Differences

This shows you the differences between two versions of the page.

--- vendor:yamaha [2017/04/25 13:34] – mcmaster
+++ vendor:yamaha [2025/08/04 21:23] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 LN has observed (not sure if always true): "cmos...yamaha part starts with a 3 (nmos parts start with 2)"
+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 ======
-  "A quick lesson in yamaha datecodes: (not sure if the cutoff was 1989, 1990 or 1991 but its one of those)
+  Yamaha Datecode/Markings:
-  Pre cutoff: yl ww LL r
+-1989 'old style': (may have been used very briefly in 1990)
-  Post cutoff: Yyww LLlr
+  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 for only chips pre-cutoff?)
+  y = year least significant (2 = 1982, 3 = 1983 ... etc ... 9 = 1989) (0 = 1990?)
-  LLl = lot code/batch code?
   ww = week within year
-  r = die revision"
+  M = Manufacturer code, see table below; old style and new style chips have different tables
+  Ll = lot code/batch code?
+  r = die revision
+====== Fabs ======
+  'new style':
+  A = Yamaha (Kagoshima)
+  C = Hitachi 2a
+  D =
+  E = Hitachi 1
+  F = Fujitsu
+  G = Hitachi 1a?
+  H = Sharp 1
+  I (= 5) = Sharp (95% certain)
+  L (= 4) = Hitachi 2
+  O =
+  Z = Fujitsu 2
 ====== Chips ======
@@ Line 91: / Line 120: @@
 Sega parts by yamaha:
 YM2602B     315-5124    SDIP        6                           B               1987
-B       315-5308    QFP         Z                           B               1989
+YM6045B     315-5308    QFP         Z                           B               1989
-        315-5309    QFP         X, Y, L?                    C               1988-1991
+YM6048      315-5309    QFP         X, Y, L?                    C               1988-1991
 YM7101      315-5313    QFP         4, A, E, H, L, O, X, Y      C, D, E         1989-1991
 FC1001      315-5313A   QFP         H, L                        C               1992
-C       315-5364    QFP         A                           D               1992
+YM6045C     315-5364    QFP         A                           D               1992
 ?           315-5402
 ?           315-5433    QFP NO YAMAHA STYLE MARKING                             1991
@@ Line 107: / Line 136: @@
 FJ3002      315-5960    QFP         C                           F               1996
-Index:
 Package codes:
 D = NDIP/DIP
@@ Line 115: / Line 141: @@
 F = QFP (sometimes soic, mismarked?)
 S = QFP44
-Manufacturers/Fabs:
-oldstyle:
-=
-= Sharp?
-=
-= L = Hitachi 2
-= Sharp (NDIP)
-= Hitachi
-=
-= Hitachi or ROHM (ndip)?
-X =
-Y = Hitachi?
-newstyle:
-A = Sharp 2
-C = Hitachi 2
-D =
-E = Hitachi 1
-F = Fujitsu
-G = Hitachi 1
-H = Sharp 1
-I = Sharp (verified from multiple chips)
-L = 4 = Hitachi 2
-O =
-both:
-Z = Fujitsu
-Yamaha datecode format:
-"Old style":
-YM WW LL R
-"New style"
-YYWW MLLR
-YY = last 2 digits of year
-Y = last digit of year
-WW = week
-M = manufacturer or fab (code differs for old vs new style?)
-LL = lotcode or production line? (numeric starting at 01 or AA?)
-R = die revision
-YM2164s:
-05 83 C = hitachi
 </code>