IBM
Personal
Computer
MACRO
Assembler
Version
2.00
POST
-----
01/10/86
SYSTEM POST AND
BIOS
PROCEDURES
1-19
01-10-86
19A5
ERR_BEEP
PROC NEAR
19A5
9C
PUSHF
SAVE
FLAGS
19A6
FA
CLI
oI
SABLE
SYSTEM
INTERRUPTS
19A1
OA
F6
OR
DH,DH
ANY LONG ONES TO
BEEP
19A9
14
IE
JZ
G3
NO,
DO
THE SHORT ONES
19AB
Gl
:
LONG
BEEPS
19AB
B3
10
MOV
BL,112
COUNTER FOR LONG
BEEPS
(1-3/4
SECONDS}
19AD
B9
0500
MOV
CX,1280
oI V I
SOR
FOR
932
HZ
19BO
E8
OC5C R
CALL
BEEP
DO
THE
BEEP
19B3
B9
C233
MOV
CX,49115
2/3
SECOND
DEL
AY
AFTER
LONG
BEEP
19B6
E8
OCAO
R
CALL
WAITF
DELA
Y BETWEEN
BEEPS
19B9
FE
CE DEC DH ANY MORE LONG
BEEPS
TO
DO
19BB
15
EE
JNZ
Gl
LOOP
TILL
DONE
19BD
IE
PUSH
OS
SAVE
OS
REG I STER CONTENTS
19BE
E8
lA12
R
CALL
DDS
19C1
80
3E
0012
R 01
CMP
OMFG_
TST
, 0 1H
MANUFACTURING
TEST
MODE?
19C6
IF
POP
OS
RESTORE
OR
I GI
NAL
CONTENTS OF
(OS}
19C1
14
BD
JE
MFG_HALT
YES - STOP
BLINKING
LED
19C9
G3:
SHORT
BEEPS
19C9
B3
12
MOV
BL,18
COUNTER FOR A SHORT
BEEP
(9/32)
19CB
B9
04B8
MOV
CX,1208
DIVISOR
FOR
981
HZ
I
9CE
E8
OC5C R
CALL
BEEP
DO
THE SOUND
TH
IS
SUBROUTJ NE
WILL
PR I
NT
A MESSAGE
ON
THE
0 I
SPLAY
PUT
CHAR I N
AL
PO I
NT
TO
NEXT
CHAR
SAVE PR I
NT
CHAR
CALL
VIDEO
10
RECOVER
PRINT
CHAR
WAS
IT
LI
NE
FEED?
;
NO,KEEP
PRINTING
STRING
YES -
HAL
T SYSTEM
RECOVER ERROR I
NO
I
CA
TOR
SET
INTO
8255
REG
HALT
SYS
SET
BP
NON-ZERO
TO
FLAG
ERR
PR I
NT
MESSAGE
PR I
NTER
SOURCE
TABLE
SAVE FOR
LOW
NIBBLE
0 I
SPLA
Y
SHIFT
COUNT
NYBBLE
SWAP
DO
THE
HIGH
NIBBLE
0 I
SPLA
Y
RECOVER
THE
NIBBLE
I SOLA
TE
TO
LOW
NibBLE
F
ALL
I NTO
LOW
NIBBLE
CONVERS I
ON
CONVERT
OO-OF
TO ASC I I CHARACTER
ADD
FIRST
CONVERS
ION
FACTOR
ADJUST
FOR NUMER I C AND
ALPHA
RANGE
ADD CONVERS I
ON
AND
ADJUST
LOW
NIBBLE
ADJUST
HIGH
NIBBLE
TO ASCH I RANGE
;
01
SABLE
KB
; 0 I
SPLA
Y CHARACTER
IN
AL
CALL
VIDEO_IO
CS:CODE,DS:DATA
OS
AL,CS:[SI]
SI
AX
PRT
HEX
AX -
AL,
10
G12A
NEAR
AL,89H
CMD
PORT
,AL
AL,10000101B
PORT
B,AL
AL
,
OMFG
ERR
FLAG
PORT_A,AL
-
; RETURN
TO
CALLER
ENDP
ES:OIO
ROM
INIT,0003H
;
LOAD
OFFSET
ES:
01
O-ROM-SEG,
OS
; LOAD SEGMENT
DWORD
PTR
ES:OIO
ROM
INIT
;
CALL
INIL/TEST
ROUTINE
OX
- -
PROC
MOV
INC
PUSH
CALL
POP
CMP
JNE
RET
ENDP
ASSUME
G12:
P
MSG
GI2A:
POP
RET
E_MSG ENDP
.--------------------------- -----------------------------
E_MSG PROC NEAR
MOV
BP,SI
CALL
P
MSG
PUSH OS
CALL
DDS
MOV
AL
,
BYTE
PTR
OEQU I P
FLAG
LOOP /
HAL
T
ON
ERROR
AND
AL,OIH
-
SWITCH
ON?
