Difference between
modified post 88b0 by Anonymous on Mon 14th Jan 2013 20:49
original post 87fddc by Anonymous on Mon 14th Jan 2013 19:46
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START:

1	1		START:
2	2		MOV AH,00h ;get into video mode. 00 = Set Video Mode
3	3		MOV AL,13h ;13h = 320x240x16
4	4		INT 10h
5	5		SET_VSEGMENT: ;set up video segment
6	6		MOV AX,0A000h ;point ES to VGA segment
7	7		MOV ES,AX
8	8		VALUES: ;various values used for plotting later on
9	9		MOV CX,15 ;length of line. used for REP
10	10		%macro get_offset 2 ;%1 = X and %2 = y . calculates the offset location
11	11		MOV AX,%1 ;copy X location passed to macro to AX
12	12		MOV BX,%2 ;copy Y location passed to macro to BX
13	13		MOV DI,AX ;put X location into DI
14	14		MOV DX,BX ;and Y into DX
15	15		SHL BX,8 ;Y * 2^8. same as saying Y * 256
16	16		SHL DX,6 ;Y * 2^8. same as saying Y * 64
17	17		ADD DX,BX ;add the two together
18	18		ADD DI,BX ;and add the X location
19	19		%endmacro ;end macro
20	20
21	21
22	22
23	23
24	24
25	25		; starting Y location.
26	26		MOV BX,0x64
27	27		MOV AL,0
28		-	LL1:
29		-
30	28		LL2:
31	29		push AX
32	30		push BX
33	31		get_offset AX,BX
34	32		STOSB
35	33		POP BX
36	34		POP AX
37	35		ADD AX,0x02
38	36		ADD AL,0x01
39		-	CMP AL,0xc8
	37	+	CMP AL,0x0F
40	38		JNE LL2
41	39
42	40		ADD BX,0x01
43		-	CMP BX,0xF
	41	+	CMP BX,0xc8
44		-	JNE LL1
	42	+	JNE LL2
45	43
46	44		WAIT_FOR_KEY_PRESS:
47	45		MOV AH,0x00
48	46		INT 0x16
49	47		REBOOT:
50	48		DB 0xEA
51	49		DW 0x0000
52	50		DW 0xFFFF
53	51		times 0200h - 2 - ($ - $$) db 0
54	52		SIGNATURE DW 0xAA55