# Commodore Peripheral Bus: Part 8: CBDOS

* history
	* Commodore C65, 1991, canceled
	* C64 successor
	* "Computer Based DOS"
* drives are not external computers any more
* floppy disk controller ("F011") on the computer's mainboard (not on the "classroom" version)
* built-in 3.5" drive
* optional external second drive
* DOS runs on main CPU
* IEC calls are going to CBDOS drive first, and if failure, to IEC

* is the second drive unit 9, or unit 8 drive 1? answer: unit 9.

