Aha!  He forgot 6^P as the original way to boot the disk.  Newbie.<p>The funny thing about the Apple ][ disk was that homing sequence itself.  It was aligning the head to track 0 by SLAMMING it against a metal backstop.  Primitive, but took very few opcodes to make it happen, especially since the apple disk format had no encoding in the tracks to tell the head where it was.<p>One of my first forays into 6502 assembly was copying that home routine off the card and changing the delay between pulses to the servo.  You could actually make music with that metal backstop if you made the delay small enough.