First computer with real-time clock?

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Thu Jul 29 15:18:28 2004

John,

   Do you have any docs for the Digital pathways cards? I have a pile of them.

   Joe




At 10:44 AM 7/29/04 -0700, John wrote:
>> On Thu, 29 Jul 2004, Andy Holt wrote:
>>
>> > If you mean a clock that maintains time when power is off or gets the
time
>> > by radio then we are probably into the micro era.
>>
>> Yes.
>>
>> But I can't imagine there was not a real-time clock (i.e. as described
>> above) as at least an option for an earlier computer system.
>
>Certainly during the era of PDP-11s, DEC had a number of possible solutions,
>though our lab never used them. Instead we used the Digital Pathways TCU
>series. For example, see the manual for a Unibus board:
>
><http://dundas-mac.caltech.edu/~dundas/retro/tcu-150.pdf>
>
>We used these in several 11/55s:
>
><http://dundas-mac.caltech.edu/~dundas/retro/tcu-trans.pdf>
>
>There were also Qbus versions:
>
><http://dundas-mac.caltech.edu/~dundas/retro/tcu-50.pdf> and
><http://dundas-mac.caltech.edu/~dundas/retro/tcu-50qd.pdf>
>
>See this for more information:
>
><http://dundas-mac.caltech.edu/~dundas/retro/tcu-lit.pdf>
>
>Granted this was probably well after the IBM 650 (I'm not familiar with that
>machine).
>
>Hope this helps.
>
>John
>
>
>
>
Received on Thu Jul 29 2004 - 15:18:28 BST