IBM PC CONVERTIBLE User Manual

0702
A8 04
TEST
AL,DSP_CGA
; CGA DISPLAY ONLY?
0704
75 06 JNZ
SUS_OOI
; IF YES LEAVE LCD AS MONO
MONO DISPLAY OR LCD AS CGA SO SET CGA ACCESS
0706 SUS_OOO:
0706 BA 0304 MOV DX, CGA_CNTL-4
0709 BF B9CO MOV
01 ,SUSPEND_COLOR
01 <-- SAVE AREA SEGMENT
07DC
SUS_OOI :
07DC 39 16 0063 R CMP ADDfL6845, OX IS LCD THE ACTIVE DISPLAY?
07EO
74 25
JE
SUS_003
I F SO THEN OKAY
07E2 8A 2E 0065 MOV
CH,CRLMODLSET CH <--- MODE SET FOR CRT
07E6
B4 22
MOV
AH,RTCDSP_STAT
GET DISPLAY STATUS
07E8
E8 0747 R
CALL
GELRTCNMI
07EB
8B FO
MOV SI,AX SI LOW <--- RTCDSP_STAT
07EO A8 80 TEST
AL, DIAG_FORCE_SUS CHECK RTCDSP _STAT FLAGS
FOR DIAG
RESUME
07EF 74 14
JZ
SUS_002
I F NOT THEN SUSPEND ERROR
SETUP
LCD CONTROLLER FOR ACCESS
07Fl
F6 C7
08 TEST
BH, LCD_ENAB
; CHECK FOR LCD ENABLED
07F4 75 11 JNZ SUS_003 I F SO THEN ALREADY ACCESSED
LCD NOT ACTIVE SO SET ACTIVE FOR ACCESS
07F6 BO 08 MOV
AL, LCD_ENAB
SET ENABLE
07F8
81 FF BICO
CMP 01 ,SUSPEND~ONO CHECK FOR LCD AS MONO
OlFC 74 02 JE
SUS_OOlA
JUMP IF SO
07FE
OC 02
OR
AL,LCD_CGA
OTHERWISE SET LCD AS CGA
0800
SUS_OOlA:
0800 E6 75 OUT
LCD_DATA ,AL
WRITE TO LCD CONTROL
0802 EB 03 90 JMP
SUS_003
SET SUSPEND UNSUCCESSFUL DUE TO LCD
INACCESSABI L ITY
0805
SUS_002:
0805 B3 02 MOV
BL ,LCD_NOLACTIVE
SET FLAG - FOR LCD INOPERABLE, THIS
WILL NOT BECOME AN ERROR
CHECK FOR DISKETTE MOTORS OFF
0807
SUS_003 :
0807 52 PUSH OX ; SAVE LCD ADDRESS
0808 BA 03 F7 MOV
OX, DRIVE_SENSE ; READ DRIVE STATUS
080B
EC
IN AL,DX
080C A8 78 TEST
AL ,DRO_S EL_SENS E +DRLS EL_S ENS E +DRO_MOLS ENS E +DR l~OT _SENS E
080E 74 09 JZ
SUS_004
DISKETTE MOTORS NOT OFF/TURN THEM OFF AND SET ERROR FLAG
0810 BA 03 F2 MOV
DX,DRIVE_CNTL DISKETTE CONTROL
0813 2A CO SUB AL,AL
0815
EE OUT DX,AL
0816 80 CB 01 OR BL,DSKLACTIVE
SET ERROR FLAG
TURN OFF CGA DISPLAY VIDEO
0819
SUS_004:
0819 2A CO SUB AL,AL
081B
BA 0308 MOV
OX, CGA_CNTL DISABLE VIDEO COLOR
081E EE OUT DX,AL
TURN OFF MONO DISPLAY VIDEO
081 F FE CO INC AL
0821 BA 03B8 MOV
DX ,MONO_CNTL DISABLE VIDEO ON MONO
0824 EE OUT DX,AL
0825 5A
POP
OX
RESTORE LCD ADDRESS
SAVE REAL TIME CLOCK INTERRUPT MODE AND TURN OFF ALL BUT ALARM INTERRUPTS
2-52 ROM BIOS

IBM PC CONVERTIBLE Specifications

General

Brand	IBM
Model	PC CONVERTIBLE
Category	Laptop
Language	English