Nomograph relating Computer in use, Birth date & Age (2002), Age at 1st use. Note two distinct groups of enthusiasts based on the machines each first used and identify with: Mainframe and mini users and pioneers that were introduced to machines in college & work. Personal computing starting in late 70s with use beginning early in the home and high school… a vastly larger number of user and use. Email, Web, and messenger may form a 3rd? Generation (birth) 82 72 62 52 42 32 22 12 2 20 30 40 50 60 70 80 90 00 00 10 20 30 40 50 Millenial Modern first use X (precocious very early user) 40 50 60 70 80 90 00 www PC Mini Mainframe Prototypes MAC, IBM PC, Sun Altair, Apple II, Pet, TRS, VAX, Baby B. PDP8, 360, 6600 7090, CDC birth Manchester ENIAC cgb Age at 1st use Computer Introduction Year Silent GI/Great ©Gordon Bell 27 Sept. 2002 Age (@02) Birth date

82 72 62 52 42 32 22 12 2 20 30 40 50 60 70 80 90 00 00 10 20 30 40 50 Millenial X 40 50 60 70 80 90 00 www PC Mini Mainframe Prototypes MAC, IBM PC Pet, Apple II Baby B. PDP8, 360, 6600 7090, CDC Manchester Age at 1st use Silent Computer Introduction Year GI/Great Age Birth date