Re: latest ProDOS 8/Basic System ?

[mjmahon@aol.com (Michael J. Mahon)]

william strutts wrote:

<snip>
>Prodos has a date table which needs to be updated every seven years.

Actually, the table is seven entries long (indexed into by day of week),
but it can map only 5 or 6 years, depending on whether the range contains
one or two leap years.

Each leap year occupies two slots in the table.  So if the first or second
year is a leap year, then the fifth (probably!) also is, and they consume four
slots, leaving only three other slots for the intervening non-leap years.
If the first is a leap year, then five full years will be mapped.  If the
second
is a leap year, then five full years will be mapped plus part of the sixth
(the part before February 29).

If the first or second year is not a leap year, then only one leap year falls
in the range of the table, and five non-leap years can be accomodated for
a total of six years.

-michael

 Email:  mjmahon@aol.com
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