IBM PC CONVERTIBLE

0178
0178 50
0179 53
017A 52
017B 9C
017C 8A 08
017E FA
017F B4 20
0181 E8 0000 E
0184 80 FB 07
0187 74 OE
0189 3C 82
018B 75 28
0180 BO 81
018F BA 03B8
0192 B3 01
0194 EB OC 90
0197
0197
3C 81
0199 75 1A
019B BO 82
0190 BA 0308
01AO 2A DB
01A2
01A2 E8 0000
01A5 8A C3
01A7 EE
01A8 E8 0000 E
01AB BO 00
01AD E6 74
OlAF E4 75
01B1 OC 40
01B3 E6 75
01B5
01B5
90
01B6 5A
0187 58
01B8 58
LCD-MOVE
INPUT
THIS ROUTINE CHECKS FOR MONOCHROME TO CGA OR VICE
VERSA CHANGE REQUESTED FOR THE LCD DISPLAY. IF LCD
IS THE ONLY DISPLAY, A CHANGE IS ALLOWED AND A CALL TO
LCD_INIT IS MADE TO SET THE CONTROL REGISTERS BEFORE
CONTINUING WITH THE MODE SET.
AL HAS MODE SET VALUE
OUTPUT
IF LCD IS NOT THE ONLY DISPLAY THEN A RETURN IS MADE
WITH NO CHANGES. IF THE LCD IS THE ONLY DISPLAY AND A
CGA TO MONO OR MONO TO CGA CHANGE IS REQUESTED, THE
DISPLAY CONFIG BYTE (RTCDSP_CON) IS UPDATED TO REFLECT
THE CHANGE. AND, A CALL TO LCD_INIT IS MADE TO UPDATE
THE LCD CONTROL REGISTERS FOR THE NEW LCD MODE.
A RETURN IS THEN MADE TO FINISH THE SET MODE. IF NO
MONO TO CGA OR CGA TO MONO CHANGE IS REQUESTED - NO
ACTION IS TAKEN.
REGISTERS MODIFIED: SI
INTERRUPTS: DISABLED DURING PROCESSING
LCD_MOVE
PROC NEAR
PUSH AX
PUSH BX
PUSH OX
PUSHF
SAVE FLAGS
MOV
BL,AL SAVE NEW MODE REQUEST
CLI DISABLE INTERRUPTS
MOV AH, RTCDSP _CON GET DISPLAY CONFIGURATION
CALL GELRTCREG
DATA RETURNED IN AL
CMP BL,7 MONOCHROME MODE REQUESTED?
JE
LCD_MOl
CGA MODE
BEING REQUESTED
CMP AL,DSP_MLCD+DSP_LCD_PRES; IS LCD PRES & CONFIGURED
; MONO & NO OTHER ADA PRESENT
JNE
LCD_M03
; JUMP I F CAN'T EFFECT CHANGE
MOV
AL,DSP_CLCD+DSP_LCD_PRES; SET LCD TO CGA MODE
MOV
OX, MONO_CNTL
GET MONO CONTROL ADDRESS
MOV
BL ,01 ; DISABLE VIDEO FOR MONOCHROME
JMP LCD_M02
; GO CHANGE CONFIGURATION
MONOCHROME MODE
IS BEING REQUESTED
LCD_MOl:
CMP AL,DSP_CLCD+DSP_LCD_PRES; IS LCD PRES & CONFIGURED
; CGA & NO OTHER ADA PRESENT
JNE
LCD_M03
; NO THEN EXIT
MOV AL,DSP-MLCD+DSP_LCD_PRES; SET CONFIG LCD MONO MODE
MOV
OX, CGA_CNTL
; MODE CTRL FOR PRESENT STATE
SUB BL, BL ; DISABLE VIDEO FOR CGA
LCD ADAPTER CHANGE CAN BE MADE
LCD-M02 :
CALL PULRTCREG UPDATE DISPLAY CONFIGURATION
MOV AL, BL DISABLE VIDEO IN CRNT STATE
OUT DX,AL
CALL LCDINIT SET UP LCD
MOV
AL, LCD_FUNCT AL = 0
OUT
LCD_I NDX, AL
PORT 74
IN
AL,LCD_DATA
GET LCDC REGS
OR AL, PANEL_ENABLE
TURN ON PANEL POWER
OUT
LCD_DATA,AL
LCD-M03 :
POPF
RESTORE INTERRUPT FLAGS
POP
OX RESTORE REGISTERS
POP 8X
POP AX
ROM BIOS 2-87