Int10h, int12h, Mouse mask

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The following information is for reference only:

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Int 10 h: int 10 h, 12 h, Mouse mask, and other materials

Int 10 h	In	Out
Ah = 00 set display mode	Ah = 0 Al = video mode
Ah = 01 set the cursor type	Ah = 1 Ch = start Scan Line Cl = end Scan Line
Ah = 02 set the cursor position	Ah = 2 bH = display page DH = row DL = col	Ax = 0
Ah = 03 read cursor position	Ah = 3 bH = display page	Ax = 0 CH = start Scan Line Cl = end Scan Line DH = row DL = col
Ah = 04 read the light pen location	Ah = 4	Ah = pen Trigger Signal BX = pixel c1olumn CH = pixel row DH = character row DL = character coloumn
Ah = 05 specify display page	Ah = 5 Al = page number
Ah = 06 initialization window, roll up window	Ah = 6 Al = lines to scroll up bH = blank line attribute CH = upper row Cl = left column DH = lower row DL = right column
Ah = 07 initialization window, rolling down window	Ah = 7 Al = lines to scroll down bH = blank line attribute CH = upper row Cl = left column DH = lower row DL = right column
Ah = 08 read characters and attributes	Ah = 8 bH = page number	Ah = attribute Al = character
Ah = 09 write characters and attributes	Ah = 9 Al = character bH = page number BL = attribute Cx = number of character to write
Ah = 0a write character at current cursor	Ah = 0ah Al = character bH = page number CX = number of character to write
Ah = 0b set the color palette	Ah = 0bh bH = palette id bl = color ID
Ah = 0C write Pixel	Ah = 0ch Al = color
Ah = 0d read Pixel	Ah = 0dh bH = page number CX = pixel column dx = pixel row	Al = color
Ah = 0e text written by an electronic transmitter	Ah = 0eh Al = character bH = page number BL = foreground color
Ah = 0f current display mode	Ah = 0fh	Ah = columns Al = display modes bH = active page number
Ah = 10 set the palette register	Ah = 10 h Al = command bH = value BL = palette Reg dx = offset of pointer to 17-byte table es = segment of pointer to 17-byte table	BH = Value
Ah = 11 Character Generator	Ah = 11 h Al = command BP = offset of pointer to user table es = segment of pointer to user table
Ah = 12 change Selection	Ah = 12 h BL = command
Ah = 13 write a string	Ah = 13 h Al = mode bH = page number BL = attribute Cx = Character Count dx = start cursor position BP = offset of pointer to string es = segment of pointer to string
Ah = 1a read display code	Ah = 1ah Al = 0	Al = status bH = alternate disp code BL = active disp code
Ah = 1a write display code	Ah = 1ah Al = 1 bH = alternate disp code BL = active disp code	Al = Status
Ah = 1b return status	Ah = 1bh BX = Implementation type di = offset of pointer to empty buffer es = segment of pointer to empty Buffer	Al = status di = offset of pointer to video state buffer es = segment of pointer to video state Buffer
Ah = 1C return save/restore	Ah = 1ch Al = 0 Cx = request States	Al = status BX = Number 64-byte blocks for State
Ah = 1C save status	Ah = 1ch Al = 1 BX = offset of pointer to video state buffer Cx = request States es = segment of pointer to video state Buffer	Al = Status
Ah = 1C recovery status	Ah = 1ch Al = 2 BX = offset of pointer to video state buffer Cx = request States es = segment of pointer to video state Buffer	Al = Status
Ah = Fe: video buffer	Ah = 0feh di = offset of Physical video buffer es = segment of Physical video buffer	DI = offset of logical video buffer es = segment of logical video buffer
Ah = FF update video buffer	Ah = 0ffh Cx = number of characters modified di = offset to first character modified es = segment of logical video buffer

　

　

Int 12 h: int 10 h, 12 h, Mouse mask, and other materials

Memory fetch Service

Ax = memory size

　

Mouse screen and Mouse mask: int 10 h, 12 h, Mouse mask and other materials

Effects of screen and cursor mask:

Screen mask bit	Cursor mask bit	Resulting screen bit
0	0	0
0	0	1
1	0	Unchanged
1	1	Inverted

　

Character data of the screen:

Bit number	Description	Comments
15	Blink Control	1 = blinking character
12-14	Background Color
11	Intensity control	1 = High Intensity
8-10	Foreground color
0-7	Character	ASCII Value

　

Acceleration curve:

Part of table	Offset (decimal)	Length (in bytes)	Description
Curve lengths	0	1	Number of counts/factors in first Curve
	1	1	Number of counts/factors in second Curve
	2	1	Number of counts/factors in Third Curve
	3	1	Number of counts/factors in fourth Curve
Mouse counts	4	32	Array of counts for first Curve
	36	32	Array of counts for second Curve
	68	32	Array of counts for Third Curve
	100	32	Array of counts for fourth Curve
Scale factors	132	32	Array of scale factors for first Curve
	164	32	Array of scale factors for second Curve
	196	32	Array of scale factors for Third Curve
	228	32	Array of scale factors for fourth Curve
Curve names	260	16	ASCII string for first Curve
	276	16	ASCII string for second Curve
	292	16	ASCII string for Third Curve
	308	16	ASCII string for fourth Curve

Int 10 h, 12 h, Mouse mask, and other materials

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