Vintage Calculator Semiconductors

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Sharp
EL-1103

Make and number:	Hitachi HD37400
Package:	42 pin DIL, 0.6” width, black plastic
Known date codes:	6D 31
Known date of fabrication:	1976
Calculators:	above
Secondary ICs:	None
Power supply:	3.0V
Display capability:	10 digit + 1
Basic Functions:	Four standard plus CE/C
Constant:	Automatic on all four functions
Advanced functions:	Percentages, mark-up/down, square root, change sign, total count Switched F/4/2/A fixed decimal function
Scientific functions:	None
Memory:	Four function memory (MR/C) (M+) (M-) Indication of storage by spare decimal point Memory overflow shows no error and stores shifted result
Overflow states:	Input overflow is not suppressed Overflow shows result and “C” or “E” in eleventh digit Zero divisor shows zero and “C” in eleventh digit Negative square root shows result and “E” in eleventh digit
Overflow recovery:	Input overflow only on second entry All others recoverable using (C/CE)
Negative sign:	Eleventh digit
Bugs:	Divide to negative zero once
Comments:	Useful 10 digit calculator with mark-up and total count of (=) keys (cleared by pressing it twice). Only let down by lack of recovery on first input overflow and strange memory overflow state (or lack of it).