spk_play.pas

program spk_play;
 
{
    Program for playing melodys on PC-Speaker.
    For GNU/Linux 64 bit version. Root priveleges needed.
    Written on FreePascal.
    Copyright (C) 2019  Artyomov Alexander
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.
 
    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
}
 
{$MODE OBJFPC}
{$ASMMODE INTEL}
 
uses SysUtils,X86;
 
procedure spkon;
begin
 asm
        push    rax
        in      al, 61h
        or      al, 03h
        out     61h, al
        pop     rax
 end;
end;
procedure spkoff;
begin
 asm
        push    rax
        in      al, 61h
        or      al, 03h
        xor     al, 03h
        out     61h, al
        pop     rax
 end;
end;
procedure spk(b : word );
var hb, lb : byte;
begin; hb := hi (b); lb := lo (b);
 asm
        push    rax
        mov     al, 0B6h
        out     43h, al
        mov     al, lb
        out     42h, al
        mov     al, hb
        out     42h, al
        pop     rax
 end;
end;
 
begin
 
// Разрешить (на уровне операционной системы) своей
// программе нужные для работы с динамиком порты
// ввода-вывода 42h, 43h и 61h. Запуск программы только от рута.
fpioperm($42, 2, 1); // fpioperm($42, 1, 1); fpioperm($43, 1, 1);
fpioperm($61, 1, 1);
 
spkon; // Включить динамик.
spk(1000); // Установить частоту воспроизведения. Частота 1193280 div tone.
Sleep(100); // Подождать.
spk(2000);
Sleep(100);
spkoff; // Выключить динамик.
 
end.