Int 14 Fn 4004  - I1541 - Send Listen Signal                               [t]

   AX = 4004h
   BH = device number (0..15)

Return: CF clear if successful
   CF set on error
       AL = error number (see #0280)

See Also: AX=4005h,AX=4006h

(Table 0280)
Values for I1541 error number:
 00h   device not present
 01h   listener not ready
 02h   missing EOI time-out
 03h   EOI not completed
 04h   data not released
 05h   frame error