FreeDOSHow-To 4 min read
How to Install FreeDOS From Scratch, Step by Step
Installing FreeDOS onto a virtual machine or real hardware, from booting the installer through to a working CONFIG.SYS and AUTOEXEC.BAT.
#howto#install#freedos
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FreeDOS posts
Memory models, FAT, interrupts, and the open-source continuation of the original PC OS.
FreeDOSHow-To 4 min read
How to Set Up Networking on FreeDOS with mTCP
Getting real TCP/IP networking working on FreeDOS using mTCP and a packet driver, enough for FTP, Telnet, and a basic text-based browser.
#howto#networking#mtcp
Read more FreeDOSDeep Dive 7 min read
Understanding Interrupts on FreeDOS: INT 21h and the DOS API
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.
#interrupts#dos-api#freedos
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FreeDOS Memory Management: Conventional, Upper, and Extended Memory
A source-backed guide to FreeDOS conventional memory, UMBs, the HMA, XMS and EMS, with safe Jemm and Himem configuration and troubleshooting practices.
#memory#freedos#dos
Read more FreeDOSNews 5 min read
FreeDOS 1.2 Arrives After Nearly Five Years
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.
#news#release#freedos
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Microsoft Open-Sources the Original MS-DOS on GitHub
On September 28, 2018, Microsoft placed MS-DOS 1.25 and 2.0 source and binaries on GitHub under MIT; MS-DOS 4.00 followed separately in April 2024.
#news#ms-dos#open-source
Read more FreeDOSDeep Dive 7 min read
FreeDOS Package Management: FDIMPLES and the FreeDOS Package Repository
A verified guide to FreeDOS ZIP packages, FDIMPLES, FDINST and FDNPKG, including real commands, metadata, local media, repositories, updates, and trust risks.
#package-management#freedos
Read more FreeDOSDeep Dive 8 min read
Running FreeDOS Today: Virtualization, Real Hardware, and Use Cases
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.
#freedos#virtualization#sysadmin
Read more FreeDOSDeep Dive 8 min read
TSR Programs: How DOS Ran Background Tasks Without Multitasking
A forensic guide to DOS TSR residency, interrupt hooks, chaining, INT 28h and InDOS reentrancy, multiplex IDs, memory ownership, safe unloading, and testing.
#tsr#freedos#dos
Read more FreeDOSDeep Dive 8 min read
FreeDOS vs. MS-DOS: Compatibility, Differences, and Why It Matters
A precise comparison of FreeDOS and MS-DOS across APIs, executables, kernels, shells, filesystems, hardware, licensing, undocumented behavior, and testing.
#freedos#ms-dos#compatibility
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