Prelude to Computer Science - 8: Logic Circuits

[c013mcc4nn]

Your series so far is very helpful, simple to follow, and the segments cover just an appropriate amount of material, however try to work on how often you say, "uh," or "um." It's very distracting.

[TheFallibleFiend]

@MrDavidVuong

Attach A to NOR1 (input 1 on nor gate)

Attach B to NOR2

Attach A to ORx1

Attach B to ORx2

Attach output of NOR gate to ORy1

Attach output of ORx gate to ORy2

The output of the circuit is the output of ORy.

If you build it, let me know if it worked. I'm doing this in my head and I'm an old guy, but I think that's right.

[TheFallibleFiend]

@MrDavidVuong If I understand your problem, it's essentially ignoring the inputs and setting the output to 1.

So solution 1 is to just ignore the input and set the output to 1.

Solution 2 call the inputs A and B. Use three circuits two 2-input ORs and one 2-input NOR gate. NOR1 is input 1 on NOR gate. Call OR gates ORx and ORy.

The final value you want will be the output of ORy.

cont'd

[TheFallibleFiend]

@MrDavidVuong David, I don't do people's homework - and in this case, the question is vague. It sounds like you just split the high voltage (T). Draw a point with one line coming in from the left that is your input. Draw four lines coming out the right. Those are the outputs. Tie the left side to a high voltage (high voltage is true). You could buffer the outputs or send to LED. No idea what your prof might expect.

[kaled1024]

hi thx for these gr8 videos.

u mention that a CPU contains millions of Logic Circuits.. but as far as i know a CPU can only carry simple arithmetic operation etc. what is the function of all these millions of Logic Circuits in a CPU?

[TheFallibleFiend]

Each arithmetic circuit is actually a combination of logic circuits. This video shows, for example, how a logic circuit can be used to add 2 bits.

[kaled1024]

Thanks for the answer but my quistion is:

why should a CPU contain millions of logic circuits if we can make fx a simple adder with just a couple of them..

What is the function of so many logic circuits and transistors?

is it for the sake of speed ,maybe?

[TheFallibleFiend]

You can add one bit with a couple of them! You can carry a bit with a few more. But processors have to be able to hold lots of data and move it around - your processor even has its own memory, called cache. CPU requires logic to address internal and external memory, put data on the data bus, lock it into registers ... and many more functions besides just adding: multiply, divide, etc.

[KOOL2011]

Hello, I am a Sophomore at high school and i have no experience with programing computers. I want to be a software engineer,how hard would it be for me in college when i major in Computer Science.Thank you.

[TheFallibleFiend]

It depends on what your background is and how determined and interested you really are. If your HS offers a CS course and has a decent teacher, you should try to take it - that will give you a feel for it. Also, there are things you can do that will give you some experience programming - also, there might be a computer club in your area where you can get some experience with the subject. Finally, reading on the subject is a good way to pick things up. Good luck.

[KOOL2011]

What would be a better major as overall Bachelors in Computer Science Or Bachelors In Software Engineering? And with which degree are more jobs open?

[TheFallibleFiend]

A master's is the best bang for your buck. The exact major depends on what you're most interested in. SWE is very useful, if you want to go into software development, QC, testing, etc. CS is good for a generalist - support to the sciences and technology, research, systems programming, etc. It's close to an applied math degree.

If you take enough of the right courses, they're almost interchangeable. I don't know about relative numbers of jobs.

[TheFallibleFiend]

Also, search on "computer science vs software engineering"

[mangral26]

tell me cs is good or not

[TheFallibleFiend]

@mangral26 By what criteria do we establish whether it's good? IMO, Yes. CS is very good, but it depends on what you like and you should keep in mind that it's usually a lot more engineering than science. Interesting and varied work, good pay.

[EmperorCesar]

Thanks for the vids

[fcobarcellos]

Great video, and hpe c more videos aka this, and I have all The FallibleFiend series,

from an enthusiastic logic circuits brazilian OM.

thnks&GL

[Raj53212]

GREAT WORK!!! Keep up the good work :)

[bananasandgel]

great videos! thanks

[carlossabates]

Coolest vid EVER!!!!!

[darijo203]

Great video!