Inside Atari DOS
A review of the 1980s book 'Inside Atari DOS' by Bill Wilkinson, which documented the Atari Disk Operating System through detailed explanations and commented assembly source code. The book covered DOS routines, commands, and the complete DOS 2.0S source listing.
Atari DOS split into two components: FMS (DOS.SYS) for file management and DUP.SYS for the menu system, managing 720-sector disks with 128-byte sectors (90K total). The system used a VTOC for sector tracking and stored file directories in sectors 361-368, with various DOS versions maintaining backward compatibility through the same disk format.
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