David asks:

> For an argument, if HP3000 (lets say Series 918) does not fail mechanically
>  for next 25 years, will there be any obsticles that can go wrong with the
>  machine that will force us to stop using the machine? (no, I don't care
> about technology changes)
>  IE: Batteries or Date problems

January 1, 2028 is going to be a problem. Seven bits (0 to 127) are assigned
to the year number, beginning with the year 1900, in the internal calendar.
That number will overflow at midnight, Jan 1 2028, thus you won't get your
full 25 years. Rather, you only have 24 years, 6 1/2 months left.

Wirt Atmar

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