Operating systems of the 1970s handling dates beyond the year 2000

John Wilson wilson at dbit.com
Mon Jan 19 02:05:04 CST 2015

On Mon, Jan 19, 2015 at 02:07:59AM -0500, Mike Alexander wrote:
>MTS will work ok until the original IBM TOD clock overflows in 2042.

I always liked how the March 1/1900 starting point sidestepped the
leap-year ugliness.

>Fixing it for 2042 will be a bigger problem if
>anyone who cares is still around.  Since STCK is a non-privileged
>instruction finding and fixing the problems will be challenging.

The great thing about emulation is that you can make an instruction be
as thorny as you want, temporarily, to flush out stuff like this.

John Wilson, ETS4
D Bit

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