Differences

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--- vendor:yamaha [2017/04/25 17:11] – cleaned up page significantly, removed redundant/incorrect info lord_nightmare
+++ vendor:yamaha [2020/10/01 01:25] (current) – new style 'A' datecode is almost certainly Yamaha's own Kagoshima Fab lord_nightmare
@@ Line 4: / Line 4: @@
 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 ======
@@ Line 9: / Line 15: @@
   Yamaha Datecode/Markings:
 -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?
 + 'new style':
   Yyww MLlr
   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?)
+  ww = week within year
   M = Manufacturer code, see table below; old style and new style chips have different tables
   Ll = lot code/batch code?
-  ww = week within year
   r = die revision
@@ Line 22: / Line 32: @@
 ====== Fabs ======
-'old style' markings:
+  'new style':
- =
+  A = Yamaha (Kagoshima)
-= Sharp?
+  C = Hitachi 2a
-=
+  D =
- (= L) = Hitachi 2
+  E = Hitachi 1
-= Sharp (NDIP)
+  F = Fujitsu
-= Hitachi
+  G = Hitachi 1a?
-=
+  H = Sharp 1
-= Hitachi or ROHM (NDIP)?
+  I (= 5) = Sharp (95% certain)
-X =
+  L (= 4) = Hitachi 2
-Y = Hitachi?
+  O =
-Z = Fujitsu
+  Z = Fujitsu 2
-'new style':
-A = Sharp 2
-C = Hitachi 2
-D =
-E = Hitachi 1
-F = Fujitsu
-G = Hitachi 1
-H = Sharp 1
-I = Sharp
-L (= 4) = Hitachi 2
-O =
 ====== Chips ======