First computer with real-time clock?

From: vrs <>
Date: Mon Aug 2 19:04:10 2004

From: "Paul Koning" <>
> It sure doesn't look like that from the docs on Al Kossow's website.
> It seems that the 650 doesn't have interrupts, which would make a
> simple periodic tick type system pretty problematic.
> If the exercise is to attach the credibility of the document, it looks
> to me like you have enough data to do that. You can clearly say
> "there isn't any such thing as an 'internal clock feature' on the
> 650". That puts the ball in the other party's court, to try to
> demonstrate that there did exist some obscure add-on of which not a
> word appears in the dozen or so IBM docs that are on-line.
> And even then, another question becomes whether the time stamp is real
> or a forgery, independent of what machine generated it.

Assuming it isn't a forgery, doesn't the lack of interrupts make a RTC
option (that actually keeps the time) *more* likely, rather than less?

Otherwise, you'd have to poll an interval timer, and that seems a pretty
dicey proposition, particularly if it was an obscure option and the software
wasn't really designed around it.

Of course, it is also quite possible that the software just asked the user
what date/time to put on the printout :-).

Received on Mon Aug 02 2004 - 19:04:10 BST

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