FreeDOS posts

Memory models, FAT, interrupts, and the open-source continuation of the original PC OS.

FreeDOSFix July 12, 2026 4 min read

Recovering a FreeDOS Boot Disk with a Damaged MBR

A non-destructive FreeDOS recovery sequence for imaging the disk, auditing partitions and active flags, repairing boot code, and verifying files.

#mbr#boot#recovery

FreeDOSFix July 12, 2026 3 min read

Fixing DOS Games That Run Too Fast on Modern Hardware

How to identify CPU-bound timing loops and choose throttling, cache, emulator-cycle, or period-correct hardware solutions without damaging the installation.

#games#timing#troubleshooting

FreeDOSFix July 12, 2026 3 min read

Diagnosing FAT Corruption on FreeDOS Without Making Recovery Worse

How to image first, distinguish media failure from filesystem damage, and use CHKDSK-style repair only after preserving evidence.

#fat#corruption#recovery

FreeDOSFix July 12, 2026 3 min read

Fixing HIMEM and EMM386 Conflicts in a FreeDOS Memory Configuration

Diagnose FreeDOS HIMEM and EMM386 conflicts with a controlled boot menu that isolates XMS, EMS, UMB, ROM exclusions, and driver order.

#himem#emm386#memory

FreeDOSFix July 12, 2026 3 min read

Fixing FreeDOS Keyboard Layout and Codepage Mismatches

Fix FreeDOS keyboard and codepage mismatches by separating scan-code mapping from display glyphs and aligning COUNTRY, KEYB, MODE, and fonts.

#keyboard#codepage#localization