Z88 Developers' Notes
Contents   Contents of System Calls

OS_Ploz, poll for running OZ

RST 20H, DEFW $C606

IN:

     A = slot number (0 to 3)
OUT, if call successfull:
     Fz = 0, OZ is running in slot
     Fz = 1, OZ is not running in slot.

OUT, if call failed:
     Fc = 1
          A = RC_ONF, no card found
Registers changed after return:
     A.BCDEHL/IXIY same
     .F....../.... different
Notes:
OZ can only run in slot 0 or 1. Using this call for slots 2 and 3 will always return Fz = 1.
This call is used internally by OZ  in the Flash card management sub-system, when it is necessary to turn off the screen during Flash hardware operations on the same card as a running OZ.

This system call is only available in OZ release 4.2 and newer.
Bugs:
     -
Related system calls: