IBM history

1890  Herman Hollerith invented  


census machine

[http://en.wikipedia.org/wiki/File:CTR_census_machine.JPG 22/05/2012 ]

1894   Herman Hollerith founded the tabulating machine 
 








merge to   Computing-Tabulating-Recording                       










[http://upload.wikimedia.org/wikipedia/en/a/a5/CTR_Company_Logo.png  22/05/2012]
1911 Herman Hollerith developed a horizontal sorter

 
to sorter 275  card/minute



1924  IBM


1937    Professor HOWARD HATHAWAY AIKEN
Professor of Applied Mathematics and Director of the Computation Laboratory, Harvard University.

he founded automatic sequence controlled counter



1944  Automatic Sequence Controlled Counter  became  Harvard Mark I
 
(Detail of Input/Output and control)


[http://en.wikipedia.org/wiki/Harvard_Mark_I  22/05/2012]



it handled 23-decimal-place numbers (words) and could perform all four arithmetic operations; moreover, it had special built-in programs, or subroutines, to handle logarithms and trigonometric functions. it was originally controlled from pre-punched paper tape without provision for reversal, so that automatic "transfer of control" instructions could not be programmed. Output was by card punch and electric typewriter.rotating counter wheels as key components in addition to electromagnetic relays, the machine was classified as a relay computer. It was slow, requiring 3 to 5 seconds for a multiplication, but it was fully automatic and could complete long computations without human intervention.

[http://www.eingang.org/Lecture/hmark1.html 22/05/2012]


1953  IBM 701

 

operator’s console

processor frame

Defense Calculator while in development, was announced to the public on April 29, 1952

[http://en.wikipedia.org/wiki/IBM_701  22/05/2012]

1954   IBM 650 





[http://en.wikipedia.org/wiki/IBM_650 22/05/2012]



Type 650 Power Supply            (left)
Type 650 Console Unit              (middle)
Type 533 Read-Punch Unit       (right)


[http://www.columbia.edu/cu/computinghistory/650.html  22/05/2012]


magetic drum
storage device
2 k word consist of 10 digits + sign



1959  IBM  7030  is a minicomputer as the second generation computer.   <<<<< where is the photo
?

1962  IBM  7090 is a vacuum tube as the second generation computer 

[http://upload.wikimedia.org/wikipedia/commons/b/b9/NASAComputerRoom7090.NARA.jpg]