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====== Воспроизведение мелодий через встроенный динамик компьютера (PC-Speaker) в GNU/Linux ======

Демонстрационная программа: [[http://soft.self-made-free.ru/spk_play.pas|spk_play.pas]]

<code pascal>
program spk_play;

{
    Program for playing melodys on PC-Speaker.
    For GNU/Linux 64 bit version. Root priveleges needed.
    Version: 2.
    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}
{$CODEPAGE UTF8}

uses SysUtils,X86;

procedure spkon; assembler;
asm
        push    rax
        in      al, 61h
        or      al, 03h
        out     61h, al
        pop     rax
end;
procedure spkoff; assembler;
asm
        push    rax
        in      al, 61h
        or      al, 03h
        xor     al, 03h
        out     61h, al
        pop     rax
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.
</code>

Юнит: [[http://soft.self-made-free.ru/spkunit.pas|spkunit.pas]]

<code pascal>
unit spkunit;

{$MODE OBJFPC}
{$ASMMODE INTEL}
{$CODEPAGE UTF8}

{
    Unit for playing melodys on PC-Speaker.
    For GNU/Linux 64 bit version. Root priveleges needed.
    Version: 3.
    Written on FreePascal (https://freepascal.org/).
    Copyright (C) 2000-2019  Artyomov Alexander
    http://self-made-free.ru/ (Ex http://aralni.narod.ru/)
    aralni@mail.ru

    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/>.
}

interface

uses X86;

procedure spk(b : word); procedure spkon; procedure spkoff;

implementation

procedure spkon; assembler;
asm
        push    rax
        in      al, 61h
        or      al, 03h
        out     61h, al
        pop     rax
end;
procedure spkoff; assembler;
asm
        push    rax
        in      al, 61h
        or      al, 03h
        xor     al, 03h
        out     61h, al
        pop     rax
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;

initialization

fpioperm($42, 2, 1);
fpioperm($61, 1, 1);

end.
</code>