Memory models, FAT, interrupts, and the open-source continuation of the original PC OS.
How FreeDOS NANSI interprets console escape sequences, colors, cursor controls and optional key redefinition, plus loading, testing, and safety boundaries.
How COUNTRY, KEYB, DISPLAY, MODE and CHCP coordinate FreeDOS locale data, keyboard input and screen glyphs without confusing bytes with Unicode.
How DPMI hosts give DOS applications selectors, linear memory, real-mode callbacks, interrupts, exceptions, and virtual memory without replacing DOS.
How FreeDOS reads and writes FAT32 volumes, including BPB fields, 28-bit cluster chains, root-directory changes, FSInfo hints, size limits, and repair.
A diagnostic path for missing DPMI hosts, linear-memory exhaustion, page faults, invalid selectors, swap files, extenders, TSR conflicts, and bad RAM.
How to distinguish absent media from an exhausted DOS CDS table, audit block drivers and redirectors, set LASTDRIVE safely, and reclaim memory.
A reversible CuteMouse setup covering PS/2, serial and BIOS USB paths, TSR detection, high loading, exit codes, compatibility testing, and rollback.
A write-minimized preservation workflow for floppy and hard-disk media using stable identity, raw images, checksums, read logs, and duplicate-image tests.
An isolated Windows 3.1 compatibility test on FreeDOS covering legal media, kernel support, modes, memory managers, drivers, backups, and rollback.
How DOS packet drivers expose Ethernet classes, receiver callbacks, send operations, handles, interrupt vectors, and hardware-specific configuration.