Memotech

Memotech provides communication services, founded by Geoff Boyd and Robert Branton in Witney in Oxfordshire, England. They started out during the early 1980s producing memory expansion packs ("RAMpacks") and other hardware expansions for the Sinclair ZX81. 
However, they eventually went on to develop and sell their own MTX family of computers in 1983. The range included the following models: MTX500, MTX512 and RS128. The MTX 512 was based on the Zilog Z80 processor.
Although well-regarded, these computers were not commercially successful, and the company went into receivership in 1985.
Robert Branton had left the company in 1985 as the financial situation deteriorated and when Memotech Limited folded, Geoff Boyd acquired the assets of the old company and re-launched the company as Memotech Computers Limited in February 1986. Boyd continued to market and support the MTX500, MTX512 and RS128 with the final MTX computer, the MTX512S2 being released late in 1986.