INT 21 - FlashTek X-32VM - SET EXCEPTION HANDLER VECTOR
AX = 2533h
CL = exception number (00h-0Fh)
DS:EDX = CS:EIP of new exception handler
Return: CF clear if successful
CF set on error (CL > 0Fh)

See also: 212532

212533 - FlashTek X-32VM - SET EXCEPTION HANDLER VECTOR