From mboxrd@z Thu Jan 1 00:00:00 1970 From: random832@fastmail.com (Random832) Date: Sun, 27 Mar 2016 02:18:33 -0400 Subject: [TUHS] Command-line options In-Reply-To: <20160327020112.GQ3766@eureka.lemis.com> References: <201603251443.u2PEh8OZ019856@skeeve.com> <20160325212925.GA5761@minnie.tuhs.org> <20160325232516.GG3766@eureka.lemis.com> <20160326021018.GG897@mercury.ccil.org> <4B49E73B-51BD-4834-AA8C-5F9F74BA784E@ronnatalie.com> <20160327020112.GQ3766@eureka.lemis.com> Message-ID: <1459059513.1943874.560637466.6C561BB5@webmail.messagingengine.com> On Sat, Mar 26, 2016, at 22:01, Greg 'groggy' Lehey wrote: > All octal from here on. > > CDC had several different character sets, most called BCD. They were > unlike Fieldata, which in fact bore some resemblance to ASCII (letters > starting @ABC.. from 0 (or 40 in ASCII), digits starting at 60, ...) Wikipedia mentions one called "CDC display code" that went :ABC..., then the digits followed after Z. Also, according to Wikipedia, Fieldata was a seven-bit code with A at 006 (putting Z at 037) - it wasn't ASCII-like at all, except for having the letters in a continuous run. > > In 7600 BCD, ABC started at 21 (internal) or 61 (external), and digits > started at 00, though in the external form 0 was out of line at 12. > The 3200 system had different coding again; digits were XS3 starting > at about 53. > > As if that wasn't enough, the code table I'm looking at right now > (7600) has something called ASCII SUBSET with (upper case) letters > starting at 41 and digits starting at 20. No idea why they called it > ASCII. That sounds like ECMA-1. Does it start off "sp HT LF VT FF CR SO SI ( )" from 00? http://web.archive.org/web/20070407200421/http://homepages.cwi.nl/~dik/english/codes/stand.html mentions it as an "ISO 6 bit"