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> Xerox Sigma IX Time Sharing computer The thing appears to have 128KB RAM and it can do time sharing... Impressive!
by wiz21c 3y ago
> Xerox Sigma IX Time Sharing computer
The thing appears to have 128KB RAM and it can do time sharing... Impressive!
- retrac 3y agoThe SDS Sigma 7 was one of the first computers sold commercially with the hardware to support memory virtualization and user/supervisor modes. It got some early time-sharing use. SDS later got bought by Xerox, and carried the business forward into the 1980s, where they eventually got squeezed out, IIRC. They were a big player for a while, but mostly for pragmatic factory installations, online calculator services, library catalog lookup, stuff like that, not the associated programmer/hacker culture, so the machines are now mostly forgotten. The LCM apparently had one? https://commons.wikimedia.org/wiki/File:LCM_-_Xerox_Sigma_9_(right)_and_related_equipment_-_01.jpg https://commons.wikimedia.org/wiki/File:LCM_-_Xerox_Sigma_9_...
- pinewurst 3y agoYes and they used to offer online access to it as well.
- flyinghamster 3y agoBack in those days, that was quite a lot of memory. An entire megabyte was an amazing luxury. My high school's PDP-11/34 was maxed out with 128Kwords (256 KB), and it was configured for at least 12 (maybe 16) users, with up to 56 KB user memory + 8 KB of run-time system per user and swapping handling the overload. But, back then, memory was an expensive luxury - that KIM-1 had all of 1K, so you had to make every byte count.