Commodore 2030/2040 Dual Floppy File Controller, DOS v2.1 Posted on February 28, 2020 by Martin Sørensen ROM listing for Commodore 2030/2040 Dual Floppy File Controller (6502), Disk Operating System Version 2.1. Corresponds to MOS 6332 ROMs #901486-11,-12 and -13. Thanks to Ove Mejlgaard.