Fed 66 floppy disks 66 copies.

[C] X [S] 07 [I] X [S] 0B [A] X [S] 07

Send: [C] for calibrate [I] for insert [A] for accept disk [R] for reject disk

Receive, One byte: X for okay E for error ? for unrecognized by autoloader

Send: [S] for status

Receive, Two bytes: 07 for no disk in drive 0A or 0B for disk in drive

First Byte: If it is not zero then an error has occurred. 1, 3, 5, 7, 8, 9, B, D, or F indicate a disk jam 2 indicates that the input hopper is empty. 4 indicates that a command is out of sequence.

Second Byte: 0 through 7 indicate that there is no disk in the drive. 8, 9, A, B, C, D, E, or F indicate that a disk is in the drive. 0, 1, 4, 5, 8, 9, C, or D indicate that the hopper is not seated.

If there has been an error then you have to send a C for recalibrate to clear the error before the autoloader will accept further commands.