Week 1 Flashcards
First general purpose electronic digital computer?
ENIAC
1946
First programmable binary digital computers? Year?
EDSAC 1949
What is a microcode?
Microcode- is a set of detailed hardware level instructions used to implement machine language instructions.
Why is microcode used?
Microcode reduces complexity and simplifies design.
Integer data types?
Unsigned Signed(Sign magnitude and two complement)
What is unsigned integer?
Zero and positive numbers.
2^8 = 256 different integers
Min 0 Max 255
What is a signed integer?
Whole numbers plus negative numbers.
If very left = 0, then its positive
1, then its negative
What is lossless compression?
Lossless compression reduces the size of data without losing or changing any information.
Eg. Zip
What is compression ratio?
The effectiveness of the compression method.
10:1 one tenth of original size.
What is lossy compression?
Lossy compression algorithms change or discard some of the data in a way that is hard to notice for human senses.
Specify some of compression ratios:
JPEG - 10:1 or 20:1
Mp3 - 10:1
Mpeg- 100:1 to 200:1