Editing Commodore 65 (section)

===DOS===
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In contrast to previous 8-bit computers from Commodore, the C65 has a complete DOS through which the built-in 3.5-inch floppy disk drive can be controlled. Disks used by the C65 have a storage capacity of 880&nbsp;KB and the drive is compatible with [[Commodore 1581|C1581]]. Since this format was uncommon for the former C64 owners, the C65 retains the serial IEC port for external Commodore disk drives. <!--The reminder??-->It's possible to use a [[Commodore 1541|1541]], [[Commodore 1571|1571]], [[Commodore 1581|1581]], or other similar model.

The DOS itself is based on the Commodore PET IEEE [[Commodore 8050|8250]] drive DOS. Since it can only deal with two floppy disk drives, including the internal, only one external drive may be connected to the internal floppy disk controller. Like earlier systems, up to four drives can be [[daisy chain (electrical engineering)|daisy-chained]] on the IEC port.