Friday, May 14, 2021

Week of May 17th - 21st, 2021

Monday:
Personal day for Mr. J.
Students who have completed problems in 5.4 and 5.5 can work on Machine Learning paper, due May 27th at 7:30 AM.
Here is a list of stuff you should know for the quiz tomorrow.
Here is the reference sheet for Unit 5. Paper copies were given to Cohorts A and B.  You can refer to it while taking the quiz.
Tuesday:
Unit 5.4 and 5.5 due at 7:30 AM
Quiz on Unit 5
Cohort A students can take a look at a computer motherboard after the quiz.

Wednesday:
Remember that the Machine Learning paper is due on Thursday, May 27th, at 7:30 AM.  Also remember that it was assigned about a month ago. . . don't wait, chip away at it now, and make yours one that you will be proud of.  This might provide some inspiration. (13:56)

Cohort B students can take a look at a computer motherboard while watching the videos,

Overview of computer history:
Early Computing: Crash Course Computer Science #1 (11:52) Overview of computing up until the early 1900s
The greatest machine that never was (12:14) Babbage, Lovelace, and Turing
Charles Babbage and his Difference Engine #2 (5:47) shows the Difference Engine #2 in action

Thursday:
More computer history:
Electronic Computing: Crash Course Computer Science #2 (10:43) From about 1900 to the beginning of the transistor era
The Queen of Code (16:30) Grace Hopper was a serious badass.
ENIAC (0:38)
SAGE (just watch up to 6:55, the stuff after that is fairly irrelevant)

Friday:
How Computers Work:
Now we've learned a little about the early days of computing, from the abacus and Charles Babbage's analytical engine to the WW2 era Mark-I and ENIAC, and the gigantic SAGE computers built using vacuum tubes.  How do you get from that to a smartphone in your pocket?  The answer is the transistor, and the integrated circuit that combines millions or billions of transistors into a smallish chip.  Here is a circuit board that has several chips on it -- those black square things:


Grind the top off one of those chips and it looks like this:

Take a closer look at the little square in the middle with the tiny wires:

Zoom in:

Zoom in more with an electron microscope (not the same chip as above):



So, how do you make something like this?  It's built up in many layers using a very complex technique called photolithograpy.  This gives a pretty good picture:
Integrated Circuits and Moore's Law: Crash Course in Computer Science (12:40 + promo at the end)
How do they make silicon wafers and computer chips? (8:53)
50 Years of Moore's Law (2:03)
Zoom into a microchip (3:40)
Zoom in on the chip in your cell phone  (0:32)

So, how does all this actually work?  Let me try to explain . . .
Here is a copy of the slides I'll be going through (updated).
Demo the Visible Computer.

Begin CMU Unit 7 in remaining time.