Operating systems, infrastructure, emulation, and technical history.
Building a batch-file boot menu that manages memory-hungry TSRs — loading only what a chosen task needs, freeing conventional memory for everything else.
Configuring the USBASPI/ASPIDISK driver chain to give FreeDOS a working drive letter for a USB flash drive, bridging DOS-era drivers to a newer standard.
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.
Microsoft's archived table records December 31, 2001 as DOS support retirement, but its surviving row names MS-DOS 6.0 rather than 6.22.
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.
How DOS users reclaimed conventional memory by relocating drivers and TSRs into unused upper memory gaps, which varied by machine and BIOS.
Why DOS ended up with three separate, incompatible ways to access memory beyond the conventional 640K barrier, and what each one was actually solving.
How to design a FreeBSD service around Capsicum descriptor rights, capability mode, process descriptors, and delegated Casper services.