Memory models, FAT, interrupts, and the open-source continuation of the original PC OS.
How DOS power users reclaimed precious conventional memory by relocating device drivers and resident programs into unused gaps in the upper memory area, and why that space wasn't uniform across different machines.
Why DOS ended up with three separate, incompatible ways to access memory beyond the conventional 640K barrier, and what each one was actually solving.
Long filenames show up truncated to 8.3 format in some programs but not others, even with DOSLFN loaded. This is expected, driver-specific behavior — here's how to tell which programs actually support it.
FreeDOS boots with the wrong date or time every session, or DATE/TIME commands don't stick. Here's how to distinguish a dying CMOS battery from a software configuration issue.
FreeDOS reached its first stable 1.0 release on September 3, 2006 — twelve years after Jim Hall's original 1994 call to build a free DOS.
FreeDOS 1.3 shipped February 20, 2022, continuing the project's roughly five-year major release rhythm with an updated package set.
A practical tour of FreeDOS batch scripting: variables, control flow, argument handling, and the quirks that differ from a modern shell.
How a FreeDOS machine goes from the boot sector to a command prompt, and how CONFIG.SYS and AUTOEXEC.BAT configure everything along the way.
How character and block device drivers register with the DOS kernel through a standard request-header protocol, loaded declaratively from CONFIG.SYS.
How the File Allocation Table represents files as linked chains of clusters, and why that simple design has both strengths and hard limits.