IBM 5150 - Page 132

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LOC OBJ
LINE
SOURCE
E240 08:
E240 F6C4FF
•• 7 TEST AH,OFFH ; DID TIMER 0 INTERRUPT OCCUR?
E250 7504
D.
; YES • CHECK TIMER OP FOR SLOW TIME
•••
J"Z
E252 E2F9 LOOP I WAIT FOR UITR FOR SPECIFIED TIME
D'
E254 EBEI
.70
JMP
D.
I TIMER 0 INTR DION' T OCCUR - ERR
E256 .71 D9:
E256 B112
.7'
ItDV
CL,16 I SET PGM lOOP tNT
E258 BOFF .73
MDV
Al,OFFH I WRITE TIMER 0 CNT REG
~
E2SA £640 .74
OUT
TlHERO,AL
Else 88FEOO
.7.
HOY AX.OFEH
EZSF EE .7.
OUT
DX,AL
E260
.77 010:
E260 F6C4FF
.7.
TEST
AH,OFFH I DID TIHfR 0 INTERRUPT ocelll(?
E263 7502
.7.
J"Z
D.
; YES - TIMER CHTING TOO FAST, ERR
E265 E2F9
•• 0
lOOP DIO
; WAIT FOR INTR FOR SPECIFIED TIME
."
.. ,
j----- ESTABLISH BIOS SUBROUTINE CAll INTERRUPT VECTORS
.83
E267 IE .84
PUSH DS J SAYE POINTER TO DATA AREA
£266 8F4000
.8'
I1DV DI,OFFSET VIDEO_INT I SETUP ADDA TO INTR AREA
E268 DE
PUSH CS
E26C 1F •• 7
pop
DS J SETUP ADOR OF VECTOR TABLE
E26D 8E03FF90
I1DV SI,OFFSET VECTOR_TABLE+16
I
START WITH VIDEO ElmIY
E271 MIDOO .8.
HOY
CX.16
.
...
.,
;----- SETUP TIMER 0 TO MODE 3
...
E274 BOFF
MOV AL,OFFH
I DISABLE ALL DEVICE INTERRUPTS
...
E276
EE •• 4
OUT DX,AL
E277 6036
•• s
MOV
AL,36H ; SEL TUI O.LSB.MSB,MDDE 3
E279 E643
OUT TIMER+3.AL
I WRITE TIMER MODE REG
E27B BODO •• 7
MDV
AL,O
E27D E640
OUT TIMER ,AL I WRITE LSB TO TIMER 0 REG
E27F E1A:
E27F
AS 700
I1DVSW
I HOVE VECTOR TABLE TO RAM
E280 47 701
INC
DI I I10VE PAST SEGMENT POINTER
E281
47
702
INC DI
E282 E2F6 703
LOOP EIA
~
E284 E640
704 OUT TIMER,Al
I WRITE "58 TO TIMER 0 REG
E286 IF
70S POP
DS
j RECOVER DATA SEG POINTER
70.
707 ;----- SETUP TIMER 0 TO BLINK LEO IF MANUFACTURING TEST MODE
70.
E287 E8B903 709
CALL KBD_RESET I SEND SOFTWARE RESET TO KEYBRD
ElSA 80FBAA 710
eMP
BL,OAAH
I
SCAN CODE
'AA' RETURNED?
E28D 741E 711
JE E.
I YES - CONTINUE (NON MFS MODE)
E28F BOlC 712
HOV AL,3CH I EN, 1<80. SET KBD C LK LINE LOW
£291 E661
7"
OUT
POIH_B,AL I WRITE 8255 PORT B
E293 90
714 HOP
E294 90
715
HOP
E295 E460
71. IH
AL.PORT_A I WAS A BIT CLOCI<ED IN?
E297 24FF
717 AND AL,OFFH
E299 750E
718
J"Z
E2
I YES - CONTINUE (NOH MFG I1OOE)
E298 FE061204 719
INC DATA_AREAl OFFSET HFG_TST J ; ELSE SET SW FOR MFG TEST !'lODE
E29F C10620006D£6
720 HOV
INT_ADDR,OFFSET BLI*-INT J SETUP TIMER INTR TO BLINK LED
f2A5 BOFE 721
MDV AL,OFEH ; ENABLE TIMER INTERRUPT
EU7 E621 722
OUT INTAOl,AL
E2A9 723 E2:
1 JI.kIPER_NOT _IN:
E2U BOce
7'4 MDV
AL,OCCH ; RESET THE KEYBOARD
ElAB E661 725
OUT
PORT_B,AL
7'.
7'7
;--------------------------------------------------------
7'8
INITIALIZE ANO START CRT CONTROLLER (6845)
729 TEST VIDEO READ/WRITE STORAGE.
730 ; DESCRIPTION
731
RESET THE VIDEO ENABLE SIGNAL.
73'
SElECT ALPHANUMERIC MOOE, 40 'If ZS, B & W.
733 READ/WRITE DATA PATTERNS TO STG. CHECK STG
~
734 ADDRESSABlLITY.
73'
1------- ---- - ----- - - -------- ----------- ------- - - - - --- - - --
E'AD
73.
E6:
ElAD E460 737
IN
AL,PORT_A 1 READ SENSE SWITCHES
EUF 8400 738
I1DV
AH.D
E2Bl A31004
73.
HOV
DATA_WOROIOFFSET EQUIP ]LAGJ ,AX I STORE SENSE SW INFO
E264
740 E6A:
E2B4
2430
741 AND AL,30H
I ISOLATE VIDEO SWS
E266 7529
74'
J"Z
E7
I VIDEO SWS SET TO 01
System BIOS 5-39