APPENDIX A

Structure definition to implement the Tierra virtual CPU. The complete source code for the Tierra Simulator can be obtained by contacting the author by email.

struct cpu {  /* structure for registers of virtual cpu */
    int   ax;  /* address register */
    int   bx;  /* address register */
    int   cx;  /* numerical register */
    int   dx;  /* numerical register */
    char  fl;  /* flag */
    char  sp;  /* stack pointer */
    int   st[10];  /* stack */
    int   ip;  /* instruction pointer */
    } ;