IBM 5170 Technical Reference page 200

; ------- CLEAR lOCH CHK OR R/W PAR CHK
048F 2B F6
SUB SI,SI WRITE TO fAILING BLOCK
0491 AB STOSW
0492 E4 61 IN AL, PORT B
0494
OC OC
OR
AL,RAM PAR OFf TOGGLE 10/PAR CHECK ENABLE
0496
EB
00
JMP
SHORT S+2 -
10 OELAY
0498
E6 61
OUT PORT_B,AL
049A 24 F3
ANO
AL, RAM PAR ON
049C EB 00
JMP
SHORT S+2 - 10 OELAY
049E E6 61
OUT PORT_B, AL
--=============
;-------'SET MEMORY SIZE
=========-==-==
OIJAO B8 0018 MOV AX, RSDA PTR SET THE DATA SEGMENT
04A3 8E D8 MOV DS,AX- I N PROTECTED MODE
;------- GET THE DIAG_STATUS fROM CMOS
04A5 BO 8E
MOV
AL,DIAG STATUS
04A7
E6 70
OUT
CMOS_PORT, AL
04A9 EB 00 JMP SHORT $+2 10 DELAY
04AB E4 71
IN AL,CMOS_PORT+1
04AD 8A D8
MOV
BL,AL SAVE THE STATUS BYTE
04AF BO B3
MOV AL, I NfO STATUS
04B1 E6 70
OUT CMOS_PORT, AL
04B3 EB 00
JMP
SHORT $+2 10 DELAY
04B5 E4 71 IN AL,CMOS PORT+l
04B7
8A
F8
MOV
BH,AL -
SAVE THE STATUS BYTE
; ------- GET THE LAST OF GOOD MEMORY
04B9 59
POP
ex
04BA 58
POP AX
GET THE LAST Of GOOD MEMORY
04BB 8B C8
MOV CX,AX
SAVE IT
; ------- BELOW 512K?
04BD 3D 0200
eMP AX,512
LAST GOOD MEMORY BELOW 512K?
04CO
72
39
JB M3
GO I f YES
; ------- BELOW 640K?
04C2 3D 0280
eMP
AX,640 LAST GOOD MENORY BELOW 640K?
04C5 72 11
JB
M1 GO I F YES
; ------- 640K UP ERROR
04C7 F6 C7 80 TEST BH, M640K [S BASE RAM
640K
04CA 75 06 JNZ
MO
04CC 2D 0200
SUB
AX,512 512K BASE RAM
OIICF EB OF 90
JMP
M2
04D2 2D 0280
MO;
SUB
AX, 640
640K
BASE RAN
04D5 EB 09 90 JMP M2
;------- 512K TO 640K ERROR
04D8 F6 C7 80 Ml: TEST BH,M640K I S BASE RAM 640K?
04DB 75 lE JNZ M3 GO I F YES
D4DD 2D 0200 SUB AX,512
STR I P BASE RAM FROM 10 RAM
;------- WRITE SIZE TO CMOS
04EO
8B C8 M2:
MOV CX,AX
SAVE ADJUSTED MEMORY SIZE
04E2 BO B1 ~IOV AL,M SIZE HI
D4E4 E6 70 OUT CMOS::::PORT-;-AL
04E6
8A C')
MOV AL,CH
GET THE HIGH BYTE MEMORY SIZE
04E8 EB 00
JMP
SHORT $+2 10 DELAY
04EA E6 71
OUT
CMOS PORT+l, AL WRITE IT
04EC BO BO
MOV
AL,M-SIZE LO DO THE LOW BYTE
04EE EB 00 JMP
SHORT $+2­
04FD E6 70 OUT CMOS PORT, AL
01lF2 8A Cl MOV AL,CL GET TI-lE LOW BYTE
04F4
EB DO JMP SHORT $+2
10 DELAY
04F6 E6 71 OUT CMOS PORT+l, AL WRITE IT
04F8 EB 04 90 JMP
M4 -
CONTI NUE
;------- SET BASE MEMORY SIZE
04FB
A3 0013 R M3:
MOV MEMORY_SIZE,AX
TO I ND I CATE HOW MUCH MEM WORK I NG
; ------- SET SHUTDOWN 3
04FE
BO 8F M4:
MOV AL,SHUT_DOWN
AD DR FOR SHUTDOWN RETURN
0500
E6 70
OUT
CMOS PORT, AL
0')02 BO 03
MOV
AL,3- SET RETURN 3
0504 EB 00 JMP SHORT $+2
10 DELAY
0506
E6 71
OUT
CMOS_PORT+1, AL
; ------- SHUTDOWN
0508 E9 0000 E JMP PROC_SHUTDOWN
PAGE
; ------- ENTRY 3 FROM PROCESSOR SHUTDOWN
MEMORY ERROR REPORT I NG
DESCR I PT I ON FOR ERRORS 201 (CMP ERROR 0 r PAR I TY)
or 202(ADDRESS LINE 0-15 ERROR)
R/W MEMORY ERRORS WI LL BE REPORTED AS fOLLOWS
AABBCC DDEE 201(or 202)
AA=HIGH BYTE OF 24 BIT ADDRESS
BB=MIDDLE BYTE Of 24 BIT ADDRESS
CC=LOW BYTE OF 24 BIT ADDRESS
DD=HIGH BYTE OF XOR FAILING BIT PATTERN
EE=LOW BYTE OF XOR FAILING BIT PATTERN
DESCRIPTION FOR ERROR 202 (ADDRESS LINE 00-15)
A WORD OF FFFF IS WRITTEN AT THE FIRST WORD AND LAST WORD
OF EACH 64K BLOCK WITH ZEROS AT ALL OTHER LOCATIONS OF THE
BLOCK. A SCAN Of THE BLOCK I S MADE TO I NSURE ADDRESS LI NE
0-15 ARE FUNCTIONING.
DESCRIPTION FOR ERROR 203 (ADDRESS LINE 16-23)
AT THE LAST PASS OF TilE STORAGE TEST, FOR EACH BLOCK OF
64K, THE CURHENT STORAGE SIZE (ID) IS WRITTEN AT THE FIRST
WORD OF EACH BLOCK. I TIS USED TO DETERM I NE ADDRESS I NG
FA I LURES.
AABBCC DDEE 203
SAME AS ABOVE EXCEPT FOR DDEE
5-58 Test 2