JNZ
G12
NO
- RETURN
MFG
HALT:
-
CLI
MOV
OUT
MOV
OUT
MOV
OUT
HLT
; ---------------------------
---
--------------
---
-----------------
--
--
--
--
TH
I S PROCEDURE
WILL
I SSUE LONG TONES (1
-3/4
SECONDS) AND ONE
OR
;
MORE
SHORT TONES
(9/32
SECOND} TO
INDICATE
A
FAILURE
ON
THE
PLANAR
BOARD,
A
BAD
MEMORY
MODULE,
OR
A PROBLEM
WITH
THE
CRT.
ENTRY
PARAMETERS:
DH
= NUMBER OF LONG TONES TO
BEEP.
DL
= NUMBER OF SHORT TONES TO
BEEP.
;
ENTRY
REQU I
REMENTS:
; S I =
OFFSET
(ADDRESS)
OF MESSAGE
BUFFER
;
CX
= MESSAGE
BYTE
COUNT
;
MAX I
MUM
MESSAGE
LENGTH
IS
36
CHARACTERS
XL
AT
_PR
PROC
NEAR
ADD
AL,090H
DAA
ADC
AL,040H
DAA
PRT
_HEX
PROC NEAR
MOV
AH,14
MOV
BH,O
INT
10H
RET
PRT
HEX ENDP
XLAT
PR ENDP
XPC_BYTE
ENDP
F4
LABEL
WORD
OW
3BCH
OW
318H
OW
218H
F4E
LABEL
WORD
.
--
----------------------------------------------
XPC
BYTE
PROC NEAR
- PUSH AX
MOV
CL,4
SHR
AL,CL
CALL
XLAT
PR
POP
AX-
AND
AL,OFH
.
------------------------------------------------
; CONVERT AND PR I
NT
ASC I I CODE :
AL
MUST CONTA I N NUMBER TO
BE
CONVERTED.
:
AX AND
BX
DESTROYED.
:
MOV
MOV
CALL
POP
ROM
CHECK
END:
-
RET
ROM_CHECK
1991
1991
1991
2E:
8A
04
199A
46
199B
50
199C
E8
1969
R
199F
58
19AO
3C
OA
19A2
15
F3
19A4
C3
19A5
1916
1916
8B
EE
1918
E8
1991
R
191B
IE
191C
E8
lA12
R
191F
AO
0010
R
1982
24
01
1984
15
OF
1986
1986
FA
1981
BO
89
1989
E6
63
198B
BO
85
1980
E6
61
198F
AO
0015
R
1992
E6
60
1994
F4
1995
1995
IF
1996
C3
1991
1910
1910
03BC
1912
0318
1914
0218
1916
1963
1963
04
90
1965
21
1966
14
40
1968
21
1969
1969
B4
OE
196B
B1
00
1960
CD
10
196F
C3
1910
1910
1910
1958
1958
50
1959
Bl
04
195B
02
E8
1950
E8
1963
R
1960
58
1961
24
OF
1945
26:
C1
06
0061
R
0003
194C
26:
8C
1E
0069
R
1951
26:
FF
IE
0061
R
1956
5A
1951
1951
C3
1958
2041
2048
2049
2050
2051
2052
2053
2054
2055
2056
2051
2058
2059
2060
2061
2062
2063
2064
2065
2066
2061
2068
2069
2010
2011
2012
2013
2014
2015
2016
2011
2018
2019
2080
2081
2082
2083
2084
2085
2086
2081
2088
2089
2090
2091
2092
2093
2094
2095
2096
2091
2098
2099
2100
2101
2102
2103
2104
2105
2106
2101
2108
2109
2110
2111
2112
2113
2114
2115
2116
2111
2118
2119
2120
2121
2122
2123
2124
2125
2126
2121
2128
2129
2130
2131
2132
2133
2134
2135
2136
2131
2138
2139
2140
2141
2142
2143
2144
2145
2146
2141
2148
2149
2150
2151
2152
2153
2154
2155
2156
2151
2158
2159
2160
5-102
POST
(01/10/86)
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