Vintage Calculator Semiconductors - Hitachi HD36290

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Hitachi Chips: HD36290

Vatman Vantage

Decimo Vatman Vantage

Unitrex Executron 830

Alco Alcor 888

Unknown 1000PR

Texet Pocket-8
1975

Make and number:	Hitachi HD36290
Package:	28 pin DIL, 0.6” width, black plastic
Known date codes:	5K51, 5K41, 5K11, 5B21
Known date of fabrication:	1975
Calculators:	Sharp EL-8011, Canon LD81, Mintron 832ND
Secondary ICs:	None
Power supply:	6.0V and 4.5V and 3.0V
Display capability:	8 digit + 1
Basic Functions:	Four standard plus CE, C
Constant:	Automatic on multiply and divide only
Advanced functions:	Percentages, square root, change sign (though each calculator above has a different selection of these)
Scientific functions:	None
Memory:	None
Overflow states:	Input overflow is suppressed Overflow shows result and “C” or “E” in ninth digit Zero divisor shows zero and “C” in ninth digit Negative square root shows result and “E” in ninth digit
Overflow recovery:	None
Negative sign:	Ninth digit
Bugs:	Negative zero bug, divide to negative zero once
Comments:	The above range of calculators do not have all the functions, some have the change sign some the square root. Basic 1975 chip that needs a lot of components to support it and suffers from lack of recovery and negative zero bugs.