Z88 Developers' Notes
Contents   Contents of System Calls

GN_Fab, free alarm block

RST 20H, DEFW $6A09

IN: 

     BHL = pointer to alarm block
OUT, if call successful: 
     Fc = 0
OUT, if call failed: 
     Fc = 1
     A = error code:
          RC_BAD ($04), bad alarm block, fatal error
Registers changed after return: 
     ...CDE../IXIY same
     AFB...HL/.... different
Notes:

Bugs:
 

Related calls:

GN_Aab, allocate alarm block
GN_Alp, process an expired alarm (internal OZ usage)
GN_Lab, link an alarm block into the alarm chain
GN_Uab, unlink an alarm block from the alarm chain
OS_Alm, alarm manipulation (internal OZ usage)