程序好像Qb写, 因为它的出错提示里面好像是Qb的.
(我们 通过特殊的转换器,把视频信号输出到普通电视的
显示屏, 从电脑启动到 进入程序前, 显示屏都是抖动的;
进入这个程序后就不抖了! 而且退出这个程序后也不抖
-----必须是sis6236显卡)
但是我就是不明白, 为什么这个程序针对sis6236显卡,
是不是有什么特殊的图形驱动~~~的问题!
下载:
http://www.cn-dos.net/forum/attachment.php?aid=1240&checkid=dcae1&download=1
==========================================================================================>补充
帮我看看这个Dos程序,是用什么语言写的!
还有个问题,这个程序是不是针对sis6326的显卡,做了优化!!?
-----------------------------补充---------------
我刚才找了, 好像是Qb写, 因为它的出错提示里面好像是Qb的.
但是我就是不明白, 为什么这个程序针对sis6236显卡,
(我们 通过特殊的转换器,把视频信号输出到普通电视的
显示屏, 从电脑启动到 进入程序前, 显示屏都是抖动的;
进入这个程序后就不抖了! 而且退出这个程序后也不抖
-----必须是sis6236显卡)
-----------------------------补充---------------
不是我们的产品~~~
别人那儿得到的~~~ 这个程序不能单独运行!
play==>把dos转变是图形模式, 然后在上面选择项目!
在pc的纯dos下面一切正常,但是通过特殊的转换卡,把信号输出到到显示器(普通电视的显示屏)后,
只有用sis6236显卡,屏幕才不会抖动!
----------------------------补充----------------
在IDA中反汇编,一共找到4处 int 10h
1:处========>
seg001:62F0 sub_CC90 proc near ; CODE XREF: sub_CCC3+8p
seg001:62F0 ; sub_CD1F+19p ...
seg001:62F0 push bp
seg001:62F1 push si
seg001:62F2 push di
seg001:62F3 int 10h ; - VIDEO -
seg001:62F5 pop di
seg001:62F6 pop si
seg001:62F7 pop bp
seg001:62F8 retn
seg001:62F8 sub_CC90 endp
2,3处========>
mov cx, 1
seg001:6F68
seg001:6F68 loc_D908: ; CODE XREF: sub_D8C6+4Dj
seg001:6F68 lodsb
seg001:6F69 mov ah, 9
seg001:6F6B int 10h ; - VIDEO - WRITE ATTRIBUTES/CHARACTERS AT CURSOR POSITION
seg001:6F6B ; AL = character, BH = display page
seg001:6F6B ; BL = attributes of character (alpha modes) or color (graphics modes)
seg001:6F6B ; CX = number of times to write character
seg001:6F6D inc dx
seg001:6F6E mov ah, 2
seg001:6F70 int 10h ; - VIDEO - SET CURSOR POSITION
seg001:6F70 ; DH,DL = row, column (0,0 = upper left)
seg001:6F70 ; BH = page number
seg001:6F72 dec di
seg001:6F73 jnz short loc_D908
seg001:6F75 retn
seg001:6F75 sub_D8C6 endp
4处:========>
seg001:73E0 sub_DD80 proc near ; CODE XREF: seg001:83CAp
seg001:73E0 push si
seg001:73E1 call sub_D628
seg001:73E4 mov cx, ds:3122h
seg001:73E8 call sub_CD1C
seg001:73EB mov bh, ds:3125h
seg001:73EF push bp
seg001:73F0 push si
seg001:73F1 push di
seg001:73F2 mov ah, 8
seg001:73F4 int 10h ; - VIDEO - READ ATTRIBUTES/CHARACTER AT CURSOR POSITION
seg001:73F4 ; BH = display page
seg001:73F4 ; Return: AL = character
seg001:73F4 ; AH = attribute of character (alpha modes)
seg001:73F6 pop di
seg001:73F7 pop si
seg001:73F8 pop bp
seg001:73F9 or al, al
seg001:73FB jnz short loc_DD9F
seg001:73FD mov al, 20h ; ' '
seg001:73FF
seg001:73FF loc_DD9F: ; CODE XREF: sub_DD80+1Bj
seg001:73FF xor bx, bx
seg001:7401 xchg ah, bl
seg001:7403 xchg ax, cx
seg001:7404 mov dx, ds:30FCh
seg001:7408 call sub_CD1F
seg001:740B xor ch, ch
seg001:740D xchg ax, cx
seg001:740E pop si
seg001:740F retn
seg001:740F sub_DD80 endp
令人不解的是一般dos下面比较流行的是VAG的 13h ,256 320*200 的模式
但是这几处, 看不出来是那种!!!
