Z88 Developers' Notes
Contents   Contents of System Calls

OS_Vth, verify tri-handle

RST 20H, DEFW $E006

IN: 

     A = Tri-handle subtype
          TH_FILT ($F0), verify filter handle
          TH_WMG ($F1), verify wildcard manager handle
          TH_ALM ($F2), verify alarm handle
     IX = tri-handle
OUT, if call successfull: 
     Fc = 0, handle OK.
          B = Bank
          H = Adress of high byte
          L = Segment
OUT, if call failed: 
     Fc = 1
          A = RC_HAND, bad handle
Registers changed after return: 
     ...CDE../IXIY same
     AFB...HL/.... different
Notes:
Internal operating system usage.
Bugs:
 

Related system calls:

OS_Gth, get tri-handle
OS_Fth, free tri-handle