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#int13

2 posts

FreeDOSDeep Dive October 3, 2026 7 min read

BIOS Fixed-Disk Parameter Tables: INT 41h, INT 46h, and Legacy Geometry

Read legacy fixed-disk parameter vectors safely, distinguish XT and AT table layouts, and avoid confusing BIOS geometry with partitions or modern drives.

#freedos#dos#bios

FreeDOSDeep Dive October 2, 2026 4 min read

FreeDOS and BIOS INT 13h: CHS, LBA Extensions, and Safe Disk Access

Understand legacy BIOS disk calls, probe Enhanced Disk Drive support, distinguish BIOS drive IDs from DOS letters, and avoid filesystem corruption.

#freedos#bios#int13