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One important feature of programmable calculators is the availability of some form of persistent memory. Without persistent memory, programs have to be re-entered whenever power is lost, making the device cumbersome. Persistent memory can be internal or on a separate device. Some programmable calculators employ both schemes.
Sharp programmable calculators (40 P) SwissMicros calculators (20 P) T. Texas Instruments programmable calculators (31 P) W. Wang Laboratories (7 P)
The TI-59 is an early programmable calculator, that was manufactured by Texas Instruments from 1977. It is the successor to the TI SR-52, quadrupling the number of "program steps" of storage, and adding "ROM Program Modules" (an insertable ROM chip, capable of holding 5000 program steps).
The FX-501P and FX-502P were programmable calculators, manufactured by Casio from 1978/1979. [citation needed] They were the predecessors of the FX-601P and FX-602P.It is likely that the FX-501P/502P were the first LCD programmable calculators to be produced as up until 1979 (and the introduction of the HP-41C) no manufacturer had introduced such a device.
Another early programmable desktop calculator (and maybe the first Japanese one) was the Casio (AL-1000) produced in 1967. It featured a nixie tubes display and had transistor electronics and ferrite core memory. [31] The Monroe Epic programmable calculator came on the market in 1967. A large, printing, desk-top unit, with an attached floor ...
The Sinclair Scientific Programmable, released a year later, was advertised as the first budget programmable calculator. Significant modifications to the algorithms used meant that a chipset intended for a four-function calculator was able to process scientific functions , but at the cost of reduced speed and accuracy.
The TI-86 is a programmable graphing calculator introduced in 1996 which was produced by Texas Instruments.The TI-86 uses the Zilog Z80 microprocessor.It is partially backwards-compatible with its predecessor, the TI-85.
The HP-67 is a magnetic card-programmable handheld calculator, introduced by Hewlett-Packard in 1976 at an MSRP of $450. [1] A desktop version with built-in thermal printer was sold as the HP-97 at a price of $750. [2]