IBM PC CONVERTIBLE Technical Reference page 105

(AH) =07H SCROLL ACTIVE PAGE DOWN
(AL) = NUMBER OF LINES, INPUT LINES BLANKED AT TOP
OF WINDOW
AL = 0 MEANS BLANK ENTI RE WI NDOW
(CH,CL) = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL
(DH,DL) = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL
(BH) = ATTRIBUTE TO BE USED ON BLANK LINE
CHARACTER HANDLI NG ROUTI NES
(AH) =08H READ ATTRI BUTE/CHARACTER AT CURRENT CURSOR POSITION
(BH) = DISPLAY PAGE (FOR ALPHA MODES ONLY)
ON EXIT:
(AL) = CHAR READ
(AH) = ATTRIBUTE OF CHAR READ (ALPHA MODES ONLY
(AH)=09H WRITE ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION
(BH) = DISPLAY PAGE (FOR ALPHA MODES ONLY)
(CX) = COUNT OF CHARACTERS TO WRITE
(AL) = CHAR TO WRITE
(BL)
=
ATTRIBUTE OF CHARACTER (ALPHA)/COLOR OF CHAR
(GRAPHICS)
SEE NOTE ON WRITE DOT FOR BIT 7 OF BL = l.
(AH) =OAH WRITE CHARACTER ONLY AT CURRENT CURSOR POSITION
****
NOT VALID FOR MEDIUM RESOLUTION GRAPHICS
****
(BH) = DISPLAY PAGE (FOR ALPHA MODES ONLY)
(CX) = COUNT OF CHARACTERS TO WRITE
(AL) = CHAR TO WRITE
FOR READ/WRITE CHARACTER INTERFACE WHILE IN GRAPHICS MODE, THE
CHARACTERS ARE FORMED FROM A CHARACTER GENERATOR IMAGE
MAINTAINED IN THE SYSTEM ROM.
FOR WRITE CHARACTER INTERFACE IN GRAPHICS MODE, THE REPLICATION
FACTOR CONTAINED IN (CX) ON ENTRY WILL PRODUCE VALID
RESULTS ONLY FOR CHARACTERS CONTAI NED ON THE SAME ROW.
CONTINUATION TO SUCCEEDING LINES WILL NOT PRODUCE
CORRECTL Y.
GRAPH I CS INTERFACE
(AH)=OBH SET COLOR PALETTE
(BH) = PALETTE COLOR ID BEING SET (0-127)
(BL) = COLOR VALUE TO BE USED WITH THAT COLOR ID
NOTE: FOR THE CURRENT COLOR CARD, THIS ENTRY POINT
HAS MEANING ONLY FOR 320X200 GRAPHICS.
COLOR ID = 0 SELECTS THE BACKGND COLOR (0-15)
COLOR ID = 1 SELECTS THE PALETTE TO BE USED:
o
= GREEN(1)/RED(2)/YELLOW(3)
1 = CYAN(I)/MAGENTA(2)/WHITE(3)
IN 40X25 OR 80X25 ALPHA MODES, THE VALUE SET
FOR PALETTE COLOR 0 INDICATES THE
BORDER COLOR TO BE USED (VALUES 0-31,
WHERE 16-31 SELECT THE HIGH INTENSITY
BACKGROUND SET.
(AH)=OCH WRITE DOT
(DX) = ROW NUMBER
(CX) COLUMN NUMBER
(AL) = COLOR VALUE
IF BIT 7 OF AL = 1, THEN THE COLOR VALUE IS
EXCLUSIVE OR' D WITH THE CURRENT CONTENTS OF
THE DOT
(AH)=ODH READ DOT
2-80 ROM BIOS
(DX) = ROW NUMBER
(CX) = COLUMN NUMBER
ON EXIT:
(AL) = THE DOT READ