Difference between
modified post 09d13b by Anonymous on Tue 15th Jan 2013 01:19
original post 88b0 by Anonymous on Mon 14th Jan 2013 20:49
Download diff
Show old version | new version | both versions

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		-	SET_VSEGMENT: ;set up video segment
	5	+	; starting X & Y location + starting colour
6		-	MOV AX,0A000h ;point ES to VGA segment
	6	+	MOV CX,0
7		-	MOV ES,AX
	7	+	MOV DX,0
8		-	VALUES: ;various values used for plotting later on
	8	+	MOV AL,0
9		-	MOV CX,15 ;length of line. used for REP
	9	+	LL1:
10		-	%macro get_offset 2 ;%1 = X and %2 = y . calculates the offset location
	10	+	MOV CX,0
11		-	MOV AX,%1 ;copy X location passed to macro to AX
	11	+	ResetAL:
12		-	MOV BX,%2 ;copy Y location passed to macro to BX
	12	+	MOV AL,0x00
13		-	MOV DI,AX ;put X location into DI
	13	+	LL2:
14		-	MOV DX,BX ;and Y into DX
	14	+	MOV AH,0x0C
15		-	SHL BX,8 ;Y * 2^8. same as saying Y * 256
	15	+	MOV BX,0x1
16		-	SHL DX,6 ;Y * 2^8. same as saying Y * 64
	16	+	INT 0x10
17		-	ADD DX,BX ;add the two together
	17	+	CMP CX,319
18		-	ADD DI,BX ;and add the X location
	18	+	JE NLINE
19		-	%endmacro ;end macro
	19	+	JNE Continue
20		-
	20	+	Continue:
21		-
	21	+	ADD CX,0x01
22		-
	22	+	ADD AL,0x01
23		-
	23	+	CMP AL,16
24		-
	24	+	JE ResetAL
25		-	; starting Y location.
	25	+	JNE LL2
26		-	MOV BX,0x64
	26	+	NLINE:
27		-	MOV AL,0
	27	+	ADD DX,1
28		-	LL2:
	28	+	CMP DX,240
29		-	push AX
	29	+	JL LL1
30		-	push BX
	30	+	WAIT_FOR_KEY_PRESS:
31		-	get_offset AX,BX
	31	+	MOV AH,0x00
32		-	STOSB
	32	+	INT 0x16
33		-	POP BX
	33	+	REBOOT:
34		-	POP AX
	34	+	DB 0xEA
35		-	ADD AX,0x02
	35	+	DW 0x0000
36		-	ADD AL,0x01
	36	+	DW 0xFFFF
37		-	CMP AL,0x0F
	37	+	times 0200h - 2 - ($ - $$) db 0
38		-	JNE LL2
	38	+	SIGNATURE DW 0xAA55
39	39
40		-	ADD BX,0x01
	40	+
41		-	CMP BX,0xc8
	41	+
42		-	JNE LL2
	42	+
43	43
44		-	WAIT_FOR_KEY_PRESS:
	44	+
45		-	MOV AH,0x00
	45	+
46		-	INT 0x16
	46	+
47		-	REBOOT:
	47	+
48		-	DB 0xEA
	48	+
49		-	DW 0x0000
	49	+
50		-	DW 0xFFFF
	50	+
51		-	times 0200h - 2 - ($ - $$) db 0
	51	+
52		-	SIGNATURE DW 0xAA55
	52	+