The Spectrum was very popular and with the CPC having a much smaller market share, it made sense to develop the Spectrum version first and to save on time and money, the Spectrum code, music and graphics were re-used. (A typical port to the Amstrad is said to have been done in 3 days so was financially good).
This phenomenon was more prominent in the UK, where the Speccy was the dominant machine. In other markets, such as France of or Spain, where the CPC was very popular, games were coded from scratch for the CPC, often using an [[Atari|Atari ST]] for [[Games Crossdev|Cross Development]]
= Machine comparisons =