Re: IBM Clocks was: Re: Way OT: One Room Schools
Here it is http://www-03.ibm.com/ibm/history/exhibits/cc/cc_intro.html Paul Feller AIT Mainframe Technical Support [EMAIL PROTECTED] (319)-355-7824 -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of David Boyes Sent: Friday, July 27, 2007 11:38 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: IBM Clocks was: Re: Way OT: One Room Schools > But what if, we decided to make the IBM clocks functional again. > Is there a documentation source, or other info on how these things work? The URL on IBM clocks someone posted earlier in this thread has very detailed maintenance docs on how the master clocks function. It's basically a pulse generator at 2 second intervals, but at a relatively high voltage and current for modern solid-state control. Not difficult, but parts will be expensive to control that many solid-state relays and associated power supplies.
Re: IBM Clocks was: Re: Way OT: One Room Schools
> But what if, we decided to make the IBM clocks functional again. > Is there a documentation source, or other info on how these things work? The URL on IBM clocks someone posted earlier in this thread has very detailed maintenance docs on how the master clocks function. It's basically a pulse generator at 2 second intervals, but at a relatively high voltage and current for modern solid-state control. Not difficult, but parts will be expensive to control that many solid-state relays and associated power supplies.
IBM Clocks was: Re: Way OT: One Room Schools
Speaking of IBM clocks... In my neck of the woods, we have a new school for the last few years, "The Soulard School". It first started as Pre-K and K. Now it is expanding a grade a year. Anyway, it bought a surplus school building from the City of St. Louis Public School district. And it has IBM clocks in it. Non functional. Now the cheaper solution is to get a dozen "atomic clocks" from Walgreens as they will always (most always) have the correct time. That seemed to be the major function of the IBM clocks. But what if, we decided to make the IBM clocks functional again. Is there a documentation source, or other info on how these things work? When I went to grade school, it was always fun to watch them resync after the Daylight Savings time change. Usually happened 10 AM the following Monday. Wow! Look at the time change!! Hey...it was a simpler time then (ok, I was simpler ). Tom Duerbusch THD Consulting >>> Alan Ackerman <[EMAIL PROTECTED]> 7/27/2007 12:07 AM >>> I attended a one-room school in first grade, Rooster Rock School near Danboro, PA. First and second grade all in one room. It sure sounded to me like the second graders got to read more interesting stuff than we did. We had one clock, but I don't know if it was IBM.
