Inside SYS code segment, on addresses 0239-024B is a list of interrupts whose vectors are saved and modified during initialization and restored on exit whether it was a normal termination or due to a runtime error.
SYS0230: 00 02 1B 21 23 24 34
SYS0240: 35 36 37 38 39 3A 3B 3C-3D 3E 3F 75