Tech Timeline By Sarahchhs Mar 31, 1937 Model K Apr 1, 1941 Z3 Computer Apr 1, 1956 Direct Keyboard (Computer Imput) Apr 1, 1968 Apollo Guidence Computer Apr 1, 1973 HP-35 (Calculator) Apr 1, 1989 Intel's 80486 Microprocessor Apr 1, 1992 Powerbook Apr 1, 2008 Mac Book Air Apr 1, 2015 Apple Watch