Hi,
My desktop machine has an Intel integrated vga chip:
00:02.0 VGA compatible controller: Intel Corporation 82G965 Integrated
Graphics Controller (rev 02)
I disassembled the code at C000: and got this:
0000c0000 55 push bp
0000c0001 aa stosb
0000c0002 58 pop ax
0000c0003 e919a8 jmp 0xba81f
0000c0006 3030 xor [bx+si], dh
0000c0008 3030 xor [bx+si], dh
0000c000a 3030 xor [bx+si], dh
0000c000c 3030 xor [bx+si], dh
0000c000e 3030 xor [bx+si], dh
0000c0010 3030 xor [bx+si], dh
0000c0012 8c18 mov [bx+si], ds
0000c0014 e97d17 jmp 0xc1794
0000c0017 234000 and ax, [bx+si+0x0]
0000c001a b00a mov al, 0xa
0000c001c 3030 xor [bx+si], dh
0000c001e 49 dec cx
How come the vga bios jumps to code that starts at an address that is
smaller than C0000?
The jump at C0014 jumps to some code that looks like the card's actual
initialization code. Any reason why this jmp is placed at offset 14h ?
Anyone here got any idea what I'm seeing?
Thanks,
S
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