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vendor:yamaha [2017/04/25 17:15] – fix formatting lord_nightmarevendor:yamaha [2020/10/01 01:25] (current) – new style 'A' datecode is almost certainly Yamaha's own Kagoshima Fab lord_nightmare
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 According to Tiido and others, Yamaha is a fabless vendor, and has other chip manufacturers do all of their silicon fabrication and packaging. Examples being Fujitsu, Sharp, Hitachi, ROHM. According to Tiido and others, Yamaha is a fabless vendor, and has other chip manufacturers do all of their silicon fabrication and packaging. Examples being Fujitsu, Sharp, Hitachi, ROHM.
 +
 +====== Getting Started ======
 +[[vendor:yamaha:FM|FM Theory]]
 +
 +[[vendor:yamaha:OPL2|OPL2]]
 +
  
 ====== Datecode ====== ====== Datecode ======
Line 9: Line 15:
   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':
-  A = Sharp 2+  A = Yamaha (Kagoshima)
   C = Hitachi 2a   C = Hitachi 2a
   D =   D =
Line 43: Line 40:
   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 2
  
 ====== Chips ====== ====== Chips ======
vendor/yamaha.1493140521.txt.gz · Last modified: 2017/04/25 17:15 by lord_nightmare