ISO: A good explanation of EBCDIC control seuqnces

[Chuck Guzis]

Lately, I've been plowing through a bunch of EBCDIC-encoded WP 
documents.  I don't have a problem finding EBCDIC charts with 
mnemonics, but I'd like some more detail on control character 
operation.  For example, what's the difference between  IT PT and HT? 
What sequence does CSP introduce and what are its variations?

I've done some web searching but can't come up with anything 
definitive.  Any pointers would be welcome.

Cheers,
Chuck