datasheet wanted

[Roy J. Tellason]

Anybody have,  or know where I can get,  a datasheet for these chips I have 
some of that are marked "74S409" and "DP8409"?  I haven't had much luck 
finding one so far...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin