Intel 80386

PHYSICAL DESIGN AND DEBUGGING
PAGE
66,132
EQUATES
00C8
LATCH
EQU
OC8H
OOAA
GOOD SIGNAL
EQU
OAAH
0055
BAD_SIGNAL
EQU 055H
CODE TO VERIFY ABILITY
TO WRITE
AND READ RAM CORRECTLY
ASSUME CS: INITIAL CODE
0000
INITIAL_CODE
SEGMENT
FOOO
ORG
OFOOOH
FOOO -BB
0000
TST_LOOP:
MOV
BX, OOOOH
F003
8E
DB
MOV
OS, BX
F005
C7 07
5473
~IOV
[ax] ,
5473H
F009
C7 47
02 2961
MOV
[BX]+2, 2961H
FOOE EB 01
90
JMP
READ
Fall 81 3F
5473
READ:
CMP
[BX] , 5473H
F015
75 00
JNE
BADRAM
F017 81
7F 02 2961
CMP
[BX]+2,
2961H
FDIC 75 06
JNE
BADRAM
FOIE
BO AA
MOV
AL, GOOD SIGNAL
F020 E6 C8
OUT
LATCH, AL
F022 EB
DC
JMP
TST_LOOP
F024
BO 55
BADRAM:
~IOV
AL,
BAD_SIGNAL
F026 E6 C8
OUT
LATCH,
AL
F028
EB 06
JMP
TST
LOOP
FFFO
ORG
OFFFOH
FFFO E9
FOOD R
START:
JMP
TST LOOP
FFF3
INITIAL CODE
ENDS
END
Harning
Severe
Errors
Errors
a
a
Figure 11-13. Object Code for Diagnostic Program
11-16