Very strange. A decimal machine using six-bit “bytes” for storing each digit/character. It has memory partitions for multiprogramming, too.
Here’s a link to the documentation I’ve been able to find so far:
https://www.bitsavers.org/pdf/singer/systemTen/
I couldn’t find any emulators or software. I’d be willing to have a go at writing an emulator, with no guarantee of success.