Re: USB-serial adapter suggestions needed
Mark Millard <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
On Dec 27, 2023, at 05:48, John F Carr <[email protected]> wrote: > >> On Dec 27, 2023, at 03:30, Mark Millard <[email protected]> wrote: >> >> 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 : >> >> The byte pairs that start with C3 's and C2's look far from >> random to me --also they do not look like glitches. > > 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 = 000 1110 1111 = EF > C2 BF = 000 1011 1111 = BF > C2 BD = 000 1011 1101 = BD > > What EF BF BD means, I can't say. As Unicode it is "�". > 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 ï Latin Small Letter I With Diaeresis C2 BF: 191 U+00BF C2 BF ¿ Inverted Question Mark C2 BD: 189 U+00BD C2 BD ½ Vulgar Fraction One Half As extended ASCII ( https://www.ascii-code.com/ ): C3: 195 303 C3 11000011 à à à Latin capital letter A with tilde C2: 194 302 C2 11000010    Latin capital letter A with circumflex BF: 191 277 BF 10111111 ¿ ¿ ¿ Inverted question mark BD: 189 275 BD 10111101 ½ ½ ½ Fraction one half AF: 175 257 AF 10101111 ¯ ¯ ¯ 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. === Mark Millard marklmi at yahoo.com