The rules is *sometimes* true. But not always.
Few examples:
Tapes: 726, 727, 728, 729, 7330 ...24xx family, 34xx family, 3480, 3490
---> 3590, 3592.
CPC: 9671, 20xx, 390x, 856x
Libraries: 3995, 3994, 3584, 3995...
Disk: 5444, 1405
and 7302 - not a disk...
2301 is a drum - DASD, but not disk
However fortunately this is finite list. And documented quite well. Of
course similar and somehow consecutive names are easier to remember:
when we talk about 3390, 3380, 3350, or 3330 we actually have to
remember only one character. Things become worse when talking about
93... yes. 93-something.
--
Radoslaw Skorupka
(looking for new job)
Lodz, Poland
W dniu 21.03.2021 o 22:19, Charles Mills pisze:
x2yz would be a terminal type device (e.g. 2260, 3270)
x3yz would be a disk type device (e.g. 2301, 2311, 2314, 3330, 3390)
x4yz would be a tape type device (e.g. 2400)
x5yz would be a card type device (e.g. 2540)
x7yz would be telecommunications type device (e.g. 2701, 2780, 3780)
In all cases x=2 would be "second generation," i.e. System 360; x=3 would
the "third generation," i.e. System 370.
x=1 would be first generation and is a different numbering scheme -- e.g.
1052 is a console, 1403 is a printer.
IIRC the S/360 CPUs were, e.g., 2040 for the 360/40 and the S/370 CPUs were,
e.g., 3155 for the 370/155
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Seymour J Metz
Sent: Sunday, March 21, 2021 12:49 PM
To: [email protected]
Subject: Re: z/TPF questions
The 3215 was the s/360 console printer keyboard
No; the 1052-7 was the console typewriter for various S/360 models. The 3210
and 3215 were console typewriters for low end S/370 models, eventually
replaced by special models of the 3270, e.g., 3278-2A, 3279-2C.
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