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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.sys.amiga
Subject: Re: PARITY: odd even mark space none
Message-ID: <638@neoucom.UUCP>
Date: Sat, 25-Jul-87 12:12:13 EDT
Article-I.D.: neoucom.638
Posted: Sat Jul 25 12:12:13 1987
Date-Received: Sun, 26-Jul-87 20:50:49 EDT
References: <389@sugar.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 18
Summary: Parity bits explained


NONE = no parity bits added
ODD  = data bit appended so tthat check sum of bits = 1
EVEN = data bit appended so that check sum of bits = 0
MARK = data bit = 0 is appended
SPACE = data bit = 1 is appended

Note that for most practical purposes, 8N parity is the equivalent
of 7S or 8S, since the the appended bit is at the same logic level
as the idle state of the output.  In some systems, space partiy is
used to replace the option of using 1 or 2 stop bits.  For
instance, 8N = one stop bit 8S = two stop bits.  All this parity
nonsense has often resulted in hours of frustration in getting two
devices to talk to each other, especially when the manufacturers
notions of wheter or not the partiy bit is included in the "word
length" differ!

--Bill