25 Sep
2020
25 Sep
'20
6:22 a.m.
On Thu, Sep 24, 2020 at 6:20 PM Greg 'groggy' Lehey <grog(a)lemis.com>
wrote:
On Wednesday, 23 September 2020 at 22:33:38 -0400,
Clem Cole wrote:
Don't know about the others, but I'm pretty sure PDP-10 wasn't 1's
compliment / was 2's compliment..
Warner
Dave: Seymour used ones complement on the 3000
and 6000 series.
Maybe there? The primary HLLs I used on the CDC boxes were FTN and
Pascal, but I would not be surprised if that was were you saw it.
I think most of the bigger pre-IBM 360 machines used one's complement.
Didn't the PDP-10? I knew it not only from the CDC 3200 and 3800, but
primarily from Univac (1108 and 494). The Univac techies explained to
me that the primary arithmetic function was subtraction; addition was
subtracting the complement. And that worked faster with one's
complement.