User's Manual

PROGRAMMING NUMERIC APPLICATIONS
; RESERVE SPACE FOR STATUS WORD
STAT U LW 0 R D
;
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 E Q : 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
SAMPLE
LOBS
MEAN
MODE
STD_DEV
STRUC
Figure 2-4. Status Word RECORD Definition
DD SHORT INTEGER
DQ LONG REAL
DW WORD INTEGER
DQ LONG REAL
; ARRAY OF
TEST_SCORES
OBSERVATIONS -- WORD INTEGER
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.
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