GN_Gab, Get first alarm block
Register parameters
RST 20H, DEFW $7E09
IN: -
OUT, if call successful:
Fc = 0
BHL = first alarm block in list
OUT, if call failed:
Fc = 1
A = error code:
RC_Fail, no existing alarm list
Registers changed after return:
...CDE../IXIY same
AFB...HL/.... different
Notes
This is used by Alarm popdown to get the first alarm block and save alarms in a file. This system call is only available in OZ release V4.5 and newer.
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