From mboxrd@z Thu Jan 1 00:00:00 1970 From: charles.unix.pro@gmail.com (Charles Anthony) Date: Fri, 25 Mar 2016 20:09:26 -0700 Subject: [TUHS] Command-line options In-Reply-To: <20160326021018.GG897@mercury.ccil.org> References: <201603251443.u2PEh8OZ019856@skeeve.com> <20160325212925.GA5761@minnie.tuhs.org> <20160325232516.GG3766@eureka.lemis.com> <20160326021018.GG897@mercury.ccil.org> Message-ID: On Fri, Mar 25, 2016 at 7:10 PM, John Cowan wrote: > > So they did, but DEC machines in general were always ASCII. The PDP-8 > used both 8-bit characters (ASCII with the high bit set) and 6-bit > ones (stripped ASCII without control characters or lower-case ones). > The former were packed three 8-bit characters in two 12-bit words; the > latter, two characters in one 12-bit word. The PDP-10 packed five 7-bit > characters into a 36-bit word with one bit left over, which was used > (if at all) for various purposes. Not until the PDP-11 did the 8-bit > character get aligned with the machine word size. > > And Dec's RADIX-50, packing 3 characters into 16 bits. (IIRC the origin of the 6.3 filenames. bit I can't document that.) -- Charles -------------- next part -------------- An HTML attachment was scrubbed... URL: