HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                  INT 21,44,7 / IOCTL,7 - Get Output Status


       AH = 44h
       AL = 07
       BX = handle


       on return
       CF = 0 if successful
          = 1 if error
       AX = error code if CF set  (see DOS ERROR CODES)
       AL = 00  if ready (files), or not ready (char devices)
          = FF  ready (files or char device)


       - indicates if a device or file is ready for output
       - files always return ready, character devices don't

Esc or Alt-X to exit int 21,44,7 Home/PgUp/PgDn/End ←↑↓→