Combining the FO-DOS cartridge with an additional [[Standard Memory Expansions|Standard Memory Expansion]] expansion and an external [[DDI1]] disc drive would upgrade a CPC464 to a CPC6128.
Exact ROM content is unknown. It might be an original or modified, 664 or 6128, english or french BIOS ROM...? (being made in 1989 it probably has the newer french rom). From cpcrulez forum: Boot messages says "...v3 (1985)... basic 1.1"
== Pictures ==
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Image:NoPictureFO.pngDOS Cartridge (photo from mic-cpcrulez).jpg
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