!!!ATARI 8-Bit Operating System [Versions|OS Versions] [Differences between Versions|DiffOldOs2XL] [Atari 800 ROM OS Source Listing|Atari 800 ROM OS Source Listing] [Atari Personal Computer System-Operating System-User's Manual-January 1982-CO16555|http://data.atariwiki.org/DOC/Atari_Personal_Computer_System-Operating_System-User_s_Manual-January_1982-CO16555.pdf] ; size: 67 MB, 280 pages [Atari 400-800 Technical Reference Notes-Operating System User's Manual-Operating System Source Listing and Hardware Manual|http://data.atariwiki.org/DOC/Atari_400-800_Technical_Reference_Notes-Operating_System_User_s_Manual-Operating_System_Source_Listing_and_Hardware_Manual_553_pages.pdf] ; size: 21.6 MB, 553 pages [FAST FLOATING POINT source code for the ATARI|FAST FLOATING POINT source code for the ATARI] [Atari 800-XL-XE System Label Listing] [Atari System Labels from OSS|Atari System Labels from OSS] [Synapse Assembler Atari 800 OS Equates|Synapse Assembler Atari 800 OS Equates] [Copy OS ROM to RAM|Copy OS ROM to RAM] [OS Vectors for Action!|OS Vectors]