IBM 5170 Technical Reference page 286

0021 SA EO
MOV AH,AL SAVE PARITY STATUS
0023 75 03 JNZ NMI 1
0025 E9 00C1
R
JMP 014-
NO, EXIT fROM ROUTINE
0028 NMI 1:
;--=----
GET THE SWITCH SETTINGS
0028 BO AD MOV AL,DIS KBD
o
I SABLE THE KEYBOARD
002A E8 0000 E CALL C8042 -
0020 E4 60 IN AL, PORT A FLUSH
002F BO CO MOV AL, READ::8042_1 NPUT GET THE SW ITCH SETT I NGS
0031 E8 0000 E CALL C8042 I SSUE THE COMMAND
0034 E8 0000 E CALL OBf 42 WAIT fOR OUTPUT BUff FULL
0037 E4 60 IN AL, PORT_A GET THE SW ITCH
0039 E6 80 OUT MfG_PORT, AL SAVE SWI TCH
003B
BA ---­ R MOV OX, DATA
003E 8E DA
MOV OS, OX
0040 BE 0000 E MOV SI,OffSET 01 ADoR Of ERROR MSG
0043 F6 C4 40 TEST AH,40H I/O PARITY CHECK
0046 75 03 JNZ NMI 2
o
I SPLAY ERROR MSG
0048 BE 0000 E MOV SI,OffSET 02 MUST BE PLANAR
004B
004B
B4 00 MOV AH,O I
NIT AND SET MODE fOR V IDEO
0040
AO 0049
R
MOV AL,CRT_MOoE
0050
CD 10
I NT 10H
CALL VIDEO 10 PROCEDURE
0052 E8 0000 E CALL P MSG , PR I NT ERROR MSG
; ----­ SEE If LOCAT I ON THAT CAUSED PARITY CHECK CAN BE fOUND
0055 BO ff MOV AL,OffH MASK TRAP
0057 E6 70 OUT CMOS PORT, AL
0059 E4 61 IN AL, PORT_B
005B EB 00 JMP SHORT $+2
10 DELAY
0050 DC DC OR AL, RAM_PAR_Off TOGGLE PAR I TY CHECK ENABLES
005F
E6 61
OUT PORT_B,AL
0061
EB 00 JMP SHORT $+2
; 10 DELAY
0063 24 F3 AND AL, RAM_PAR_ON
0065
0067
E6 61
8B lE 0013 R
OUT
MOV
PORT B,AL
BX, MEMORY_S I ZE
GET MEMORY SIZE WORD
006B FC
ClO
SET 0 I R FLAG TO I NCR I MENT
006C 2B 02
SUB OX, OX
PO I NT OX AT START Of MEM
006E NMI LOOP:
006E 8E OA MOV OS, OX
0070
8E C2 MOV
ES,DX
0072 B9 8000
MOV
CX,4000H*2
SET FOR 64KB SCAN
0075 2B f6 SUB SI,SI
SET SI TO BE REALTIVE TO
START Of ES
0077 f3/ AD REP LOOSW READ 64KB Of MEMORY
0079 E4 61
IN AL, PORT_B
SEE I f
PAR I TY CHECK HAPPENED
007B 86 C4 XCHG AL,AH
SAVE PARITY CHECK
0070 81 FA 4000 CMP DX,4000H
CHECK fOR END Of Of fiRST 256K
0081 72 OC
JB
NMI_3
0083
0087
81 FA 8000
73 OC
CMP
JAE
OX,8000H
NMI
4
CHECK ABOVE 512K
CHECK fOR 10 CHECK
0089 E4 80 IN AL,MFG_PORT GET THE SWITCH SETTINGS
008B A8 10 TEST AL, BASE_RAM CHECK fOR 2ND 256K ON PLANAR
0080 74 06
JZ
NMI_4
GO I f NOT
008f
0092
F6 C4 80
EB 04 90
NMI_3: TEST
JMP
AH, PRTY_CHK
NMI
5
CHECK FOR PAR I TY ERR
CONT I NUE
0095 f6 C4 40 NMI_4: TEST AH,
To
CHK
TEST fOR 10 ERROR
0098 75 11 NM 1_5: JNZ PRT_NMI
GO PRINT ADDRESS If IT DID
009A 81 C2 1000 ADD OX,1000H PO I NT TO NEXT 64K BLOCK
009E 83 EB 40 SUB BX,160*4
OOAl 75 CB
JNZ
NMt LOOP
00A3
OOM
BE 0000 E
E8 0000 E
MOV
CALL
SI,(OffSET D2A)
P_MSG
PRINT ROW OF 11111 If PARITY
CHECK COULD NOT BE RE-CREATED
00A9 fA Cli
OOAA F4
HlT
HALT SYSTEM
OOAB
OOAB
OOAD
8C DA
E8 0000 E
PRT NMI:
- MOV
CALL
DX,DS
PRT SEG PR I NT SEGMENT VALUE
OOBO BO 28
MOV AL, T(' PRINT (S)
00B2 E8 0000 E
CALL PRT HEX
00B5 BO 53 MOV
AL TS'
00B7 E8 0000 E CALL PRT HEX
OOBA BO 29
MOV
AL, T)'
OOBC E8 0000 E CALL PRT_HEX
OOBf fA Cli
HALT SYSTEM
OOCO f4
HlT
OOCl
014:
OOCl BO 8f
MOV AL,8fH TOGGLE NM I
00C3 E6 70 OUT
CMOS PORT, AL
00C5 EB 00
JMP
SHORT $+2
10 DELAY
00C7 BO OF MOV AL,OFH
00C9 E6 70
OUT
CMOS_PORT, AL
OOCB 58
POP AX
RESTORE OR I G CONTENTS OF AX
OOCC CF
IRET
OOCD
NMI INT 1 ENOP
PAGE -
;
-­ --­ ---­ -­ ---­ -
-- --­
--­ --­ --­ ---­
--- -- ­
--­ --­ ---­ --­ ---­
--­ -
--­
THIS ROUTINE INITIALIZES THE TIMER DATA AREA IN THE
ROM BIOS DATA AREA. IT IS CALLED BY THE POWER ON
ROUTINES, IT CONVERTS HR:MIN:SEC FROM CMOS TO TIMER
TICS. IF CMOS IS INVALID, TIMER DATA IS SET TO ZERO.
;
---------------------------------------------------------------­
INPUT NONE PASSED TO ROUT I NE BY CALLER
CMOS BYTES USED fOR SETUP
00 SECONDS
02 MI NUTES
04 HOURS
OA REGISTER A (UPDATE IN PROGRESS)
DE CMOS VAll 0 I f ZERO
OUTPUT
TIMER LOW
i :~~~::~~~H
ALL REG I STERS UNCHANGED
b~~N;;-;~~------~QU-----~8-----------------------------------------------
=
0012
= 0444
COUNTS=M I N EQU 1092
=
0007
COUNTS HOUR EQU 7 ; 65543 - 65536
=
0070
CMOS ADR EQU 70H
=
0071
CMOS::DATA EQU 71 H
=
OOOE
CMOS_VALID EQU OEH
= 0000
CMOS_SECONDS EQU OOH
=
0002
CMOS_MI NUTES EQU 02H
= 0004
CMOS_HOURS EQU 04H
::: OOOA CMOS REGA EQU OAH
::: 0080
UPDATE T I MER EQU 80H
OOCO
SET_TOO PROC NEAR
PUSHA
5-144 BIOS