Sinclair ZX Spectrum 128 ("Toastrack")

Developed with Sinclair’s Spanish partner Investrónica and launched first in Spain in 1985, the ZX Spectrum 128 reached the UK in January 1986 as Sinclair’s last computer released under its own steam before the Amstrad takeover that same year. It’s the machine that brought the AY-3-8912 sound chip and 128 KB of RAM to the Spectrum line for the first time, along with RGB and MIDI/RS-232 output — all still through the original rubber-adjacent case shape, distinguished by the external heatsink running along its back edge that gave it the “Toastrack” nickname. The Amstrad-built +2 that followed later in 1986 carried the same 128K core into a new case with a built-in cassette deck.

Reference photo: Wikimedia Commons (“ZX Spectrum128K.jpg” by Bill Bertram), CC BY-SA 2.5.