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vendor:yamaha [2017/04/25 17:16] lord_nightmare lost one, fixed |
vendor:yamaha [2020/10/01 01:25] (current) lord_nightmare new style 'A' datecode is almost certainly Yamaha's own Kagoshima Fab |
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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: | ||
| + | |||
| + | [[vendor: | ||
| + | |||
| ====== Datecode ====== | ====== Datecode ====== | ||
| Line 9: | Line 15: | ||
| Yamaha Datecode/ | Yamaha Datecode/ | ||
| 1981-1989 'old style': | 1981-1989 'old style': | ||
| - | | + | |
| + | 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 | + | I (= 5) = Sharp (95% certain) |
| L (= 4) = Hitachi 2 | L (= 4) = Hitachi 2 | ||
| O = | O = | ||
| - | Z = Fujitsu | + | Z = Fujitsu |
| ====== Chips ====== | ====== Chips ====== | ||