DougieLawson wrote: ↑
Fri Aug 04, 2017 9:23 am
rpdom wrote: ↑
Fri Aug 04, 2017 5:49 am
jahboater wrote: ↑
Thu Aug 03, 2017 10:28 pm
]I believe TOS in this case refers to a complete operating system running off tape drives, rather than just a filing system.
Yes, I understand that. I've used mainframes that booted from tape and could run simple stuff using just tape drives without using their disks, but it was slow.
You must be quite a bit older than me. The first mainframes (S/370-168 & 3033) I worked with had lots of 3330-1, 3330-2 and 3350 hard drives and ran OS/VS2 MVS with JES3. IPL was from disk.
TOS ran on S/360 systems. By the time the S/370s came along, TOS was long gone. As I noted, TOS didn't support disk drives--at all. If you had disk drives, even 2311s, you ran DOS or (on larger systems), OS. There was one single task version of OS that would boot on a 96K machine with enough space to have a single 16K partition. You could start the reader, stop it, run the program. then start the writer to get any output. But that all predated OS/MFT and OS/MVT. OS/VS2 was, IIRC, derived from OS/MVT. It's been rather a while since I dealt with any of them...