Intel 80287, 80286 manual Tr E Q, Status Word Record Definition

PROGRAMMING NUMERIC APPLICATIONS

;RESERVE SPACE FOR STATUS WORD STAT ULW 0RD

;LAY OUT STATUS WORD FIELDS STATUS RECORD

	BUS Y:	1 ,
6	CoND_CoDE3:	1,
6	STACK_TOP:	3,
6	CoND_CoDE2:	1,
6	CoND_CoDE1:	1,
	CoND_CoDED:	1,
	IN T_R EQ :	1 ,
6	RESERVED:	1,
6	P_FLAG:	1,
	U_FLAG:	1,
	o_F LAG:	1 ,
	Z_FLAG:	1,
6	D_FLAG:	1,
6	LF LAG:	1
POLL STATUS WORD UNTIL 80287 IS NOT BUSY
POLL:	FNSTSW STATUS_WORD
	TEST	STATUS_WORD, MASK_BUSY
	HZ	POLL

Figure 2-4.Status Word RECORD Definition

SAMPLE	STRUC
LOBS	DD	SHORT	INTEGER
MEAN	DQ	LONG	REAL
MODE	DW	WORD	INTEGER
STD_DEV	DQ	LONG	REAL

;ARRAY OF OBSERVATIONS -- WORD INTEGER

TEST_SCORES DW 1000 DUP (?>

SAMPLE ENDS

Figure 2-5.Structure Definition

ADDRESSING MODES

80287 memory data can be accessed with any of the CPU's five memory addressing modes. This means that 80287 data types can be incorporated in data aggregates ranging from simple to complex accord- ing to the needs of the application. The addressing modes, and the ASM286 notation used to specify them in instructions, make the accessing of structures, arrays, arrays of structures, and other organi- zations direct and straightforward. Table 2-17 gives several examples of 80287 instructions coded with operands that illustrate different addressing modes.

2-42