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wait.pas
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Pascal/Delphi Source File
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1995-07-28
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851b
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54 lines
program WAIT;
Uses Crt, Dos;
var oldtimer : pointer;
mscount : longint;
msready : boolean;
i : integer;
procedure WaitInt; Interrupt;
begin
dec(mscount);
if mscount = 0 then msready := true;
port [$20] := $20;
end;
procedure Wait1(ms : longint);
begin
GetIntVec(8,oldtimer);
SetIntVec(8,@waitint);
asm
cli
mov dx,43h
mov al,36h
out dx,al
sub dx,3
mov al,169
out dx,al
mov al,4
out dx,al
sti
end;
msready := false;
mscount := ms;
repeat until msready;
asm
cli
mov dx,43h
mov al,36h
out dx,al
sub dx,3
xor ax,ax
out dx,al
out dx,al
sti
end;
SetIntVec(8,oldtimer);
end;
begin
clrscr;
for i := 5 downto 1 do begin
gotoxy(10,6);
writeln('Please wait ',i,' seconds');
wait1(1000);
end;
end.