two's complement, was Re: Now OT

Lars Brinkhoff lars at
Thu Jun 23 12:37:58 CDT 2016

Paul Koning <paulkoning at> writes:
> in the Electrologica machines (Dutch computers from the late 1950s to
> mid 1960s), double-length values are encoded with the sign bit
> replicated in each word.

The PDP-10 double integer format also duplicates the sign bit, but is
two's complement.

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