IBM AT 5170 Technical Reference page 220

IBM Person" COlllputer MACRO Assembler Version 2.00
1-21
TESTl ---- 06/10/55 POWER ON SELF TEST (POST) 06-10-85
2111
TEST. 12
2112 VERIFY CMOS CHECKSUM/BATTERY OK
2113 oESCR I PT I ON
2114 OETERM I NE IF CONF I G RECORD
2115
; CAN BE USED FOR INITIALIZATION.
2116
1------------------------------------- - -­
2111 ASSUME
os
I
DATA
2115 0689 E6 0000 E CALL DOS SET THE DATA SEGMENT
2119
2120 068C 80 16 MOV
AL,16H
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2121 068E E6 80
OUT MFG_PORT, AL
<><> CHECKPOINT 16 <><>
2122
2123 I S THE 8A TTERY LOW TH I S POWER UP?
2124
2125 06CO 80 60
MOV AL,CMOS REG O+NMI CHECK 8A TTERY CONO [T [ON
2126 06C2 E6 0000 E CALL CMOS READ - READ THE 8ATTERY STATUS
2121 06C5 A8 80 TEST
AL,100000008
[5 THE BATTERY LOW?
2128 06C1 14 08
JZ CMOS 1 A ERROR I F YES
2129
2130 06C9 80 8E MDV
AL,CMOS OIAG+NMI
GET THE OLD STATUS
2131 06C8 E6 0000 E
CALL CMOS READ FROM 0 I AGNOST [C STATUS 8YTE
2132 06CE A5 60
TEST AL,8AO 8AT HAS CUSTOMER SETUP BEEN EXECUTED?
2133 0600 14 15 JZ CMOS 1 - GO CHECK CHECKSUM IF YES
2134
2135 0602 E8 64
JMP
SHORT CMOS4 CONT I NUE WI THOUT CONF I GURAT I ON
2136
2131
SET DEFECTIVE 8ATTERY FLAG
2136
2139 0604 80
11
CMOSIA: MOV
AL,11H
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2140 0606 E6 80
OUT MFG_PORT ,AL
<><>
CHECKPOINT 11
<><>
2141
2142 0606 B6 SESE
MOV AX,X·1CMOS oIAG+NMI) CMOS
0
I AGNOS TIC ST ATUS BYTE
2143 060B E6 0000 E
CALL
CMOS READ -
GET THE CURRENT STATUS
2144 060E OC 60 OR
AL,8AD 8AT SET THE DEAD 8ATTERY FLAG
2145 06EO 66 C4 XCHG AL,AH -
SAVE
2146 06E2 E6 0000 E
CALL CMOS WR ITE OUTPUT THE STATUS
2141 06E5 EB 51
JMP SHORT CMOS4 GO TO MINIMUM CONFIGURATION
2148
2149
;----- VERIFY CHECKSUM
2150
2151 06E1 88 8E6E
CMOS I: MOV AX,X·'CMOS DIAG+NMI) CLEAR OLD STATUS
2152 06EA E6 0000 E
CALL
CMOS READ -
GET THE CURRENT STATUS
2153 06Eo 61 3E 0012 R 1234
CMP ORE SET FLAG, 1234H IS THI S A 50FT RESET
2154 06F3 15 04
JNZ CMOS
I_A
GO IF NOT
2155
2156 06F5 24 10
AND AL,W MEM SIZE CLEAR ALL BUT THE CMOS/POR MEMORY SIZE
2151 06F1 EB 02
JMP SHORT CMOS '_8
2158 06F9 CMOS! A:
-
2159 06F9 2A CO
SUB
AL,AL CLEAR STATUS IF POWER ON RESET
2160 06F8
CMOS! 81
2161 06FB fl6 C4 - XCHG
AL,AH SAVE THE CURRENT STATUS
2162 06FO E8 0000 E
CALL CMOS_WR I TE
2163
2164 0100 28 08
SUB 8X,8X
2165 0102 2B C9
SUB
CX,CX
2166 0104 Bl 90 MOV CL,CMOS 01 SKETTE+NMI SET START OF CMOS CHECKSUMEo AREA
2161 0106 B5 AE
MDV
