IBM PC CONVERTIBLE Technical Reference page 140

09E6
09E8
09EB
09ED
09EE
09EF
09F5
09F7
09F9
09FB
09FE
OAOI
OA03
OA03
OA06
OA09
OAOB
B4 20
E8 0000
8A 08
OE
07
81 3E 0063
75 14
A8 01
74 08
BF 0000 E
80 E3 7E
EB lA
BF 0000 E
80 E3 FB
EB 12
OAOB A8 02
OAOD 74 08
OAOF BF 0000 E
OAl2 80 E3 70
OAl5 EB 06
OAl7
OAl7 BF 0000 E
OAIA 80 E3 F7
OAID
OAlD
84 DB
OAIF
74 2E
OA21 F6 C3 03
OA24 74 06
OA26 2E: Al 0000
OA2A EB 25
OA2C
OA2C B4 22
OA2E E8 0000 E
OA31 F6 C3 04
OA34 74 OA
OA36 A8 02
OA38 75 15
OA3A
2E: Al 0000
OA3E
EB 11
OA40
0A40 F6 C3 08
OA43 74 OA
0A45 A8 04
0A47 75 06
0A49 2E: Al 0000
OA4D EB 02
OA4F
OA4F 2B CO
OA51
OA51 55
OA52 8B EC
OA54 8C 46 10
OA57 89 7E 04
OA5A 5D
FIGURED OUT WHAT DISPLAY IS CURRENTLY ACTIVE
MOV AH, RTCDSP _CON
CAll GELRTCREG
MOV Bl,Al
PUSH CS
POP ES
R 0304
CMP ADD1L6845, 03D4H
JNE PHYS_MONO
GET DISPLAY CONFIGURATION
SAVE DISPLAY CON FIG
ES
=
CS
IS CGA CURRENT MODE?
NO, JUMP TO MONO TEST
COLOR IS CURRENT MODE. SEE IF COLOR DISPLAY OR LCD CONFIG AS COLOR
IS THE CURRENT DISPLAY. SET ES:DI TO POINT TO TBl OF CRNT DSPlY.
ALSO TURN OFF CURRENT DISPLAY BIT IN THE DISPLAY CONFIG BYTE.
TEST Al,DSP_ClCD ; IS LCD CONFIGURED AS CGA?
JZ
PHYS_CGAI
; NO, JUMP TO COLOR DISPLAY
MOV
DI,OFFSET lCD_CGILTBl ; SET ADDR TO LCD AS CGA TBl
AND
Bl,NOT DSP_ClCD+DSP_lCD_PRES ; TURN OFF LCD BITS
JMP SHORT
PHY~-.Al
T
YES, JUMP TO TEST AlT DSPlY
PHYS_CGAl: CURRENT DSPlY IS COLOR DSPlY
MOV DI,OFFSET CGILTBl SET ADDRESS TO CGA TABLE
AND Bl, NOT DSP _CGA TURN OFF CURRENT DISPLAY BIT
JMP SHORT PHYS-.Al T YES, JUMP TO TEST ALT DSPl Y
MONO IS CURRENT MODE. SEE IF MONOCHROME DSPlY OR LCD CONFIG AS MONO
IS CURRENT DISPLAY. SET ES:DI TO POINT TO TABLE OF CURRENT DISPLAY.
ALSO TURN OFF CURRENT DISPLAY BIT IN THE DISPLAY CONFIG BYTE.
PHYS.Jo10NO:
TEST Al,DSP.Jo1lCD ; IS LCD CONFIGURED AS MONO?
JZ PHYS.Jo10NOl ; NO, JUMP TO COLOR DISPLAY
MOV DI,OFFSET lCD.Jo10NO_TBl ; DEFAULT TO LCD MONO TABLE
AND Bl,NOT DSP_MlCD+DSP_lCD_PRES ; TURN OFF LCD BITS
JMP SHORT PHYS-.Al T YES, JUMP TO TEST ALT DSPlY
PHYS_MONOl: ; CURRENT DSPl Y MONO MONITOR
MOV DI,OFFSET MONO_TBl ; NO, CURRENT DSPlY MONO MNTR
AND Bl,NOT DSP.Jo10NO ; TURN OFF CURRENT DISPLAY BIT
TEST FOR THE ALTERNATE DISPLAY AND SET AX TO THE MONITOR NUMBER OF
Al TERNATE DISPLAY. Bl SHOULD CONTAIN THE ALTERNATE DISPLAY CONFIG.
IF THERE IS NO ALTERNATE DISPLAY OR THE ALTERNATE IS INOPERATIVE
THE MONITOR NUMBER IS O.
PHYS-.Al T: ; TEST FOR ALTERNATE DISPLAY
TEST
Bl, Bl ; ANY ALTERNATE DSPS PRESENT?
JZ PHYS-.Al LNONE ; NO, JUMP TO SET MNTR
#
TO 0
TEST Bl,DSP_ClCD+DSP.Jo1lCD ; IS AlT MONITOR THE LCD
JZ PHYS-.Al Tl NO, JUMP TO CHECK OTHER DSPlY
MOV
AX ,lCDJGILTBl [OJ YES, SET LCD MONITOR
#
JMP SHORT PHYS_END JUMP TO EXIT
PHYS-.Al Tl: TEST FOR THE COLOR DISPLAY
MOV AH, RTCDSP _STAT GET THE DISPLAY STATUS
CAll GELRTCREG
TEST Bl ,DSP _CGA IS ALT DSP COLOR MONITOR?
JZ PHYS-.Al T2 JUMP TO TEST MONO MON ITOR
TEST Al, CGA_BAD IS THE CGA BAD?
JNZ PHYS-.Al LNONE YES, SET FOR NO ALTERNATE
MOV AX , CGA_TBl [0] NO, SET CGA MONITOR #
JMP
SHORT PHYS_END
JUMP TO EXIT
PHYS-.Al T2: TEST FOR MONOCHROME MON ITOR
TEST
Bl, DSP _MONO IS AlT DSPAY MONO MONITOR?
JZ
PHYS-.Al T _NONE JUMP NO Al T DISPLAY
TEST Al, MONO_BAD IS THE MONOCHROME BAD?
JNZ PHYS-.Al T _NONE YES, SET FOR NO ALTERNATE
MOV AX ,MONO_TBl [0] NO, SET MONOCHROME MONITOR
#
JMP
SHORT PHYS_END
JUMP TO EXIT
PHYS-.Al T _NONE: Al T NOT THERE OR INOPERATIVE
SUB AX,AX
SET MON ITOR # TO 0
PHYS_END:
PUSH BP
MOV BP ,SP GET PTR TO STACK SAVE AREA
MOV [BP] • ES_POS, ES SET UP RETURN VAL IN STACK
MOV [BP] .DLPOS,DI
POP BP
ROM BIOS 2-115