Computers have changed a lot in the hardware details over the
decades, yet they are still using a fundamental architecture that
hasn't changed very much at all.
Which of the following is not part of a computer:
The clock does the following:
Determines the speed of the processor
Determines the speed of the memory
Sets the timestamp for files and network I/O
Synchronizes with GPS satellites
all of the above
It may be surprising, but we can create any number we want
out of just two digits, zero and one. These two binary
digits are called bits.
Essential to creating binary numbers is knowing your powers
of two. You'll soon be able to create the following table
quickly and reliably:
The binary equivalent of 5 is
The decimal equivalent of the binary number 1010 is
none of the above
Let's also try some of the following numbers:
There are some interesting observations to make about those
Once we have numbers, we can represent characters and text
by simply numbering the characters.
the ASCII Table
The ASCII character set table.
What is 67 expressed as ASCII?
What are 115, 49 and 48 expressed as ASCII?
How many bits to represent the decimal number 1,000?
it can't be determined from the given information
The fact that ASCII uses a limited number of bits has
important implications. It can't represent an unbounded number
of characters. This is true of all representations that
use a limited number of bits.
It's happens to be the case
that .wellesley.edu is a "class B" domain, which
means all the IP addresses are of the form 149.130.x.y where x
and y are 8-bit numbers. When your device connects to our
network, it gets assigned one of those IP addresses.
How many devices can connect to the Wellesley network
before we run out of IP addresses?
Next time, we'll learn about colors, color primaries,
and representations of colors. It will turn out that
computers almost always use 24 bits to represent a color.
How many colors is that?
Will be posted later, visit again after
1. C. BLU is not part of the computer.
2. A. The clock determines the speed of the processor
3. D. The binary equivalent of 5 is 101
4. D. The decimal equivalent of 1010 is 10.
5. C. The ASCII character 67 is "C"
6. B. Since 2^10 = 1024, 10 bits sufficient to represent 1,000
7. C. two 8 bit numbers is the same as a 16-bit number, so 2^16
8. B 24-bit color means 2^24 colors