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| Calculators: Chips: Hitachi Vintage Integrated Circuits |
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The following page gives an in-depth description of the Hitachi ICs used in vintage calculators listed on this web site. Hitachi semiconductors were used extensively by Hitachi, Casio (and hence re-branded Boots), Sharp and Omron. They were also occasionally used by Decimo, Imperial, Lloytron, Olympia (Panasonic), Sperry (possibly redesigned Casio's) and many others. The Omron ICs were actually renamed but still retained the HD number.
There appears to be a linear numbering system but the switch between four and five digit ID numbers seems random to me. The date code used a {year}{month}{batch} system which used year "0" to progress into 1980.
The logic is conspicuous by the usual lack of overflow recovery (quite annoying when you have to clear the calculator and loose the residual result) and often present Negative Zero Bug.
Innovative functions like fractions, date calculations and remainder, allowed Casio to issue some pretty unique calculators. The double-operator invoked constant also appears to have been a typical innovation of Hitachi.
Hitachi means, literally, Rising Sun, which explains the sun-like logo that is so familiar to us all.
Notes: Red data is not personally verified by ownership and is information retrieved from other web sites.
| Hitachi HD3276P | 1972 | o | Hitachi HD36133 | 1976 | o | ||||||
| Hitachi HD32612P | 1974 | o | Hitachi HD36140 | 1977 | o | ||||||
| Hitachi HD3623 | 1974 | o | Hitachi HD37331 | 1976 | o | ||||||
| Hitachi HD3654 | 1974 | o | Hitachi HD3780 | 1977 | o | ||||||
| Hitachi HD3633 | 1975 | o | Hitachi HD37350 | 1977 | o | ||||||
| Hitachi HD36109 | 1976 | o | Hitachi HD37400 | 1976 | |||||||
| Hitachi HD36264 | 1975 | o | Hitachi HD37678B | 1976 | |||||||
| Hitachi HD36265 | 1976 | o | Hitachi HD38401 | 1977 | o | ||||||
| Hitachi HD36290 | 1975 | o | Hitachi HD38111A | 1979 | o | ||||||
| Hitachi HD3686 | 1975 | o | Hitachi HD38401A | 1985 | |||||||
| Hitachi HD3692 | 1975 | o |
| Make and number: | Hitachi HD32612P |
| Package: | 40 pin DIL, 0.6” width, black plastic |
| Known date codes: | 4G42 |
| Known date of fabrication: | 1974 |
| Calculators: | Casio 101-MR |
| Secondary ICs: | 1 x IC: Hitachi HD3596 4J24, 24 pin DIL 0.6" width |
| Power supply: | 6.0V |
| Display capability: |
10 digit + 1(symbol
cluster) |
| Basic Functions: | Four standard plus CE, C, Reverse Polish Notation logic. |
| Constant: | Double
operator invoked on multiply and divide only Dot on symbol cluster shows constant selected |
| Advanced functions: |
percentages, square root |
| Scientific functions: | None |
| Memory: | Four
function memory (MC) (MR) (M+) (M-) Indicator for memory storage “M” symbol |
| Overflow states: |
Input overflow is not
suppressed |
| Overflow recovery: | None |
| Negative sign: | Far left symbol cluster |
| Bugs: | Negative square roots allowed |
| Comments: | Early RPN chip which needs heavy support |
| Make and number: | Hitachi HD3623 |
| Package: | 42 pin DIL, 0.6” width, black plastic |
| Known date codes: | 4J21 |
| Known date of fabrication: | 1974 |
| Calculators: | Sharp EL-8002 |
| Secondary ICs: | None |
| Power supply: | 4.5V |
| Display capability: | 8 digit + 1 |
| Basic Functions: | Four standard plus CE, C |
| Constant: | Automatic on multiply and divide only |
| Advanced functions: | Percentages |
| Scientific functions: | None |
| Memory: | None |
| Overflow states: |
Input overflow is
suppressed |
| Overflow recovery: | None |
| Negative sign: | Far right (first) digit |
| Bugs: | Negative zero bug |
| Comments: | Odd far right symbols for negative and overflow indication |
| Make and number: | Hitachi HD3654 |
| Package: | 36 pin DIL, 0.6” width, black plastic |
| Known date codes: | 4K12 |
| Known date of fabrication: | 1974 |
| Calculators: | Casio Mini Memory |
| Secondary ICs: | None |
| Power supply: | 6.0V |
| Display capability: |
8
digit + 0, with display shift capability |
| Basic Functions: | Four standard plus CE, C |
| Constant: | None |
| Advanced functions: | Percentages, display shift |
| Scientific functions: | None |
| Memory: |
Switched
accumulation memory |
| Overflow states: |
Input
overflow is suppressed |
| Overflow recovery: | None |
| Negative sign: | Immediate left hand digit that disappears on overflow |
| Bugs: | None |
| Comments: | 16-digit precision displayed using the shift key (>) makes up for this simplistic early IC. |
| Make and number: | Hitachi HD3633 |
| Package: | 40 pin DIL, 0.6” width, black plastic |
| Known date codes: | 5B21 |
| Known date of fabrication: | 1975 |
