[TUHS] Command-line options

Charles Anthony charles.unix.pro at gmail.com
Sat Mar 26 13:09:26 AEST 2016

On Fri, Mar 25, 2016 at 7:10 PM, John Cowan <cowan at mercury.ccil.org> 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
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