IBM PC CONVERTIBLE User Manual

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IE
PUSH OS
MUST USE 40:0 FOR DATA AREA
50
PUSH AX
53
PUSH BX
51
PUSH CX
FOR CURSOR LIMITS
52
PUSH OX
CURRENT CURSOR POSITION
B8 ----
MOV
AX,XXDATA HEX 50
8E CO
MOV ES,AX
26: 80 3E 0000 R 01 CMP
STATUS_BYTE,PRTSLJlCTIVE; PRINT IN PROGRESS?
JFZ
EXIT
;
YES, JUMP TO END
75 03 JNZ
$+5
; I F NOT ZERO JUMP AROUND JUMP
E9 OB07 R
JMP EXIT
;
ELSE TAKE A LONG JUMP
26: C6 06 0000 R 01 MOV
STATUS_BYTE,PRTSLJlCTIVE; SHOW PRNT IN PROGRESS
B8 ---- R
MOV AX,DATA
HEX 40
8E 08 MOV DS,AX
83 3E 0008 R 00 CMP PRI NTER_BASE [OJ, 0
IS PRINTER ATTACHED?
JFZ ERR20
NO, ERROR EX IT
75 03
JNZ
$+5
I F NOT ZERO JUMP AROUND JUMP
EB 6F 90 JMP ERR20
ELSE TAKE A LONG JUMP
B4 OF MOV
AH ,GELVIDEO_STATE REQUEST CURRENT SCREEN MODE
CD 10
INT
VIDEO_FN ON RETURN
[ALJ = MODE,
[AHJ=NUMBER COLUMNS/LINE,
; ------------- -- - - - - - - -- - - - - - -- - - - - - ---- - - - - - - - - - - - -- - - - - --- - -- --
8A CC
B5 19
E8 OBOE R
F6 C4 29
75 5E
51
B4 03
CD 10
59
52
33
02
F6 06 0071 R 80
74 07
80 26 0071 R 7F
EB 35
B4 02
CD 10
B4 08
CD 10
OA CO
75 02
BO 20
52
33 02
32 E4
CD 17
5A
F6 C4 29
75 27
FE C2
3A CA
75 01
32 02
8A E2
52
E8 OBOE R
AT THIS POINT WE KNOW THE COLUMNS/LINE ARE IN
[AXJ AND THE PAGE IF APPLICABLE IS IN -BH-. THE STACK
HAS DS,AX,BX,CX,DX PUSHED. -AL- HAS VIDEO MODE
MOV
MOV
CALL
TEST
JNZ
PUSH
MOV
INT
POP
PUSH
XOR
CL,AH
CH,25
CRLF
AH,29H
ERR20
CX
AH,GELCURSOR_INFO
VIDEO_FN
CX
OX
DX,DX
USE OF -CX- REGISTER TO
CONTROL ROW & COLUMNS
CR LF ROUTINE
TEST FOR PRINTER ERRORS
OUT OF PAPER, I/O & TIME OUT
JUMP I F ERROR DETECTED
SAVE SCREEN BOUNDS
WILL NOW READ THE CURSOR.
ON RETURN: CX=CRNT CRSR MODE,
OX = ROW, COL OF CRNT CURSOR
RECALL SCREEN BOUNDS
SAVE CURRENT CURSOR POSITION
WILL SET CURSOR POS TO -0,0-
THE LOOP FROM PRII0 TO THE INSTRUCTION PRIOR TO PRI20
IS THE LOOP TO READ EACH CURSOR POSITION FROM THE
SCREEN AND PRINT.
PRIlO:
TEST
BIOS_BREAK, BREAK-HIT ; HAS BREAK KEY BEEN PRESSED?
JZ
PRIl2
; NO KEY, JUMP AROUND
AND
BIOS_BREAK,NOT BREAK-HIT; YES, TURN 8REAK KEY OFF
JMP SHORT PRI20
; JUMP TO END
PRI 12:
MOV
AH, SELCURSOR_POS TO SHOW CURSOR SET REQUEST
INT VIDEOJN
NEW CURSOR POSITION
MOV AH, READ--.ATLCHAR
TO INDICATE READ CHARACTER
INT
VIDEO_FN CHARACTER NOW IN [ALJ
OR AL,AL
SEE IF VALID CHAR
JNZ
PRIl5
JUMP IF VALID CHAR
MOV
AL,' ,
MAKE A BLANK
PRIl5 :
PUSH OX SAVE CURSOR POSITION
XOR DX,DX
INDICATE PRINTER 1
XOR AH,AH
TO SHOW PRINT CHAR IN -AL-
INT PRINTERJN
PRINT THE CHARACTER
POP OX
RECALL CURSOR POSITION
TEST AH, 29H
TEST FOR PRINTER ERRORS
OUT OT PAPER, I/O & TIME OUT
JNZ ERRI0
JUMP I F ERROR DETECTED
INC DL
ADVANCE TO NEXT COLUMN
CMP CL,DL
SEE IF AT END OF LINE
JNE PRII0
I F NOT PROCEED
XOR DL,DL
BACK TO COLUMN 0
MOV AH,DL [AHJ =0
PUSH OX
SAVE NEW CURSOR POSITION
CALL CRLF
LINE FEED CARRIAGE RETURN
ROM BIOS 2-117

IBM PC CONVERTIBLE Specifications

General

Brand	IBM
Model	PC CONVERTIBLE
Category	Laptop
Language	English