>>I'm thinking farther back. Was there any mini or mainframe that had a
>>real-time clock built in or as an add-on option?
>It's come up in some litigation. The actual issue at hand is that
>someone was able to overturn a patent by claiming the IBM 650 had a
>real-time clock built in. They "proved" this by submitting as evidence a
>printout that had the date printed on it(!) I've checked the IBM 650
>Manual of Operation and it makes no mention whatsoever of a real-time
>clock. I pretty much figured it wouldn't but I of course had to do due
>diligence.
>But it made me wonder: what was the first computer to have a built-in
>real-time clock?
The 11/93,94 has built-in date/time. But that was end of 80s, early
90s.
Prior to that, the Pro series had the TOY (time of year) clock built in.
That was in the mid-80s.
Prior to that, at least with Unibus PDP-11s, CSS (Computer Special
Systems, DEC Nashua) came up with the KW11-C, a clock/calendar
board which, from the drawings I have, was supposed to eventually
be able to get its date/time from the WWVB signal. Otherwise it
could be programmed with current date/time as well as date/time
for a future event which would cause an interrupt. I have a
programming manual for it somewhere (in my proverbial deep
storage). This was early 80s.
I seem to remember a KWV11-C, for qbus -11s, but I don't know what
its features were.
--
Sellam Ismail Vintage Computer Festival
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Received on Thu Jul 29 2004 - 12:10:09 BST