Boombox / Ghetto Blaster

The portable stereo radio-cassette recorder, the boombox, peaked between roughly 1977 and 1985. The archetype was Japanese, from Sharp, Panasonic, JVC and Sanyo, with twin speakers, a chrome-heavy front panel, a carrying handle and a cassette deck front and centre. Larger models ran on eight or ten D cells and weighed enough to be a genuine burden. By the mid-1980s it was not just an appliance but a cultural marker, permanently tied to hip-hop and to the idea of playing your music at everybody else.

Blaster is the Autobot communications officer, introduced in 1985 to counter Soundwave, and the character is written as extroverted where Soundwave is flat: he loves noise, he loves broadcasting, he deploys cassettes with enthusiasm rather than menace. The alt mode carries all of that. A boombox is a machine for being heard.

The Microchange original was a working radio, sold as 'Sound Warrior Radio Cassette Robo', and it came in more than one colour. Hasbro used the red version, recoloured the cassette door yellow and removed the radio function to bring the cost down. What survives is a large, satisfying chest-door mechanism that takes the Autobot cassettes (Steeljaw, Eject, Rewind, Ramhorn) exactly as Soundwave's does. The Japanese Twincast is a retooled Blaster with a double cassette deck.

Not Diaclone. Takara Microman 'Microchange' MC-21 Radi-Cassette Robo, marketed as 'Sound Warrior', 1983. The original was a functioning radio; Hasbro's Blaster used the red deco with a recoloured yellow cassette door and the radio function deleted.

Fan lore about these vehicles is unusually unreliable. Where a popular claim does not survive checking, it is recorded here rather than repeated.

• Some sources cite the Microchange catalogue number for the Radi-Cassette Robo differently; MC-21 is the most commonly given.