Bits and Bytes. ASCII/EBCDIC. There was one other problem with bytes: Compatibility. Given the binary sequences:. Manufact. #1:. Manufact. #2:. Manufact. #3:. A. 0. +. 0000000. B. 1. -. 0000001. C. 2. *. 0000010. D. 3. ?. 0000011. . . .
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Given the binary sequences:
Manufacturers Interpreted them differently
Which is the Correct Interpretation???
Each is equally Correct
What’s the Solution ???
The American Standard Code for InformationInterchange
Sample ASCII Codes:
Lower Case ‘a’
Lower Case ‘b’
A Preview of Things to Come:
Are We limited to only 128 (= 27) characters ??
Yes and no:
There is an EXTENDED ASCII Character set which uses ALL 8-bits (1-byte) available (parity is NOT an issue)
What does the term ‘ASCII file’ Mean ??
An ASCII File assumes that every 8-bits (1-byte) in the file are grouped together according to the ASCII tables
Aren’t ALL Files ASCII Files ??
NO - As we will see later, not all data is stored according to ASCII formats
That Helps (sort-of) to explain why when we display non-ASCII files we sometimes get characters such as , , , , , and
Do ALL computers use ASCII to Represent Symbols???
NO - Although most do.
IBM had the first Coding Scheme (dating back to 1880)
EBCDIC is still used in IBM Mainframes and to store data on large reel-to-reel Tape Drives
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