CH,CMOS::::CKSUM_HI +NMI
SET END OF CMOS CHECKSUMED AREA + 1
2168
lFlRST 8YTE OF CHECKSUM)
2169 010fl flA Cl
CMOS2: MOl,'
AL,CL
2110 010A Ee 0000 E CALL
CMOS READ ADDRESS THE 8EGINNING
2111 0100 2A E4
SUB
AH,AH INSURE AH=O
2112 010F 03 De
ADD 8X,AX ADD TO CURRENT VALUE
2113 0111 FE C1
INC CL PO I NT TO NEXT 8YTE ADDRESS I N CMOS
2114 0113 3A E9
CMP CH,CL FINISHEO? IAT CHECKSUM BYTE HIGH)
2115 0115 15 FI
JNZ
CMOS2 GO IF NOT
211601110B08
OR
8X,8X
BX MUST NOT 8E 0
2117 011914 10 JZ
CMOS3
CMOS 8AO IF CHECKSUM=O
2118 011B BO AE
MOV
AL.CMOS CKSUM HI+NMI
GET THE CHECK SUM HIGH BYTE
2119 0110 E8 0000
E
CALL CMOS READ -
FIRST BYTE OF CHECKSUM
2180 0120 8A EO MOV
AH,AL SAVE IT
2181 0122 80 AF
MDV
AL,CMOS CKSUM LO+NMI SECOND BYTE OF CHECKSUM
2182 0124 E8 0000 E
CALL CMOS READ ­
2183 0121 38 C3
CMP
AX,BX I S THE CHECKSUM OK
2184 0129 14 00
JZ CMOS4 GO IF YES
2185
2186
; ----- SET CMOS CHECKSUM ERROR
2161
2188 0128 88 8E8E
CMOS3: MOV AX,X· (CMOS DIAG+NMI) ADDRESS DIAGNOSTIC STATUS
2189 012E Efl 0000 E
CALL
CMOS READ -
GET THE CURRENT STATUS
2190 0131 OC 40
OR AL,8AD CKSUM SET 8AD CHECKSUM FLAG
2191 013386 C4
XCHG
AL,AH -
SAVE IT
2192 0135 E8 0000 E
CALL CMOS_WR I TE
SET FLAG
2193
2194
1----- INSURE CMOS DIVIDERS SET
2195
2196 0138 CMOS41
2191 0138 88 flA8A
MOV AX,X·iCMOS REG A+NMI) ADDRESS CMOS REGI STER A
2198 013B E6 0000 E
CALL
CMOS READ - -
GET CURRENT DIVISORS
2199
onE
24 OF
AND
AL.OOFH LOOK AT PERIODIC RATE BITS
2200 0140 15 01
JNZ
CMOS9 EXIT IF SET TO SOMETHING USEFUL
2201
2202 0142 80 26 MDV
AL,26H
ELSE SET THE STANDARD DEF AULT USED 8Y
2203 0144 86 C4
XCHG
AL,AH BIOS FOR THE 916.56 US RATE
2204 0146 E8 0000 E
CALL CMOS_WR ITE FOR THE PER I 00 I C CLOCK
2205 0149 CMOS9 :
2206 0149 80 18
"DV
AL,IBH
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2201 0148 E6 80
OUT MFG_PORT ,AL <><> CHECKPD I NT 16 <><>
2208
2209
;- - - - - ENA8LE PROTECTED MODE
2210
2211 0140 E4 61
IN AL,PORT 8 DISABLE MEMORY AND I/O PARITY CHECKS
2212 014F OC OC OR
AL,RAM PAR OFF
2213 0151 E6 61
OUT PORT_B7AL ­
2214
221 S
SET RETURN ADDRESS 8YTE I N CMOS
2216
22110153B019
"OV
AL,!9H <> <> <> <> <> <> <><><> <> <><>
22180155 E6 80
OUT
MFG_PORT ,AL
<><>
CHECK PO I NT 19
<><>
2219
2220 0151 88 018F MOV AX, I ·H+ (CMOS SHUT DOWN+NM I ) ; SET THE RETURN ADDRESS FOR
2221 015A E8 0000 E
CALL CMOS_WRITE - - I THE FIRST SHUTDOWN RETURN ADDRESS
2222
2223 0150 8C 0000
MDV SP,POST SS ; SET STACK FOR SYSINIT1
2224 0160 BE 04
MDV
SS,SP ­
5-48
TEST1