Two's Compliment Information Links

Here's some links from the Dr. Math Website, http://mathforum.org/dr.math/

Base 2 Subtraction and Clock Arithmetic
We know that computers use the "2's complement" method to do subtraction of base 2 numbers, and that this method works every time, but we have no idea why it works.
Negative Numbers in Base 2, 16, etc.
Are there negative numbers in alternate bases? Our calculator says that 1-2 in base16 is FFFFFFFFFF. This can't be right!
Negative Numbers in Binary
How do I represent -53 as a binary number? Is it 110101? Wouldn't that be +53?
Binary Division and Negative Binary Numbers
Suppose you enter 11111000 into a binary calculator. How would it know whether that is to be 248 or -8? How does the computer begin the division process? What does it do when it cannot right shift the bits?
Two's Complement
What is two's complement and how is it used?

VB Tutorial on Signed numbers: http://www.vb-helper.com/tutorial_twos_complement.html
This tutorial describes sign-magnitude, ones complement and twos complement representations for integers.

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corrections? Broken Links? Prof Wade: WadeD@ncc.edu