typedef struct {			// template for instruction

	UWORD lctr;				// location counter
	UWORD	instr_len;     // length of instruction
	UWORD opcode;			// instruction opcode/mode/register
	UWORD eff_add;			// value of operand 2
	UWORD	relocate;      // relocation bit
	UWORD pseudo;			// pseudo opcode

}  INSTRUCTION;



typedef struct {        // template for symbol table


	UBYTE	symbol[4];     // symbol name
	UWORD	lctr;			   // location of symbol

} 	SYMTAB;


typedef struct {

	UBYTE name[5];
	UBYTE val;

}  OPCODES;



typedef struct {

	UBYTE name[4];
	UBYTE val;

}  PSEUDO_OPCODES;



typedef struct {

	WORD r0;
	WORD r1;
	WORD r2;
	WORD r3;
	WORD pc;
	WORD sp;
	WORD zero;
	WORD neg;

}  CPU;