[tomp]

Which systems don't use two's complement?

[glangdale]

Unisys apparently ships some emulators of a old system that still use one's complement... much as I hesitate to ever link to any ESR material, there's a good article here:

http://esr.ibiblio.org/?p=7413

[hal_9e3]

https://en.wikipedia.org/wiki/UNIVAC_1100/2200_series#Archit...

"I'm not dead yet!" https://www.unisys.com/offerings/clearpath-forward/clearpath...

https://en.wikipedia.org/wiki/Ones%27_complement

[jandrese]

A handful of ancient legacy systems. Very few people today need to worry about their webapp being ported over to UNIVAC.