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vendor:yamaha [2019/02/22 21:07]
cr1901 Start "Getting Started" Section
vendor:yamaha [2019/09/23 19:18] (current)
lord_nightmare add note
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 ====== Getting Started ====== ====== Getting Started ======
 [[vendor:​yamaha:​FM|FM Theory]] [[vendor:​yamaha:​FM|FM Theory]]
 +
 [[vendor:​yamaha:​OPL2|OPL2]] [[vendor:​yamaha:​OPL2|OPL2]]
  
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   Yamaha Datecode/​Markings:​   Yamaha Datecode/​Markings:​
   1981-1989 'old style':​ (may have been used very briefly in 1990)   1981-1989 'old style':​ (may have been used very briefly in 1990)
-  ​yM ww Ll r+  ​ym dd Ll r 
 +  m = month (1-9 = Jan-Sep, X=oct, Y=nov, Z=dec) 
 +  dd = day within month 
 +  L might be a manufacturer code, but could also be the msb of the lot code? 
 +  ​
   1990+ 'new style':​   1990+ 'new style':​
   Yyww MLlr   Yyww MLlr
   Y = year most significant (9 or 0 or 1 for 199x or 200x or 201x)   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?)   y = year least significant (2 = 1982, 3 = 1983 ... etc ... 9 = 1989) (0 = 1990?)
 +  ww = week within year
   M = Manufacturer code, see table below; old style and new style chips have different tables   M = Manufacturer code, see table below; old style and new style chips have different tables
   Ll = lot code/batch code?   Ll = lot code/batch code?
-  ww = week within year 
   r = die revision   r = die revision
  
  
 ====== Fabs ====== ====== Fabs ======
- 
-  'old style' markings: 
-  1 =  
-  2 = Sharp? 
-  3 = 
-  4 (= L) = Hitachi 2 
-  5 = Sharp [probably = I below] 
-  6 = Hitachi 
-  7 = 
-  8 = Hitachi or ROHM (NDIP)? 
-  X = 
-  Y = Hitachi? 
-  Z = Fujitsu 
  
   'new style':​   'new style':​
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   G = Hitachi 1a?   G = Hitachi 1a?
   H = Sharp 1   H = Sharp 1
-  I = Sharp [probably ​= 5 above]+  I (= 5) = Sharp (95% certain)
   L (= 4) = Hitachi 2   L (= 4) = Hitachi 2
   O =   O =
-  Z = Fujitsu ​[This is interesting,​ possibly a printing error which should have been F but they printed a Z instead?]+  Z = Fujitsu ​2
  
 ====== Chips ====== ====== Chips ======
 
vendor/yamaha.1550887653.txt.gz · Last modified: 2019/02/22 21:07 by cr1901
 
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