IBM 5150 Technical Reference page 133

LOC OBJ
LINE
SOURCE
ElBa C706400053FF 743
"OV
VIDEO_1NT ,OFFSET Dut1I1Y_RETURN
ElBE E9.6.200
744
J"P
E 18_1 ; SKIP VIDEO TESTS FOR BURN-IN
74S
E2C3
746
ORO
OE2C3H
E2C3
747
tI1I_INT
~OC
NEAR
E2C3 50
748
PUSH AX
; SAVE
ORIG
CONTEHTS
OF
AX
E2C4 E462
7'9 IN Al,PORT_C
E2(6 A8CO
750
TEST AL.OCOH ; PARITY CHECK?
f2ea 7415
751
JZ 014
I NO. EXIT FROM ROUTINE
f2eA BEDAFF90
752
MOV SI.OFFSET 01 ; ADDR OF ERROR MSG
E2CE .6.840
753
TEST AL.40H I 110 PARITY CHECK
f2DO 7504
7S.
JNZ 013
j
DISPLAY ERROR MSG
E202 BE23FF90
755
MOV SI.OFFSET 02 ; MUST BE PLANAR
E2D6 756
013:
f206 2BCO 757
SUB AX,AX I INIT AND SET MODE FOR VIDEO
f208 COlO
758
INT IOH
; CALL VIDEO.IO PROCEDURE
f20A E8DD03
759
CALL P_MSG ; PRINT ERROR MSG
f200 FA
760 ClI
fZOE F4
761 HlT
; HALT SYSTEM
E2DF
76'
E20F 58
763
pop
AX
I RESTORE ORIG CONTENTS OF AX
E2EO CF
76'
IRET
765
NMI_INT ENOP
ElEi
766
£1:
I TEST_VIDEO:
E2El 3e30
767
C"P AL.30H ; B/W CARD ATTACHED?
E2E3 7408 768
JE
E8 ; YES - SET MODE FDR BIN CARD
E2E5 FEC4
769 INC
AH
i
SET COLOR HOOE FOR COLOR CD
E2f7 3e20
770
C"P
AL.20H
; 80X25 MODE SE LECTED?
E2E9 '7502
771
JHE E8
; NO - SET MODE FOR 40X25
f2EB 8403
77'
MOV
AH.3
; SET MODE FOR 80X25
fHO
773 E8:
fZED 66EO
774 XCHG AH ,AL
; SET.MODE
E2EF 50 775
PUSH AX
; SAVE VIDEO MODE ON STACK
E2FO 2.6.E4
776
SUB AH,AH
; INITIALIZE TO ALPHANUMERIC I1D
E2F2 COlO 777
INT 10H
I CALL VIDEO.lO
E2F4 58
778
POP AX
I RESTORE VIDEO SENSE SWS IN AH
E2F5 50
779
PUSH AX
I RESAVE VALUE
E2F6 8e0080 780
MOV BX,OBOOOH
I BEG VIDEO RAM ADOR BIW CO
E2F9 8AB803 781
MOV DX,3B8H ; HODE REG FOR BIW
E2FC B90010 782
MOV CX,4096 I RAM BYTE CNT FOR BIW CO
E2FF BOOI 783
HOV AL,I ; SET MODE FOR Bioi CARD
nOl 80FC30 784
CMP AH,30H
I BIW VIDEO CARD ATTACHED?
E304 7408
785 JE E9 J YES - GO TEST VIDEO STG
n06 B7B8 786
HOV BH,OB8H
i
BEG VIDEO RAM ADDR COLOR CD
E30a 8208
787 MOV DL,OD8H ; MODE REG FOR COLOR CD
f30A 8540
788 MOY CH,40H
1 RAM BYTE CNT FOR COLOR CD
DOC FEte
789
DEC AL
i
SET MODE, TO 0 FOR COLOR CD
nOE
79. E9:
; TEST_VIDEO_STGL
DOE EE 791 OOT DX,AL ; DISABLE VIDEO FOR COLOR CD
E30F BIFD3412
'"
C"P
ep,1234H
POD INITIATED BY KBD RESET?
n13 8EC3
793 I10V ES,ex POINT ES TO VIDEO RAM STG
DIS 7407 794
JE EIO YES - SKIP YIDEO RAM TEST
nl7 8EOB
795
MOV
Ds.ex I POINT os TO VIDEO RAM 5TG
796
ASSUME OS:NOTHING,ES:NOTHING
E319 E8FFFC 797
CALL 5TGTST.CNT I 60 n:ST VIDEO RIW STG
Dit 7532 798 JNE E17
; RIN STG FAILURE - BEEP SPI(
799 1---------------------------------------------------------------­
800 1 SETUP VIDEO DATA ON SCREEN FOR VIDEO LINE TEST.
801 ; DESCRIPTION
802 ENABLE YIDEO SIGNAL AND SET HODE.
803 DISPLAY A HORIZONTAL BAR ON SCREEN.
804 1------­ - -------------------­ -----------­ - -------­ - -------------­
DIE
805
EIO:
E31E 58
806
POP AX ; GET VIDEO SENSE SWS I AH J
E31F 50
807 PUSH AX ; SAVE IT
E320 B400 808
MOV "H,D i
ENABLE VIOEO AND SET MODE
E322 COlO
e09
INT iOH ; VIDEO
E324 B82070
elo
MOV AX. 7020H I WRT BLANKS IN REVERSE VIDEO
E327 2BFF
811
SUB 01.01 i SETUP STARTING LaC
E329 892600 812 MOV CK.40 ; NO. OF BLANKS TO DISPLAY
E32C F3
813
REP STOSW
I WRITE VIDEO STORAGE
E32D AB
814 1---------- -------­ -------------------------------------­
815 CRT INTERFACE LINES TEST
816
i
DESCRIPTION
817 SENSE ONIOFF TRANSITION OF THE VIDEO ENABLE
5-40 System BIOS