Lecture Week 3.docx

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8 Feb 2013
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Test #1:
½ about programming & Dr.Racket
½ about the history and culture of computing.
*Look at the longer notes and the links.
Gears, Pins & Electricity:
All machines before this time period represented numbers by marks on clays,
beads…all things that can change and be captured by the human eye.
All machines before this time required a lot of human coordination.
There was a huge world event that the governments would spend money on
research against computers, this even was WW2. Computers would be useful
during war times by cracking codes and also for artillery- to see where the
projectiles would land.
Programmable or electronic:
Zuse Z1- German program
Information could be stored in something microscopic (The Atanosoff-
Berry); vacuum tubes.
When Computers were woman:
The smartest operators were woman, they were able to juggle many ideas in
their head…they had to connect various pins to other electronic pins
(programming) and their data was stored on paper.
You could count on 2 hands in the early 40’s the number of computers in the
world at this time. Computers at this time were very expensive, and easily
breakable. Once turned on, you would want it to stay turned on, and it was
cheaper for humans to run the wires then to come up with a program to do
this for them.
It was the size of approximately 12 dumpsters…very big!
Universes= models that respond to events
Ex: a watch
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