XM7 is the X11 based emulator of FM-7, which was the very popular personal computer in Japan at 8-bits age. It has a built-in ROM BASIC, two M6809 microprocessors, and many other good features. It was produced by FUJITSU LIMITED. You must own a real machine and make required ROM files from it to run FM-7 software on it. But it'd be rather difficult in these days.