Texas Instruments TI-30

Brief History

In 1980 Texas Instruments announced the successor of the famous TI-30 which have been in production since 1976. The liquid crystal display used in this calculator decreased power consumption, the new IC allowed retaining memory contents upon power-off and adding some functionality (conversion of angles and computing factorials), but due to quick oxidation of the materials used in the Klixon-style keyboard made this model very unreliable. Keyboards made of conducting rubber used in japanese calculators had excellent abilities, so Texas decided to utilize this technology in the next generation of calculators. The cooperation between Texas and Toshiba made very reliable and comfortable calculators: the TI-30-III in 1984, and one year after the new TI-30, which have been in production for years.

Technical specifications

Manufacturer:	Texas Instruments (USA/Italy)
Mfg. date:	1985-89
Size:	7,1×13,4×1,1 cm
Weight (ready for operate):	63 g
Type:	scientific
Capacity:	8/5+2 digits (input/display) 11+2 digits (internal precision)
Operating logic:	AOS
CPU:	Texas Instruments CD4565AN2L
Registers:	3 standard (with saving the pending operation) 1 constant (with saving the pending operation) 15 bracket (with saving the pending operation) 1 memory (with aritmetic)
Features:	%calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation Sciscientific (exponential) notation Sqrsquare root x²square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) y^xraising to power n!factorial
Display:	8+1 digit LCD
Power:	2×LR44 button cell
Test results:	trigonometry:result of sin^-1(cos^-1(tan^-1(tan(cos(sin(60°)))))), reference value: 60. 60.019845215 exponential:result of 0.999¹⁶⁰⁰⁰⁰, reference value (first 14 digits): 3.0068804206375×10^-70 3.0069206E70

Pictures

TI-30

Inside of the TI-30