Sign magnitude, one's complement, two's complement

Jon Elson elson at
Sat Aug 22 17:43:44 CDT 2015

On 08/22/2015 04:49 PM, Al Kossow wrote:
> On 8/22/15 2:23 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?
> A table of what computers had what numeric representation 
> is one of those things
> that should have been done, but never has. Now that 
> bitsavers has a reasonable collection
> of technical/programming manuals, it might even be possible.
> has some information, but it isn't really in any sort of 
> tabular form.
> AFAIK, the PDP-1 was the only DEC 1's compliment machine 
> that shipped.
The LINC part of the LINC-8 and PDP-12 were one's complement.


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