Nah, 370/158, 4341s. 1980s. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Doug Fuerst Sent: Friday, November 7, 2025 4:38 PM To: [email protected] Subject: Re: Ancient history: 3420s
If those tape drives were on a 7090, they were probably 729's. They went on 7080's, 7090's, and 7094's mostly. Some 1610's IIRC. Long time ago. First machine I fixed as an FE. Equitable Life in NYC. 1973 I think. Doug Fuerst ------ Original Message ------ >From "Phil Smith III" <[email protected]> To [email protected] Date 11/7/2025 16:31:55 PM Subject Re: Ancient history: 3420s >Ah, sorry, I meant to say: it was a physical label on the tape. Kinda an >important detail I omitted! So it wasn't "security" per se, more like the Luhn >on a credit card, to avoid entry error (in this case, "grab error"). > >-----Original Message----- >From: IBM Mainframe Discussion List <[email protected]> On >Behalf Of Paul Gilmartin >Sent: Friday, November 7, 2025 4:28 PM >To: [email protected] >Subject: Re: Ancient history: 3420s > >On Fri, 7 Nov 2025 14:42:59 -0500, Phil Smith III wrote: > >>Lots of unlabeled tapes, especially on VM. >> >>This was a backup for that. >> >How was that "4-character hash " communicated to the operator? > > >>On 11/7/2025 9:52 AM, 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. > >-- >gil > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, send >email to [email protected] with the message: INFO IBM-MAIN > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, send >email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
