retrieve computer's BIOS date with Delphi Pascal

How can i retrieve the computer's BIOS date with Delphi Pascal (16 bits version)?

I tried memory location Mem[$FFFF:$0005] but this gives a general protection failure

rjAsked:
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rjAuthor Commented:
Edited text of question
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sandburdCommented:
Hi,

With this little source i must work. The assembler routine gets the date. The other piece converts the date to a normal value, cause it's give in hexadecimal value's by the bios.
That's the default encoding that the bios uses for the value's, but there is a possibility that this is changed in the bios, the value's are given then binary. But i think that's not common.
I hope that this piece of code will help you.

Greetings,

Sandburd

------example code-------
var year,century,day,month:byte;
begin
 asm
    mov ah,04h
    int 1ah
    mov year,cl
    mov century,ch
    mov day, dl
    mov month, dh
 end;
 century:=(century div 16)*10 + century mod 16;
 Year:= (Year div 16)*10 +Year mod 16;
 day:=(day div 16)*10 +day mod 16;
 month:=(month div 16)*10 +month mod 16;

--------example code ends ----------
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rjAuthor Commented:
Thanks for our answer.

I copied your routine to my Delhi project.
Unfortunately it does not work. I know my computer's BIOS date is 12-19-96. Your assembler routine however returns the date of today.

I hope you have another solution.

Bye, Robbert-Jan

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sxhCommented:
hi rj

i tried the usual way of reading the bios date address using the move(mem[$FFFF:$0005],myvar,8) and gpf'ed.

This is a real mode thing !

here is the working code to read the bios date from real mode low memory.

the program uses a single form with a button and label control.

hope this helps.

--------------cut here---------------------------------------
unit Bdate;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

function allocRealModePointer(var P: pointer; Size: longInt): boolean;
var
  Selector,
  base : word;
  LinearBase : longint;

begin
  result := false;
  LinearBase := MakeLong(0,hiword(longint(p)) shr 12) +
                hiword(longint(P)) shl 4 + loword(longint(P));

  Selector := AllocSelector(DSeg);
  base := SetSelectorBase(Selector, LinearBase);
  SetSelectorLimit(Selector, Size);
  if (Selector <> 0) and (base<>0) then
    begin
      P := Ptr(Selector, 0);
      result := true;
    end;
end;

function freeRealModePointer(var p: pointer): boolean;
var
  fr : Word;
begin
  fr := FreeSelector(hiword(longint(p)));
  if (fr=0) then begin
    p := nil;
    result := true;
  end else begin
    result := false;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  P: pChar;
begin
  P := Ptr($FFFF, $0005);
  if AllocRealModePointer(Pointer(p), 8) then
    begin
      Label1.Caption := StrPas(P);
      FreeRealModePointer(Pointer(P));
    end;
end;

end.

----------cut here----------------------------------------
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rjAuthor Commented:
Thanks for your answer!
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eviltekkCommented:
try this thing:

procedure getbiosdate;
var time : datetime;
    unpacked : longint;
begin
unpacked:=ptr($FFFF,$0005)^;
unpacktime(unpacked,Time);
end;

now using time.month, time.year, time.day and time.dayofweek you can see the bios date.


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dark_waderCommented:
hey guys you don't have an idea how the protected mode workz...
you can't access it directly....
There were in BC7 some constants (or variables) that contained
system addrs so i suppose in DELPHI there should be tha same...
Or try to look thru WIN SDK help for some functions doing this

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