The basic four S10 (Model 4005 and 4105) was availble about 1982 or 1983.
First, the system, initally developed by Direct Inc was available with 2 80 track DS/DD 5 1/4 incl floppy drives. Later there was a harddisk (for BB/M only) available as well.
I'm still searching for the service manual for the S/10 to be able to repair my one. It seems to have problems with the floppy controller interrupt (and with the original floppy drives). Using 3 1/2" drives i was able to boot from the BB/M disk until the point the software for the terminal was loaded. At this point i was also able to load CP/M but got a disk fault error message from the CP/M bios. (see pictures.
Here are some pictures as well as some disassembly of my (not yet working) s/10
pictures of my S/10
commented disassembly of the floppy load rom, as well as for the BB/M and CP/M loader from disks;