On Fri, 7 Nov 2025 09:52:56 -0500, Phil Smith III wrote: > ... >The 3420 reminds me: back at UofW, they had a system that would create a >4-character hash (I assume) from the tape number. So when you asked for tape >1234, the operator would pull it and when they responded to the mount request, >they had to enter that 4-character value. If they'd accidentally pulled 1235 >instead, there would be a mismatch and it would tell them to try again. > Isn't that what labels are for?
I fear I don't understand the process. IIRC, Automatic Volume Recognition worked only if the volume was mounted *before* the program requested it. I had worked earlier with a non-IBM system where the operator could mount a volume in response to a console message and reply, "LOOK" rather than unit number, and AVR would operate. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
