在DEBUG状态下，显示中断向量表，找一个空闲的中断类型号，以此软中断作为新增加的系统调用中断。编制一个系统调用服务与初始化程序syscall.asm，要求包括以下两部分内容：① 系统调用服务例程；② 初始化程序：设置新的中断向量和驻留新增加的例程。编制一个用户程序user.asm，其目的是检测新增加的功能调用是否成功。在DEBUG状态下：① 查找中断向量表中新增加的系统调用的中断向量；② 显示扩充的中断服务例程；③ 找到该中断服务例程中使用的数据区。-In DEBUG mode, the display interrupt vector table, to find a free interrupt type number, as soft as a new increase in interruption of system calls interrupted. The preparation of a system call service and initialization procedures syscall.asm, the requirements include the following contents of the two parts: ① system call service routine　② initialization procedure: set new interrupt vector and the presence of new routines. The preparation of a user program user.asm, its aim is to detect newly added function call was successful. In the state DEBUG: ① Find Interrupt Vector Table in the new system call interrupt vector　② show expanded interrupt service routine　③ find the interrupt service routine used in the data area.