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Hitachi Chips: HD37678B
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| Casio FX-17 |
| Make and number: | Hitachi HD37678B |
| Package: | 28 pin DIL, 0.6” width, black plastic |
| Known date codes: | 6D 11 |
| Known date of fabrication: | 1976 |
| Calculators: | above |
| Secondary ICs: | None |
| Power supply: | 6.0V |
| Display capability: | 8 digit + 1 (standard), 5/2 +2 (scientific), small zero notation. |
| Basic Functions: | Four standard plus CE/C |
| Constant: | Selectable by double hit on all multiply and divide only |
| Advanced functions: | Squares, square root, pi, sexagesimal input (not display), change sign, reciprocal. |
| Scientific functions: | Trigonometric and transcendental functions including powers. |
| Memory: | Four
function memory (MR/C) (M+) (M-) No indication of storage Memory overflow flags error and retains original value |
| Overflow states: |
Input overflow is suppressed |
| Overflow recovery: | None |
| Negative sign: | Far left (ninth) digit |
| Bugs: | Divide to negative zero once |
| Comments: | Early attempt at the classic Casio FX series with more functions than earlier models but still some limittations. Transcendental (logs) and trigonometric results are limited to five and occasionally six decimal places respectively. Power raising shows the intermediate step of using a log so that (2)(Xy) shows "0.6931474" then (8)(=) gives "256". Interestingly this is one digit of precision more than if you used the (ln) key. Scientific display is limited between 1039 and 10-39 and will overflow if the mantissa exceeds five digits. |