What do all the different parity options mean?

[Steven H. Izen]

I know what even parity and odd parity are, but what does *space* or
*mark* mean in a parity choice?  Also, I think I understand what happens
when the bits/parity is 8/none or 7/even or 7/odd.  But where is the parity
bit stored when 8/even is used?  Is there any good introductory reference
to this?

Thanx.
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