy, package tools, source media, and a LiveCD option.
FreeDOS 1.3 arrived February 20, 2022 with kernel 2043, FreeCOM 0.85a, an 8086 FAT32 build, restored networking, compressed floppy media, and installer fixes.
A FreeCOM-specific guide to portable DOS batch files using arguments, SHIFT, IF, ERRORLEVEL, FOR, GOTO, CALL, redirection, and defensive expansion.
A forensic walkthrough of FreeDOS startup from BIOS, MBR and volume boot code through KERNEL.SYS, FDCONFIG.SYS, FreeCOM, FDAUTO.BAT, drivers, and recovery keys.
A source-backed tour of FreeDOS device headers, character and block drivers, request packets, entry points, INIT, status words, and loading risks.
A forensic guide to FreeDOS FAT12, FAT16 and FAT32 layout, cluster typing, directory and VFAT entries, allocation chains, mirrors, corruption, and recovery.
Diagnosing why a sound, network, or serial device fails or hangs the system when used alongside another — classic IRQ conflicts and how to resolve them.
SET commands or a long PATH suddenly fail with 'Out of environment space.' The environment block has a fixed size, and here's how to actually fix it.
You edited CONFIG.SYS, rebooted, and now the system hangs or won't load drivers correctly. Here's how to get back to a bootable state without reinstalling.
The single most common reason to boot FreeDOS today: building a bootable USB stick to run a vendor's DOS-based firmware update tool.
Getting a CD-ROM drive recognized and assigned a drive letter on FreeDOS through the driver-plus-MSCDEX layering DOS CD-ROM support was always built on.
Installing a text editor and a couple of common utilities on FreeDOS, and wiring them into your PATH and environment correctly.
Creating a primary partition, an extended partition with logical drives, and setting the active boot partition the way DOS disks have always been organized.
Installing FreeDOS onto a virtual machine or real hardware, from booting the installer through to a working CONFIG.SYS and AUTOEXEC.BAT.
Getting real TCP/IP networking working on FreeDOS using mTCP and a packet driver, enough for FTP, Telnet, and a basic text-based browser.
A register-level guide to the interrupt vector table, FreeDOS INT 21h dispatch, file and process calls, Carry Flag errors, BIOS services, TSR hooks, and reentrancy.
A source-backed guide to FreeDOS conventional memory, UMBs, the HMA, XMS and EMS, with safe Jemm and Himem configuration and troubleshooting practices.
FreeDOS 1.2 shipped December 25, 2016 with the new FDI installer, FDIMPLES package selection, multiple USB and CD images, and a much broader software catalog.
A verified guide to FreeDOS ZIP packages, FDIMPLES, FDINST and FDNPKG, including real commands, metadata, local media, repositories, updates, and trust risks.
A practical 2026 guide to running FreeDOS 1.4 in QEMU, virtual machines, emulators or real hardware, with verified boot, USB, firmware and network safety advice.
A forensic guide to DOS TSR residency, interrupt hooks, chaining, INT 28h and InDOS reentrancy, multiplex IDs, memory ownership, safe unloading, and testing.
A precise comparison of FreeDOS and MS-DOS across APIs, executables, kernels, shells, filesystems, hardware, licensing, undocumented behavior, and testing.
The history, goals, and real-world use cases behind FreeDOS, the open-source, actively-maintained continuation of the MS-DOS-compatible operating system line.