22 Aug
2015
22 Aug
'15
9:32 p.m.
On 2015-08-22 5:23 PM, Sean Conner wrote:
For my own morbid curiosity, and because it came up on another mailing
list I'm on [1], what machines commercially avaialble were sign magnitude
and one's complement? Every machine I've encountered was two's complement
(okay, IEEE 754 [2] is a sign magnitude format but I'm talking about integer
implementations here, not floating point). I've only found reference to one
sign magnitude computer (the IBM 7090, release in 1959) and a few one's
complement machines (mostly the PDP series from DEC).
Where there others? And honestly, are there any machines that use
anything other than two's complement today?
CDC 6000 series are significant one's-complement machines.
--Toby
-spc
[1] http://lua-users.org/lists/lua-l/2015-08/msg00386.html
[2] AKA floating point.