INT E0 - PCROBOTS v1.41 - "GET_SHELL_STATUS" - FIND OUT WHAT HAPPENED TO SHELL
AX = 0023h
Return: BX = status of last shell to land
0000h missed completely
0001h hit a wall
0002h hit a robot within 50-square radius
0003h hit a robot within 25-square radius
0004h hit a robot within 5-square radius