============================================================================================>
在国外找的资料
Program VGA_to_SCART;
{
This program sets VGA 80x25 color text mode to PAL frequencies
for VGA to TV adapter. This program is written to be an exaple
how to get PAL frequencies out of VGA card. This program
outputs noninterlaced picture at PAL frequencies (15625 Hz horizonal
and 50 Hz vertical). There is a small error in frequencies, but
TVs can handle this easily.
I have not done anything to change then font size according the TV
resolition, so part of the picture will remain out of visible TV
screen area.
This sourcecode compiles with Turbo Pascal and Borland Pascal
compilers versions 4.0 and up.
Copyright Tomi Engdahl 1994-1996
}
Uses Dos,Crt;
Const
DirectVideo=False; {forces CRT unit to use BIOS calls for output}
crtc_index=$3d4;
crtc_data=$3d5;
atc_index=$3c0;
atc_data=$3c0;
graph_index=$3ce;
graph_data=$3cf;
seq_index=$3c4;
seq_data=$3c5;
status_1=$3da;
VideoSegment=$A000;
DAC_addr=$3c8;
DAC_data=$3c9;
misc_out_write=$3C2;
misc_out_read=$3CC;
Procedure SetBiosMode(mode:byte);
Var regs:registers;
Begin
regs.AH:=$00;
regs.AL:=mode;
Intr($10,regs);
End;
Procedure SetBiosCursorType(startline,endline:byte);
Var regs:registers;
Begin
regs.AH:=$01;
regs.CH:=startline;
regs.CL:=endline;
Intr($10,regs);
End;
Procedure Offset(bytes_per_line:byte);
Begin
Port[crtc_index]:=$13; Port[crtc_data]:=bytes_per_line;
End;
Procedure sync_reset_on;
Begin
Port[seq_index]:=$00;
Port[seq_data]:=Port[seq_data] and 253;
End;
Procedure sync_reset_off;
Begin
Port[seq_index]:=$00;
Port[seq_data]:=Port[seq_data] or 2;
End;
Procedure enable_timing_writes;
Begin
Port[crtc_index]:=$11;
Port[crtc_data]:=Port[crtc_data] and 127;
Port[crtc_index]:=$3;
Port[crtc_data]:=Port[crtc_data] or 128;
End;
Procedure set_positive_syncs;
Begin
Port[misc_out_write]:=Port[misc_out_read] and 63;
End;
Begin
SetBiosMode($01);
sync_reset_on;
Port[seq_index]:=$01;
Port[seq_data]:=Port[seq_data] or 8;
sync_reset_off;
enable_timing_writes;
Port[crtc_index]:=$00; {crtc horizonal total}
Port[crtc_data]:=96; {u96}
Port[crtc_index]:=$06; {crtc vertical total}
Port[crtc_data]:=55; {u55}
Port[crtc_index]:=$10; {crtc vertical start register}
Port[crtc_data]:=30; {u30}
Port[crtc_index]:=$05; {crtc end horizonal retrace}
Port[crtc_data]:=129; {129}
Port[crtc_index]:=$11; {crtc end vertical retrace}
Port[crtc_data]:=33; {46}
Port[crtc_index]:=$12; {crtc}
Port[crtc_data]:=2; {143}
Port[crtc_index]:=$15; {crtc end}
Port[crtc_data]:=45; {150}
Port[crtc_index]:=$16; {crtc end}
Port[crtc_data]:=30; {185}
Port[crtc_index]:=$04; {horizonal retrace start}
Port[crtc_data]:=83;
set_positive_syncs;
Writeln;
Writeln;
Writeln;
Writeln('VGA text mode to TV driver version 0.1');
Writeln('Copyright by Tomi Engdahl 1994-1996');
End.
[课程]FART 脱壳王！加量不加价！FART作者讲授！
