Pascal vs. Delphi and Pointer problem

Im searching for any difference between Borland Pascal 7.0 for DOS and
Delphi for Windows because i have to write an article for school. I know
its like a compare between a bike and a luxus but please write all you
know about it or send URL of articles or .... article from the first test
/ release of Delphi 1.
You can also write.: Delphi is .... because Windows is ......

Does anybody know how i can set a the Pointer to the screen offset b800
and cange for exaple the color of the char?

Please help. Thank you.

Guenther Haslbeck