1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
; From: David Buchanan <d@vidbuchanan.co.uk>
;
; compiles to boot sector, pass as disk to qemu to run the code.
;
BITS 16
ORG 0x7C00
mov dx, 0x3d4 ; start_addr high byte
mov al, 0x0c
out dx, al
mov dx, 0x3d5
mov al, 0xff
out dx, al
mov dx, 0x3d4 ; line_compare
mov al, 0x07
out dx, al
mov dx, 0x3d5
in al, dx
and al, ~0x10
out dx, al
mov dx, 0x3d4 ; line_compare
mov al, 0x09
out dx, al
mov dx, 0x3d5
in al, dx
and al, ~0x40
out dx, al
mov dx, 0x3ce ; gfx mode
mov al, 0x06
out dx, al
mov dx, 0x3cf
mov al, 0x01
out dx, al
jmp $
TIMES 510-($-$$) DB 0
DW 0xAA55 ; boot signature
|
