An overview of the content of the 'historic' directory: doom01.zip pre-alpha screenshots (LBM/GIF) released on Mar 1, 1993 doom02.zip pre-alpha screenshots (LBM/GIF) released on Feb 4, 1993 doom03.zip pre-alpha screenshots (LBM/GIF) released on Mar 3, 1993 doom04.zip pre-alpha screenshots (LBM/GIF) released on Feb 15, 1993 doompix1.exe pre-alpha screenshots (LBM) released on Mar 1, 1993 doomscn5.zip pre-release screenshots (PCX) released on Oct 5, 1993 doom0_2.zip alpha version of DOOM released on Feb 4, 1993 doom0_4.zip alpha version of DOOM released on Apr 2, 1993 doom0_5.zip alpha version of DOOM released on May 22, 1993 doomprbt.zip press-release beta version of DOOM released on Oct 4, 1993 doom1_0.zip v0.99 shareware version of DOOM released on Dec 10, 1993 doom1_1.zip v1.1 shareware version of DOOM released on Dec 16, 1993 altdoom1.zip v1.1 alternate DOS extenders for DOOM released on Dec 15, 1993 doom1_2.zip v1.2 shareware version of DOOM released on Feb 17, 1994 doom14bt.zip v1.4beta shareware version of DOOM released on Jun 28, 1994 doom15bt.zip v1.5beta shareware version of DOOM released on Jul 8, 1994 doom16bt.zip v1.6beta shareware version of DOOM released on Aug 3, 1994 dm1666sw.zip v1.666 shareware version of DOOM released on Sep 1, 1994 doom_v18.zip v1.8 shareware version of DOOM released on Jan 23, 1995