Board 250449/250453 1551 Board 250449/250453 1551 Drive build for the Commodore 264 series uses an parallel interface (cartridge port) and there for 3 to 4 times faster than the 1541. Uses the same floppy layout as the 1541 (170Kb DOS2.6) Board images 1551 Board 1551 interface Board schematics 1551 Schema Drive 1551 Schema Interface (Paddle)