25 May
2017
25 May
'17
8:33 a.m.
On 05/25/2017 08:13 AM, Paul Koning via cctalk wrote:
.
For some definition of "standard". It seems that IBM did this, and DEC prior
to the PDP-11, but other machines of that time or earlier numbered bits according to the
power of 2 they represent, i.e., the "current standard". CDC and Burroughs are
examples.
Not all CDC machines did; consider the Cyber 200 series:
http://bitsavers.informatik.uni-stuttgart.de/pdf/cdc/cyber/cyber_200/602560…
But that only made sense, as the Cyber 200 machines are bit-addressable.
For a time, my work straddled both the Cyber 70 and 200 systems, and
so had to adjust my thinking. Not just bit-ordering, but the 70/6000
used 6-bit display code, while the 200 used 8 bit ASCII.
Fun times.
--Chuck