Sega Master System / Mark III / Game Gear
The ROM image contains bits of Z80 source code in ASCII format. It is presumed that the assembler used to create the final build didn't clear out unused memory and thus the sources are left over from the assembling phase or from a text editor.
The only differences between the Image Works and Virgin Games versions of Xenon 2 are within the ROM header and the data for the publisher's logo screen.
In the ROM header, the two ROMs have different product codes (IW: 27012, VG: 27038) and different version numbers (IW: 0, VG: 1).
The publisher screen is completely different between the two versions:
Researched by Bock, Paul Baker