Atari 800 ROM OS Source Listing
Atari Personal Computer System-Operating System-User's Manual-January 1982-CO16555 ; size: 67 MB, 280 pages
Atari 400-800 Technical Reference Notes-Operating System User's Manual-Operating System Source Listing and Hardware Manual ; size: 21.6 MB, 553 pages
FAST FLOATING POINT source code for the ATARI
Atari 800-XL-XE System Label Listing