Return SuperVGA Mode Information
|
Input |
Output |
|
AX
|
4Fh |
01h |
Status |
4Fh=Supported |
AX |
|
BX
|
|
|
|
|
BX |
|
CX
|
Desired
Mode |
|
|
CX |
|
DX
|
|
|
|
|
DX |
| ES:DI |
256
byte buffer |
|
ES:DI |
Buffer Layout:
0 WORD Mode Attributes
| Mode
Attributes |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
0001h |
Mode supported by
current display |
| 1 |
2 |
0002h |
Optional INFO block is
valid |
| 2 |
4 |
0004h |
BIOS text functions
are supported |
| 3 |
8 |
0008h |
Color Mode |
| 4 |
16 |
0010h |
Graphics Mode |
| 5 |
32 |
0020h |
Unused |
| 6 |
64 |
0040h |
| 7 |
128 |
0080h |
| 8 |
256 |
0100h |
| 9 |
512 |
0200h |
| 10 |
1024 |
0400h |
| 11 |
2048 |
0800h |
| 12 |
4096 |
1000h |
| 13 |
8192 |
2000h |
| 14 |
16384 |
4000h |
| 15 |
32768 |
8000h |
2 BYTE Window A Attributes
| Window
A Attributes |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
Window is supported |
| 1 |
2 |
02h |
Window is readable |
| 2 |
4 |
04h |
Window is writable |
| 3 |
8 |
08h |
Not used |
| 4 |
16 |
10h |
| 5 |
32 |
20h |
| 6 |
64 |
40h |
| 7 |
128 |
80h |
3 BYTE Window B Attributes
| Window
B Attributes |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
01h |
Window is supported |
| 1 |
2 |
02h |
Window is readable |
| 2 |
4 |
04h |
Window is writable |
| 3 |
8 |
08h |
Not used |
| 4 |
16 |
10h |
| 5 |
32 |
20h |
| 6 |
64 |
40h |
| 7 |
128 |
80h |
4 WORD Window Granularity (smallest increment that can
be used in selecting the start address of a
display page window)
6 WORD Window Size (Display page memory size in K)
8 WORD Window A Segment
10 WORD Window B Segment
12 DWORD Pointer to Display Memory Windowing function
16 WORD Bytes per scan line
The following fields are optional:
18 WORD Horizontal resolution
20 WORD Vertical resolution
22 BYTE Character cell width in pixels
23 BYTE Character cell height in pixels
24 BYTE Number of memory planes
25 BYTE Bits per pixel
26 BYTE Number of Banks
27 BYTE Memory Model
0 = Text mode
1 = CGA graphics
2 = Hercules graphics
3 = 4 plane graphics
4 = Packed pixel graphics
5 = Nonchain 4, 256-color graphics
6-0F = Reserved by VESA
10-FF = Manufacture defined
28 BYTE Bank size |