Currah

The Currah μSource, commonly referred to as the Microsource, from Quadhouse is a self-contained ROM cartridge with a full-function-two-pass macro assembler, Forth and a debugger, all of which can interact with BASIC.

[3] The Currah μSpeech, commonly referred to as the Microspeech,[4] plugged into the expansion port on the back of the ZX Spectrum.

The TV aerial lead plugged into the unit and speech sounds were added into the UHF signal generated by computer.

It also contained a clock for clear speech and an audio modulator to transfer the sound to the TV lead.

[6] DK'Tronics continued to manufacture the MicroSpeech unit, and many of their software titles (such as Maziacs and Zig Zag) supported it.