Doom was never officially released on the Amstrad, nor was it released on any other system of that time. Doom was just way beyond in computer development. Thankfully if you have the latest version of SymbOS however which has just been released for the MSX, Amstrad CPC, Enterprise and PCW. You can not only play the latest 8bit version of Doom converted by Prodatron, but many other games such as

Source and More information: SymbOS – A rather impressive Z80 multitasking operating system gets a new release