Texas Instruments TI-36 is a series of scientific calculators distributed by Texas Instruments. It currently represents the high-end model for the TI-30 product lines. The TI-36 model designation began in 1986 as variant of TI-35 PLUS with solar cells. TI-35 Plus/TI-36 Solar (1986) It can display 10 digits mantissa with 2 digits exponent, and calculates with 12-digit precision internally. TI-36 SOLAR was based on 1985 version of TI-35 PLUS, but incorporates solar cells. It addition to standard features such as trigonometric functions, exponents, logarithm, and intelligent order of operations found in TI-30 and TI-34 series of calculators, it also include base (decimal, hexadecimal, octal, binary) calculations, complex values, statistics. Conversions include polar-rectangular coordinates (P←→R), angles. Other features include x-y exchange, percentage, register-current stack exchange, factorial, permutation/combination. Maximum open parenthesis level is 15, with 6 pending operation stacks. There are 2 operand registers (a, b) and 1 memory register. TI-35 PLUS uses Toshiba T7767 processor, while TI-36 SOLAR uses Toshiba T7768 processor. It was manufactured by Taiwanese company Inventec Corporation. 1989 TI-35 PLUS now uses Toshiba T7767S. Cosmetic changes include black shell. TI-36 SOLAR features smaller, more efficient solar cells, and cosmetic changes. The text "ANYLITE SOLAR" replaces "SCIENTIFIC" on the bottom right of the face. TI-35X/36X SOLAR (1991) The design was similar on the 1991 version of TI-68, but without programming features and tilt screen, and only uses 7-segment LCD display. The double shift keys are remained. Base calculations were updated to include logic operations (NOT, AND, OR, XOR, XNOR). Additional unit conversions include cm-in, litre-US gallon, kg-lb, Celsius-Fahrenheit, gram-ounce. There are 8 physical constants. Register count was increased to 3. New statistic modes include 2-variable statistics with linear regression. Other new features include cubic root, fraction mode display and conversion (pure/mixed). Complex function was removed. Stack levels are 15 open parentheses. TI-35X uses Toshiba T6A58S, and TI-36X SOLAR uses Toshiba T6A57 processor. 1993 It received cosmetic redesigns, which include rubber-like keys and rounder case. TI-36X Solar (1996) It received cosmetic redesigns, which include recolored keys and labels, rounder case, solid plastic button. The bare processor is now attached directly on motherboard. TI-35 was since then discontinued. TI-36 eco RS (1999) The design is based on 1996 version of TI-36X Solar, but was marketed to use recycled plastics for housing. TI-36X SOLAR (2004) It was a cosmetic redesign for 1996 model, with design theme found in 2004 BA II PLUS