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Datecode

"A quick lesson in yamaha datecodes: (not sure if the cutoff was 1989, 1990 or 1991 but its one of those)
Pre cutoff: yl ww LL r
Post cutoff: Yyww LLlr
Y = year most significant (9 or 0 or 1 for 199x or 200x or 201x)
y = year least significant (2 = 1982, 3 = 1983 ... etc ... 9 = 1989) (0 = 1990 for only chips pre-cutoff?)
LLl = lot code/batch code?
ww = week within year
r = die revision"

Chips