Z88 Developers' Notes
Contents   Contents of System Calls

OS_Ht, hardware time manipulation

RST 20H, DEFW $F206

IN: 

     A = HT_RES ($01), reset hardware timer
     A = HT_RD ($02), read hardware timer
     HL = pointer to a 5 byte buffer
OUT: 
     -
Registers changed after return: 
     A.BCDEHL/IXIY same
     .F....../.... different

IN: 
     A = HT_MDT ($03), read monthy/date/time address
OUT: 
     Fc = 0
     BHL = month, date, time address
Registers changed after return: 
     ...CDE../IXIY same
     AFB...HL/.... different
Notes:
Internal operating system usage.
Bugs: