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vendor:yamaha [2019/09/23 23:17] lord_nightmare fix old datecode format based on info from @ImATrackMan |
vendor:yamaha [2020/10/01 01:25] lord_nightmare new style 'A' datecode is almost certainly Yamaha's own Kagoshima Fab |
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| Line 18: | Line 18: | ||
| m = month (1-9 = Jan-Sep, X=oct, Y=nov, Z=dec) | m = month (1-9 = Jan-Sep, X=oct, Y=nov, Z=dec) | ||
| dd = day within month | 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': | ||
| Line 30: | Line 31: | ||
| ====== Fabs ====== | ====== Fabs ====== | ||
| - | |||
| - | 'old style' markings: | ||
| - | 1 = | ||
| - | 2 = Sharp? | ||
| - | 3 = | ||
| - | 4 (= L) = Hitachi 2 | ||
| - | 5 (= I) = Sharp | ||
| - | 6 = Hitachi | ||
| - | 7 = | ||
| - | 8 = Hitachi or ROHM (NDIP)? | ||
| - | 9 = | ||
| - | X = | ||
| - | Y = Hitachi? | ||
| - | Z = Fujitsu | ||
| 'new style': | 'new style': | ||
| - | A = Sharp 2 | + | A = Yamaha (Kagoshima) |
| C = Hitachi 2a | C = Hitachi 2a | ||
| D = | D = | ||
| Line 56: | Line 43: | ||
| L (= 4) = Hitachi 2 | L (= 4) = Hitachi 2 | ||
| O = | O = | ||
| - | Z = Fujitsu | + | Z = Fujitsu |
| ====== Chips ====== | ====== Chips ====== | ||