MTX512

The Memotech MTX512, released in 1984 as part of Memotech's distinguished MTX line, was a Z80A-based home computer featuring 64 KB of main RAM along with 16 KB of dedicated video RAM. Powered by a 4 MHz Zilog Z80A CPU and equipped with a TMS9929A/TMS9928A graphics chip, it delivered sharp 256×192-resolution imagery in up to 16 colors and supported 32 hardware sprites. Sound was provided by the SN76489A PSG chip with three tone channels and noise.

Housed in a robust aluminum chassis and paired with a full-travel 79-key mechanical keyboard, the MTX512 stood out for its industrial-grade build quality and styling. Connectivity was versatile: two joystick ports, cassette storage (at 2400 baud), RF and composite video outputs, Centronics printer interface, and an edge connector for expansion. A proprietary internal slot enabled accessories such as RS-232 boards or floppy disk controllers.

The MTX512 shipped with Memotech BASIC, an integrated assembler/disassembler, and "Noddy"—a hypertext-like card system akin to HyperCard, allowing interactive card-based programs. It also supported CP/M (via the optional FDX floppy expansion), which enabled software like WordStar and SuperCalc, pairing home computing with business productivity.

Although visually striking and technically capable, the MTX512 struggled to gain widespread market traction against rivals like the ZX Spectrum and BBC Micro. A planned bulk order from the Soviet Union fell through, contributing to Memotech's collapse in 1985. Despite limited commercial success, the MTX512 remains a sought-after collector's item—praised for its advanced features and stylish design.