Development machine

Before the prototype and production models was the original development machine consisting of over 75 discrete logic chips wire-wrapped which would later become the ASIC

The sound chip in the development machine was an AY-3-8912 like the ZX Spectrum 128, which was later replaced by the SAA1099.

Pictures from Crash Issue 50 March 1988 & Crash Issue 61 February 1989, courtesy of spectrumcomputing.co.uk