What are the difference between ascii-7 and ascii-8?

Answer 1

According to this site.. (http://www.roysac.com/blog/2008/09/what-is-ascii-art-what-is-ansi-and-more.html)

What is 7-Bit ASCII?

The difference between 7-bit and 8-bit ASCII is pretty simple, assuming that you have a keyboard with the latin alphabet. 7-bit only uses characters that you can find on the keyboard. 8-bit uses additional characters that you cannot find on your keyboard, but which exist in "text mode" of the old MS DOS operating system. MS DOS hat 256 characters for text mode. Some of them are control chracters and not visible, such as Carriage Return, Line Feed (Line Break), the Tab character or the Escape character. The standard US-ASCII characters are the first 128 chracters of the character set, where 97 of them are usable for text and ASCII art.

What is 8-Bit ASCII?

8-bit ASCII art uses primarily characters after the 128 chracters of the US-ASCII character set. You cannot find those characters on your keyboard and could only generate them via programming code, special editors (like TheDraw or ACiDDraw4) or by pressing the ALT-Key and then type the character code (a number between 128 and 255) on your numeric keypad, while keeping the ALT-Key pressed. Those upper or "higher" characters are suitable for basic graphical elements, such as box borders, corners. Those characters are unique to the IBM PC and MS DOS and are not compatible with other operating systems, such as UNIX, Linux or MAC OS.