Some legacy devices, e.g., 1301, had external controllers, e.g., 7631.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Tony Harminc <[email protected]> Sent: Thursday, May 16, 2019 3:34 PM To: [email protected] Subject: Re: [External] Re: Ancient DASD connectivity On Thu, 16 May 2019 at 12:50, Alan Altmark <[email protected]> wrote: > Disk, tape, and unit record devices of the same era had discrete > controllers. Unit record CU (2821) was interesting in that it talked to > devices that did different things: 1403/1404 printer and 2540 card > reader-punch. Clever of them. > Another way to think of the 2821 is as a bridge between "modern" (S/360) channel protocols, and "legacy" (1401-style) devices like the 1403 printer. Tony H. ---------------------------------------------------------------------- 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
