Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!rutgers!ucla-cs!zen!ucbvax!cbosgd!cwruecmp!neoucom!wtm 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