assembly - MS-DOS - 是否可以对 24 位图形进行编程？

Question

是否可以在 DOS 机器上以 24 位色深编程？我知道 VGA 支持 8 位色深，但有没有办法弄出 24 位色深？对谷歌的研究一无所获。我在 FreeDOS 而不是 MS-DOS 上编程，如果这会影响答案的话。

Answer 1

是的，这是可能的。你应该阅读 VESA和 appropriate drivers . Here is several functions

然后你就可以做到:

  mov ax,4f02h
  mov bx,103h
  int 10h

如果启动了 VESA 并设置了 103h (800x600x256) 模式，这通常会为 ax 提供 004fh，例如，您可以使用 11bh (1280x1024x16M) ( http://www.delorie.com/djgpp/doc/rbinter/it/83/0.html )

更新:我附上一些来 self 非常非常非常旧的 pascal 程序的代码:

{ preserve space for vesa info structure, in asm it will look like sets of db, dw }
tmodes=array[0..0] of word;
    tvesainfo=
     record
      abSignature:array[1..4] of char;
      lwVersion,hwVersion:byte;
      pfszOEMStr:pchar;
      rAbilities:longint;
{$F+}
      pfawModes:^tmodes;
{$F-}
      abData:array[1..238] of byte;
     end;

{ just pascal function, which calls ax 4f00 int 10h, passes address of structure above to fetch information from vesa driver, can be just simplified to asm block in it }
function vesatest(var vi:tvesainfo):boolean;
var
   os,sg:word;
   res:word;
begin
 os:=seg(vi);
 sg:=ofs(vi);
 asm
  mov ax,4f00h
  mov es,os
  mov di,sg
  int 10h
  mov res,ax
 end;
 if res=$004f then vesatest:=true
  else vesatest:=false;
end;

{ call function above and display basic information about vesa driver installed }
 if vesatest(vesainfo)=false then
  begin
   writeln('This computer doesn''t have VESA');
   halt(254);
  end;
 writeln('VESA signature - ',vesainfo.abSignature);
 writeln('VESA version - ',vesainfo.hwVersion,'.',vesainfo.lwVersion);
 writeln('VESA manufacturer - ',vesainfo.pfszOEMStr);