Displaying extended ASCII characters in output of octal dump as hexadecimal

[Olumide]

When I run octal dump (od) I notice that extended ASCII characters are 
displayed incorrectly as ordinary characters. For example, the extended 
characters 191, 196, and 218 are displayed as '?' , 'D' and 'Z' 
respectively. I thought od was 'anding' the each character with 127, but 
I've been informed that this because my shell/terminal is not configured 
to display non-ASCII characters.

How can I configure Cygwin to display extended characters as in 
hexadecimal format?

Thanks

- Olumide

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