Int 69 Fn FF  - 10net V5.0 - Syssvc.com - Signal System Error              [N]

   AH = FFh

Return: never???
Desc:  displays "System Error" message and register dump, then halts system
Range: INT 60 to INT 7F, selected by configuration

Notes: the signature "SYSV" immediately before the interrupt handler serves
     as the installation check

See Also: AX=4001h,AH=49h