Texas Instruments TI-86 graphing calculator.
Key Specifications & Features
Processor: 6 MHz Zilog Z80 microprocessor.
Memory: 128 KB of RAM (with roughly 96 KB available to the user).
Display: 128 × 64 pixel high-contrast monochrome screen.
Capabilities: Advanced calculus, linear algebra (matrices and vectors), complex numbers, and differential equations.
Programming: Supports TI-BASIC and assembly language (Z80).