IBM
http://www-03.ibm.com/ibm/history/exhibits/pc/pc_1.html
Apple ii
http://oldcomputers.net/appleii.html
Altair
http://wwwcsif.cs.ucdavis.edu/~csclub/museum/items/mits_altair_8800.html
Cray
http://www.thocp.net/hardware/cray_1.htm
IBM
http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP2030.html
IBM http://www.ibm.com/developerworks/library/pa-microhist.html
Vacuum Tubes, transistors, Processors http://www.crews.org/curriculum/ex/compsci/articles/generations.htm
EDSAC http://www.thocp.net/hardware/edsac.htm
Schickard http://www.idsia.ch/~juergen/schickard.html
Zuse
http://www.idsia.ch/~juergen/zuse.html
http://www.codesandciphers.org.uk/lorenz/fish.htm
Turing
http://web.bvu.edu/faculty/schweller/Turing/Turing.html
Enigma
http://www.pbs.org/wgbh/nova/decoding/enigma.html
Atanasoff-Berry Computer
http://inventors.about.com/library/weekly/aa050898.htm?once=true&
Hollerith
http://www.columbia.edu/acis/history/hollerith.html
Babbage
http://www.computerhistory.org/babbage/engines/
Babbage
http://www.computerhistory.org/babbage/
Brunsviga
http://www.vintagecalculators.com/html/brunsviga.html
Arithmometer
http://www.britannica.com/EBchecked/topic/726021/Arithmometer
Leibniz
http://pkirs.utep.edu/mit5312/Additional%20Coverage/Tutorials/ISTypes/Early/leibniz_wheel.htm
Pascal
http://www.educalc.net/196488.page
Schickard
http://history-computer.com/MechanicalCalculators/Pioneers/Schickard.html
Slide Ruler
http://www.hpmuseum.org/sliderul.htm
Rabodologia
http://www.knowledgerush.com/kr/encyclopedia/Rabdologia/
Eniac
http://inventors.about.com/od/estartinventions/a/Eniac.htm
Astrolabes
http://www.astrolabes.org/
Heron of Alexandriahttp://www.mlahanas.de/Greeks/HeronAlexandria.htm
Analylzer
http://web.mit.edu/mindell/www/analyzer.htm
Planimeter
http://www.hpmuseum.org/planim.htm