IBM 5170 Technical Reference page 208

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[fI
00 J~\P
SHORT $+2 10 DELAY
OA28 E6 61
OUT
PORT B, AL
OA2A 24 F3 AND AL, RAM PAR ON
OA2C EB 00 JMP SHORT $+2 -
10 DELAY
OA2E E6
61
OUT PORT_B,AL
OA30
9D
POPF RESTORE FLAGS
OA31
7"5
29 JNZ SHUT4 CONT I NUE
; ------- CHECKSUM SYSTEM CODE
OA33 1 E
PUSH DS
OA34 06 PUSH ES SET SEGMENT TO TEST
OA35 1 F
POP
OS
OA36 2B DB
SUB BX, BX STARTING OFFSET
OA38 E8 0000 E
CALL
ROS CHECKSUM
OA3B 1 F POP
OS -
RESTORE DATA SEGF1[NT
DA3C
75 1 E JNZ
SHUT4
GO I F CHECKSUM NOT OK
ENABLE NM r AND
101
PAR CHECKS
OA3E BO 20
MOV
AL,2DH
ENABLE NM I
OA40 E6 70
OUT CMOS_PORT, AL
OA42 E4 61
IN
AL, PORT_B
ENABLE PAR I TY
OA44 EB 00
JI1P
SHORT $+2
10 DELAY
OA46 24 F3 AND AL, RAM PAR ON ENARI_E RAM PCK AND 10 CH
OA48 E6 61 OUT
PORT_B~AL
­
OA4A C7 06 0067 R 0003
MOV OS: rO_ROM_INIT,0003H
SET THE OFFSET
OA50 8C 06 0069 R
MOV
OS: 10_ROM_SEG, ES SET TilE SEGMENT
OA54 BO 42
, V
AL,42H
; <><><><><><><><><><><><><><>
OA56 E6 80
OUT MFG_PORT, AL
; <><><>CHECKPO I NT 42 <><><><>
EX I T TO SYSTEM CODE
OA58 FF lE 0067 R CALL DWORO PTR OS: I O_ROM_I NIT GO TO SYSTEM CODE
VIA CALL
;----- ENABLE NMI INTERRUPTS
+
ENTRY FROM SHUTDOWN WITH BOOT REQUEST
OA5C BO 20 SHUT4: MOV AL,2DH ENABLE NMI
OA5E E6 70 OUT CMOS_PORT, AL
OA60 E4 61 IN AL, PORT B ENABLE PARITY
0A62 EB 00 JMP SHORT
$+2
10 DELAY
OA64 24 F3 AND AL, RAM_PAR_ON ENABLE RAM PCK AND lOCH
OA66 E6 61
OUT
PORT~_I3,AL
OA68 BO 43 MOV AL,43H
; <><><><><><><><><><><><><><>
OA6A [6 80
OUT MFG_PORT,AL
; <><><>CHECKPO I NT 43 <><><><>
ENor F
OA6C CD 19
INT
19H ; GO TO BOOT LOADER
END IF
GA6E f'OST2 ENOl'
GA6E
CODE ENDS
END
5-66 Test 2