PWRON - Turn on a drive

Syntax:

CALL 4008H

Input

DK (IY+11) in the DOS vectors = Drive identifier

X’10’ = Drive 1

X’80’ = Drive 2

Exit:

none

Registers used:

A

Error handling:

none

The drive selected in DK will be powered on. The drive motor runs and the red LED on the front of the drive lights up.

You should wait a few milliseconds for the rotation speed to stabilize before accessing this drive.

Example:

...
...
DI              ; disable interrupts
LD A,80H        ; select Drive 2
LD (IY+11),A    ; test
CALL 4008H      ; turn on the drive
LD BC,50        ; 50 ms delay
CALL 4038H
...
...

Drive 2 turns on, then the program waits 50ms for stabilization.