VGA and SVGA

Unknown

Hi.

I hope that it's not a very stupid question, but how do i shift to vga and Svga mode in asm. I only know how to shift to 320*200 color and 640*200 black and white. I use this code

mov ah,0

mov al,4

int 10h

to shift to 320*200 color mode, and that do not look very nice.

Ren

Unknown

For Basic VGA modes, the assembler code is:

MOV AX, VidMode

INT 10h

For the SVGA VESA modes, the code is:

MOV AX, 4F02h

MOV BX, VidMode

INT 10h

Some of the SVGA VESA modes are provided below:

            GRAPHICS                                TEXT
15-bit   7-bit    Resolution   Colors   15-bit   7-bit    Columns   Rows

mode     mode                           mode     mode

number   number                         number   number

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

100h     -        640x400      256      108h     -        80        60

101h     -        640x480      256

                                        109h     -        132       25

102h     6Ah      800x600      16       10Ah     -        132       43

103h     -        800x600      256      10Bh     -        132       50

                                        10Ch     -        132       60

104h     -        1024x768     16

105h     -        1024x768     256
106h     -        1280x1024    16

107h     -        1280x1024    256



                      VESA Super VGA Standard VS911022-8
10Dh     -        320x200      32K   (1:5:5:5)

10Eh     -        320x200      64K   (5:6:5)

10Fh     -        320x200      16.8M (8:8:8)

110h     -        640x480      32K   (1:5:5:5)

111h     -        640x480      64K   (5:6:5)

112h     -        640x480      16.8M (8:8:8)

113h     -        800x600      32K   (1:5:5:5)

114h     -        800x600      64K   (5:6:5)

115h     -        800x600      16.8M (8:8:8)

116h     -        1024x768     32K   (1:5:5:5)

117h     -        1024x768     64K   (5:6:5)

118h     -        1024x768     16.8M (8:8:8)

119h     -        1280x1024    32K   (1:5:5:5)

11Ah     -        1280x1024    64K   (5:6:5)

11Bh     -        1280x1024    16.8M (8:8:8)

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