Calculator calculator marketed to the Real Estate industry with preprogrammed functions to simplify the process of calculating payments and future values. In 1985, CI launched a calculator for the construction industry called the Construction Master which came preprogrammed with common construction calculations (such as angles, stairs, roofing math, pitch, rise, run, and feet-inch fraction conversions). This would be the first in a line of construction related calculators. The first desktop "programmable calculators" were produced in the mid-1960s by Mathatronics and Casio (AL-1000). These machines were very heavy and costly. The first programmable pocket calculator was the HP-65, in 1974; it had
Programmable calculator now available. It is installed via a cable or IrDA connection with a computer. RPL is a special Forth-like programming language used by Hewlett- Packard in its high range devices. The first device with RPL calculator was the HP-28C released in 1987. The language PPL was introduced with the HP Prime calculator and is much like Pascal An on-board (i.e. right on the calculator) assembler for TI 89 and related calculators was announced and released in 2014. Machine language programming was often discouraged on early calculator models; however, dedicated platform hackers discovered ways to bypass the built-in interpreters on some