INT 21 - European MSDOS 4.0 - HARD ERROR PROCESSING
AH = 95h
AL = new state
00h enabled
01h disabled, automatically fail hard errors
Return: AX = previous setting
Desc:   specify whether hard (critical) errors should automatically fail the
system call or invoke an INT 24

See also: 24

2195 - European MSDOS 4.0 - HARD ERROR PROCESSING