| Calculators: | Lloyd's Accumatic 30 (EH-9036), Elite 3001, Decimo Vatman (black) |
| Secondary ICs: | None |
| Power supply: | 6.0V |
| Display capability: | 8 digit + single LED, but in the Decimo and Elite calculators it uses a 8+1 digit display to show minus and error signs. |
| Basic Functions: | Four standard plus CE, C |
| Constant: | Automatic on multiply and divide only |
| Advanced functions: | Percentages |
| Scientific functions: | None |
| Memory: |
None |
| Overflow states: |
Input
overflow is suppressed |
| Overflow recovery: | None |
| Negative sign: | Single LED (or ninth digit) |
| Bugs: | Negative zero bug |
| Comments: | Interesting to see this used in eight and nine digit display models. |
| Make and number: | Hitachi HD36109 |
| Package: | 36 pin DIL, 0.6” width, black plastic |
| Known date codes: | 6F11 |
| Known date of fabrication: | 1976 |
| Calculators: | Ibico 0892 |
| Secondary ICs: | None |
| Power supply: | 3.0V |
| Display capability: |
8
digit + 1 normal mode |
| Basic Functions: | Four standard plus CE/C |
| Constant: | Automatic on all four functions |
| Advanced functions: | change sign, pi, register exchange, reciprocal, square root |
| Scientific functions: | Trigonometric functions, transcendental functions, DMS input, switched DR mode and exponents. |
| Memory: |
Three
function memory (MC) (MR) (M+) |
| Overflow states: |
Input
overflow is suppressed |
| Overflow recovery: | Overflow is recoverable using (CE), other error states are not |
| Negative sign: | Far left (ninth) digit shows upper segment “-“ whilst third digit shows normal “-“ for exponents |
| Bugs: | tbd |
| Comments: | Number input from the left hand side |
| Make and number: | Hitachi HD36264 |
| Package: | 28 pin DIL, 0.6" width black plastic |
| Known date codes: | 5K13 |
| Known date of fabrication: | 1975 |
| Calculators: | Canon LD-8M2 |
| Secondary ICs: | None |
| Power supply: | 3.0V |
| Display capability: | 8 digit + 1 |
| Basic Functions: | Four standard plus CE, C |
| Constant: | Automatic on multiply and divide |
| Advanced functions: | Percentages, Square root |
| Scientific functions: | None |
| Memory: | Four function (MC) (MR) (M+) (M-) Memory store indicated by double line on 9th digit |
| Overflow states: | Input
overflow is suppressed Overflow shows result and "E" in 9th Zero divisor shows zero and "E" in 9th Negative square roots show result and "E" in the 9th |
| Overflow recovery: | None |
| Negative sign: | Shown in the 9th (far left) digit |
| Bugs: | None |
| Comments: | Robust but lacks recovery |
| Make and number: | Hitachi HD36265 |
| Package: | 24 pin DIL, 0.6” width, black plastic |
| Known date codes: | 6B43 |
| Known date of fabrication: | 1976 |
| Calculators: | Imperial 91S |
| Secondary ICs: | None |
| Power supply: | 6.0V |
| Display capability: | 8 digit + 1 |
| Basic Functions: | Four standard plus CE, C |
| Constant: | Automatic on all four functions |
| Advanced functions: |
percentages,
sign change, register exchange, pi, square root |
| Scientific functions: | None |
| Memory: |
Four
function memory (MC) (MR) (M+) (M-) |
| Overflow states: |
Input
overflow is suppressed |
| Overflow recovery: | None |
| Negative sign: | Far left (ninth) digit shows “-“ |
| Bugs: | tbd |
| Comments: | |
| Make and number: | Hitachi HD36133 |
| Package: | 28 pin DIL, 0.6” width, black plastic |
| Known date codes: | 6G31 |
| Known date of fabrication: | 1976 |
| Calculators: | Casio AL-8S |
| Secondary ICs: | None |
| Power supply: | 3.0V |
| Display capability: | 8 digit + 0 |
| Basic Functions: | Four standard plus CE, C |
| Constant: | Double operator invoked on all four functions |
| Advanced functions: | Percentages, square root, fractions, dates and remainder Switched fixed decimal point (float/cut/round 2 digit) |
| Scientific functions: | None |
| Memory: |
Accumulating memory with
five functions (MC) (MR) (M+) (M-) and (GT) for grand total |
| Overflow states: |
Input overflow is
suppressed |
| Overflow recovery: | None |
| Negative sign: | Immediate left digit but no ninth to travel into |
| Bugs: | Negative zero bug |
| Comments: | Date functions are not Y2K compliant. Interesting extra functions and one of the first fraction ICs. |
| Make and number: | Hitachi HD37331 |
| Package: | 28 pin DIL, 0.6” width, black plastic |
| Known date codes: | 6G13 |
| Known date of fabrication: | 1976 |
| Calculators: | Sharp EL-8018, EL-201 |
| Secondary ICs: | None |
| Power supply: | 3.0V |
| Display capability: | 8 digit + 1 |
| Basic Functions: | Four standard plus CE/C |
| Constant: | Automatic on multiple and divide only |
| Advanced functions: | Percentages, square root, sign change |
| Scientific functions: | None |
| Memory: |
One function memory (T),
auto accumulation on (=) key |
