Well, for some devices the CU and device were in the same box, e.g., 2501.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Alan Altmark <alan_altm...@us.ibm.com> Sent: Wednesday, May 15, 2019 5:45 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Ancient DASD connectivity On Wed, 15 May 2019 21:41:20 +0000, Seymour J Metz <sme...@gmu.edu> wrote: >That may be true for 2314, but it is not true for anything later. The A unit >connects to the control unit, not to the channel. > I actually intended to say that the A units connected to the control unit. I don't know why I said "channel". (sigh) Everyone knows an I/O device can't talk to a channel! :-) Thanks for noticing! Alan ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
