compatible machine; clone; workalike
Computing term for hardware or a system designed to be compatible with another, especially a clone of a well-known model such as an IBM PC.
この互換機はIBMのソフトウェアをそのまま動かせる。
This compatible machine can run IBM software as is.
At that time, many cheap PC clones were on the market.
クローン is a more direct loanword for 'clone', often used in biology or general copying, while 互換機 is a technical computing term.
Compound of 互換 (compatibility) and 機 (machine). A straightforward technical term formed from Sino-Japanese elements.