About the computer history museum’s ibm 1401 machines 1950's tax preparation: plugboard programming with an ibm 403 The heritage of
IBM plugboard | IBM 513, I believe. Not sure the purpose of … | Flickr
Bad relay: fixing the card reader for a vintage ibm 1401 mainframe
1950's tax preparation: plugboard programming with an ibm 403
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12-minute mandelbrot: fractals on a 50 year old ibm 1401 mainframe
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