IBM PC CONVERTIBLE

OOBC
OOBC
50
OOBD 32 E4
OOBF 9C
OOCO FA
00C1
00C1
8A C4
00C3
EE
00C4 42
00C5 FE C4
00C7 8A 07
00C9 EE
OOCA 43
OOCB 4A
OOCC E2 F3
OOCE 9D
OOCF
58
OODO IF
00D1 33 FF
00D3 89 3E 004E R
00D7 C6 06 0062 R 00
OODC 59
0000 DO El
OODF 72 21
ODE1 B9 2000
00E4 80 FC 04
00E7 72 14
ODE9 80 FC 07
OOEC 74 04
OOEE 33 CO
OOFO EB OE
00F2
00F2 B4 20
ODF4 E8 0000
00F7 A8 02
00F9 75 02
OOFB B5 08
OOFD
OOFD B8 0720
0100
0100
F3/ AB
o lO2 AO 0049 R
OlO5 32 E4
OlO7 8B FO
0109 8B 16 0063 R
OlOD 83 C2 04
0110 2E: 8A 84 0000
0115
EE
0116 A2 0065 R
BX POINTS TO CORRECT ROW OF
INITIALIZATION TABLE
M9: OULINIT
PUSH AX
SAVE MODE IN AH
XOR AH,AH
AH WILL SERVE AS REGISTER
LOOP THROUGH TABLE,
OUTPUTTTING REG ADDR, THEN VALUE FROM TABLE
PUSHF
CLI
MIa:
MOV AL,AH
OUT DX,AL
INC
OX
INC
AH
MOV AL, [BX]
OUT DX,AL
INC BX
DEC DX
LOOP MIa
POPF
POP AX
POP DS
ASSUME DS:DATA
FILL REGEN AREA WITH BLANKS
XOR
MOV
MOV
POP
SHL
JC
MOV
CMP
JC
CMP
JE
XOR
JMP
Ml1:
MOV
CALL
TEST
JNZ
MOV
M12:
MOV
M13:
REP
DI,DI
CRLSTART, DI
ACTIVE_PAGE,O
CX
CL,l
Ml3A
CX,8192
AH,4
M12
AH,7
M11
AX,AX
SHORT Ml3
AH, RTCDSP _CON
GELRTCREG
AL, DSP ~LCD
M12
CH,08H
AX,' '+7*256
STOSW
SAVE CURRENT FLAGS
INHIBIT INTERRUPTS
INIT LOOP
GET 6845 REGISTER NUMBER
POINT TO DATA PORT
NEXT REGISTER VALUE
GET TABLE VALUE
OUT TO CHIP
NEXT IN TABLE
BACK TO POINTER REGISTER
DO THE WHOLE TABLE
RESTORE FLAGS
GET MODE BACK
REC+VER SEGMENT VALUE
SET UP POINTER FOR REGEN
START ADDR SAVED IN GLOBAL
SET PAGE VALUE
RESTORE CLEAR REGEN BIT
LOOK, DON'T CLR REGEN REQ
I F ON - DON'T CLEAR REGEN
NUMBER OF WORDS IN CGA CARD
TEST FOR GRAPHICS
NO_GRAPH I CS_I NIT
TEST FOR MONO CARD
MONO_CARD_I N IT
FILL FOR GRAPHICS MODE
CLEAR_BUFFER
MONO_CARD_I N IT
GET DISPLAY CONFIGURATION
IS LCD CONFIGURED AS MONO
YES, CLEAR ENTIRE BUFFER
BUFFER
SIZE ON MONO CARD
NO_GRAPH I CS_I NIT
FILL
CHAR FOR ALPHA
CLEAR_BUFFER
FILL REGEN BFR WITH BLANKS
ENABLE VIDEO AND CORRECT PORT SETTING
Ml3A:
XOR
MOV
MOV
ADD
MOV
OUT
MOV
MOV AL, CRLMODE
AH,AH
SI,AX
DX, ADDR_6845
DX,4
AL,CS: [SI+OFFSET M7]
GET THE MODE
INTO AX REGISTER
TBL POINTER, INDEXED BY MODE
PREPARE TO OUTPUT TO
VIDEO ENABLE PORT
DX,AL SET VIDEO ENABLE PORT
CRLMODE_SET ,AL SAVE THAT VALUE
DETERMINE NUMBER OF COLUMNS, BOTH FOR ENTIRE DISPLAY
; ----- AND THE NUMBER TO BE USED FOR TTY INTERFACE
0119 2E: 8A 84 0000
011E 32 E4
0120 A3 004A R
0123 81 E6 OOOE
0127 2E: 8B 8C 0000 E
MOV
XOR
MOV
AL,CS: [SI + OFFSET M6]
AH,AH
CRLCOLS,AX ; NO. OF COLS IN THIS SCREEN
SET CRT LENGTH
AND
MOV
SI,OEH ; WORD OFFSET IN CLR LEN TABLE
CX, CS: lSI + OFFSET M5] ; LENGTH TO CLEAR
ROM BIOS 2-85