What calculators have been recalled?
I am not aware of any formal recalls of any calculators sold to consumers. However, because of algorithm bugs in the embedded ROMs, calculator manufacturers have been known to repair/replace a calculator with the bug. Early HP-35 calculators, manufactured by Hewlett-Packard had a bug with the exponent (ex) function. HP offered to repair any calculators with the bug, and many owners did return their HP-35 for repair. Now, an HP-35 with the ROM bug is fairly collectable. In 2000, Texas Instruments offered to replace new models of the TI-30X IIS, TI-30X IIB, TI-34 II, and TI-40 College II calculators after a ROM bug affecting functions which utilized logarithms was discovered. The replacement offer expired January 31, 2001. The text of the notice can be read here. (This notice was removed from TI’s web pages shortly after the replacement offer expired.) The above should not be interpreted to suggest that only HP and TI have had ROM bugs. Many other calculators, including modern calculator