STPOUT - Reset read/write head n tracks

Syntax:

CALL 403EH

Input:

The drive must be powered on.
B = number of tracks

Exit:

The read/write head was reset the corresponding number of tracks.
DTRCK (IY+20) contains the new current track number.

Registers used:: AF, BC

Error handling:: none

The read/write head is reset by the number of tracks contained іп B, but up to track 0 at most.

Example:

...
DI                  ; disable interrupts
LD (IY+11),10H      ; select Drive 1
CALL 4008H          ; and turn on
LD BC,50            ; 50 ms delay
CALL 4038H
LD B,5              ; reset head 5 tracks
CALL 403EH
CALL 400BH          ; turn off drive
EI                  ; enable interrupts again
...