Date: Wed, 27 Dec 2023 08:57:42 -0800 From: Mark Millard <marklmi@yahoo.com> To: John F Carr <jfc@mit.edu>, bob prohaska <fbsd@www.zefox.net> Cc: "ticso@cicely.de" <ticso@cicely.de>, Marcin Cieslak <saper@saper.info>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: USB-serial adapter suggestions needed Message-ID: <6DD2FDE4-77DB-499A-AED8-F179A9DAA0EF@yahoo.com> In-Reply-To: <23100FB9-BB4A-48FF-A715-84EF7F6F59A6@mit.edu> References: <ZYd%2Bmid70Sc1xg//@www.zefox.net> <snq8819p-3q19-o239-7op5-sss807q66082@fncre.vasb> <ZYeDi2H754ZKyJG3@www.zefox.net> <16864054-4os0-pq3p-7qp0-7299666908os@fncre.vasb> <ZYhSYNxHcmR2I/YP@www.zefox.net> <ZYhjzPLUBT74EVau@cicely7.cicely.de> <ZYiI7KuPwabExucl@www.zefox.net> <55q37289-ss30-nq9o-7r31-086n999p394s@fncre.vasb> <ZYonM2b2X008mpaw@cicely7.cicely.de> <ZYuHW34T1rxwqdz6@www.zefox.net> <C8C30A69-05D5-45FE-B95D-A31BD13B841F@yahoo.com> <23100FB9-BB4A-48FF-A715-84EF7F6F59A6@mit.edu>
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On Dec 27, 2023, at 05:48, John F Carr <jfc@mit.edu> wrote: >=20 >> On Dec 27, 2023, at 03:30, Mark Millard <marklmi@yahoo.com> wrote: >>=20 >> 0000: 6C 6F 67 69 6E 3A 20 C3 AF C2 BF C2 BD C3 AF C2 login: = ......... >> 0010: BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 = ................ >> 0020: AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 = ................ >> 0030: BD C3 AF C2 BF C2 BD 0A 50 61 73 73 77 6F 72 64 = ........Password >> 0040: 3A : >>=20 >> The byte pairs that start with C3 's and C2's look far from >> random to me --also they do not look like glitches. >=20 > Those byte pairs are valid UTF-8. But not unique to a UTF-8 encoding: not self identifying. Extended ASCII is another possibility, for example. > C3 AF =3D 000 1110 1111 =3D EF > C2 BF =3D 000 1011 1111 =3D BF > C2 BD =3D 000 1011 1101 =3D BD >=20 > What EF BF BD means, I can't say. As Unicode it is "=C3=AF=C2=BF=C2=BD"= . > Maybe UTF-8 encoded 8 bit line noise. The subsequence (line split differently): C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD C3 AF C2 BF C2 BD (8 repititions) is rather systematic for a glitch or random line noise. As UTF-8 (also showing UTF-16's alternate, matching John's) ( https://www.charset.org/utf-8 ): C3 AF: 239 U+00EF C3 AF =C3=AF Latin Small Letter I With Diaeresis C2 BF: 191 U+00BF C2 BF =C2=BF Inverted Question Mark C2 BD: 189 U+00BD C2 BD =C2=BD Vulgar Fraction One Half As extended ASCII ( https://www.ascii-code.com/ ): C3: 195 303 C3 11000011 =C3=83 Ã Ã Latin capital letter A = with tilde C2: 194 302 C2 11000010 =C3=82 Â Â Latin capital letter A = with circumflex BF: 191 277 BF 10111111 =C2=BF ¿ ¿ Inverted question mark BD: 189 275 BD 10111101 =C2=BD ½ ½ Fraction one half AF: 175 257 AF 10101111 =C2=AF ¯ ¯ Spacing macron - overline Binary is ^^^^^^^^ So C3 AF C2 BF C2 BD on separate lines with binary showing are: C3: 11000011 AF: 10101111 C2: 11000010 BF: 10111111 C2: 11000010 BD: 10111101 C3: 11000011 So: multi-bit changes from one to the next across the repeating sequence. Again: It does not appear to me to be gitches or random line noise. Systematic line noise also seems rather unlikely. =3D=3D=3D Mark Millard marklmi at yahoo.com
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