diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6cf33a7..caf0f6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -362,7 +362,7 @@ set(RAMDISK_ROOT_APPS)
 
 set(USER_SHELL_COMMAND_APPS
     help ls cat pwd cd exec pid spawn wait sleep yield
-    shutdown restart exit clear ansi ansitest fastfetch memstat fsstat taskstat userstat
+    shutdown restart exit clear ansi ansitest wavplay fastfetch memstat fsstat taskstat userstat
     shstat stats tty dmesg kbdstat mkdir touch write append cp mv grep rm
 )
 
diff --git a/cleonos/c/apps/help_main.c b/cleonos/c/apps/help_main.c
index 4df9b2c..b314777 100644
--- a/cleonos/c/apps/help_main.c
+++ b/cleonos/c/apps/help_main.c
@@ -10,6 +10,7 @@ static int ush_cmd_help(void) {
     ush_writeln("  exec|run <path|name>");
     ush_writeln("  clear");
     ush_writeln("  ansi / ansitest / color");
+    ush_writeln("  wavplay <file.wav> [steps] [ticks] / wavplay --stop");
     ush_writeln("  fastfetch [--plain]");
     ush_writeln("  memstat / fsstat / taskstat / userstat / shstat / stats");
     ush_writeln("  tty [index]");
@@ -78,4 +79,3 @@ int cleonos_app_main(void) {
 
     return (success != 0) ? 0 : 1;
 }
-
diff --git a/cleonos/c/apps/shell/shell_cmd.c b/cleonos/c/apps/shell/shell_cmd.c
index 76be2e9..c19a4b4 100644
--- a/cleonos/c/apps/shell/shell_cmd.c
+++ b/cleonos/c/apps/shell/shell_cmd.c
@@ -134,6 +134,7 @@ static int ush_cmd_help(void) {
     ush_writeln("  exec|run <path|name>");
     ush_writeln("  clear");
     ush_writeln("  ansi / ansitest / color");
+    ush_writeln("  wavplay <file.wav> [steps] [ticks] / wavplay --stop");
     ush_writeln("  fastfetch [--plain]");
     ush_writeln("  memstat / fsstat / taskstat / userstat / shstat / stats");
     ush_writeln("  tty [index]");
diff --git a/cleonos/c/apps/wavplay_main.c b/cleonos/c/apps/wavplay_main.c
new file mode 100644
index 0000000..97d605e
--- /dev/null
+++ b/cleonos/c/apps/wavplay_main.c
@@ -0,0 +1,495 @@
+#include "cmd_runtime.h"
+
+#define USH_WAVPLAY_FILE_MAX       65536ULL
+#define USH_WAVPLAY_DEFAULT_STEPS    256ULL
+#define USH_WAVPLAY_MAX_STEPS       4096ULL
+#define USH_WAVPLAY_DEFAULT_TICKS      1ULL
+#define USH_WAVPLAY_MAX_TICKS         64ULL
+#define USH_WAVPLAY_RUN_TICK_MAX     512ULL
+
+typedef struct ush_wav_info {
+    const unsigned char *data;
+    u64 data_size;
+    u64 frame_count;
+    u64 sample_rate;
+    u64 channels;
+    u64 bits_per_sample;
+    u64 block_align;
+} ush_wav_info;
+
+static unsigned char ush_wavplay_file_buf[USH_WAVPLAY_FILE_MAX + 1ULL];
+
+static unsigned int ush_wav_le16(const unsigned char *ptr) {
+    return (unsigned int)ptr[0] | ((unsigned int)ptr[1] << 8U);
+}
+
+static unsigned int ush_wav_le32(const unsigned char *ptr) {
+    return (unsigned int)ptr[0] |
+           ((unsigned int)ptr[1] << 8U) |
+           ((unsigned int)ptr[2] << 16U) |
+           ((unsigned int)ptr[3] << 24U);
+}
+
+static int ush_wav_tag_eq(const unsigned char *tag, const char *lit4) {
+    if (tag == (const unsigned char *)0 || lit4 == (const char *)0) {
+        return 0;
+    }
+
+    return (tag[0] == (unsigned char)lit4[0] &&
+            tag[1] == (unsigned char)lit4[1] &&
+            tag[2] == (unsigned char)lit4[2] &&
+            tag[3] == (unsigned char)lit4[3])
+               ? 1
+               : 0;
+}
+
+static void ush_wavplay_write_u64_dec(u64 value) {
+    char rev[32];
+    u64 len = 0ULL;
+
+    if (value == 0ULL) {
+        ush_write_char('0');
+        return;
+    }
+
+    while (value > 0ULL && len < (u64)sizeof(rev)) {
+        rev[len++] = (char)('0' + (value % 10ULL));
+        value /= 10ULL;
+    }
+
+    while (len > 0ULL) {
+        len--;
+        ush_write_char(rev[len]);
+    }
+}
+
+static void ush_wavplay_print_meta(const char *path, const ush_wav_info *info, u64 steps, u64 ticks) {
+    ush_write("wavplay: ");
+    ush_writeln(path);
+
+    ush_write("  sample_rate=");
+    ush_wavplay_write_u64_dec(info->sample_rate);
+    ush_write("Hz  channels=");
+    ush_wavplay_write_u64_dec(info->channels);
+    ush_write("  bits=");
+    ush_wavplay_write_u64_dec(info->bits_per_sample);
+    ush_write("  frames=");
+    ush_wavplay_write_u64_dec(info->frame_count);
+    ush_write_char('\n');
+
+    ush_write("  play_steps=");
+    ush_wavplay_write_u64_dec(steps);
+    ush_write("  ticks_per_step=");
+    ush_wavplay_write_u64_dec(ticks);
+    ush_write_char('\n');
+}
+
+static int ush_wav_parse(const unsigned char *buffer, u64 size, ush_wav_info *out_info) {
+    u64 offset = 12ULL;
+    int found_fmt = 0;
+    int found_data = 0;
+    u64 sample_rate = 0ULL;
+    u64 channels = 0ULL;
+    u64 bits = 0ULL;
+    u64 block_align = 0ULL;
+    const unsigned char *data = (const unsigned char *)0;
+    u64 data_size = 0ULL;
+
+    if (buffer == (const unsigned char *)0 || out_info == (ush_wav_info *)0) {
+        return 0;
+    }
+
+    if (size < 12ULL) {
+        return 0;
+    }
+
+    if (ush_wav_tag_eq(&buffer[0], "RIFF") == 0 || ush_wav_tag_eq(&buffer[8], "WAVE") == 0) {
+        return 0;
+    }
+
+    while (offset + 8ULL <= size) {
+        const unsigned char *chunk_tag = &buffer[offset];
+        u64 chunk_size = (u64)ush_wav_le32(&buffer[offset + 4ULL]);
+        u64 chunk_data = offset + 8ULL;
+        u64 next_offset;
+
+        if (chunk_data > size || chunk_size > (size - chunk_data)) {
+            return 0;
+        }
+
+        if (ush_wav_tag_eq(chunk_tag, "fmt ") != 0) {
+            if (chunk_size < 16ULL) {
+                return 0;
+            }
+
+            if (ush_wav_le16(&buffer[chunk_data + 0ULL]) != 1U) {
+                return 0;
+            }
+
+            channels = (u64)ush_wav_le16(&buffer[chunk_data + 2ULL]);
+            sample_rate = (u64)ush_wav_le32(&buffer[chunk_data + 4ULL]);
+            block_align = (u64)ush_wav_le16(&buffer[chunk_data + 12ULL]);
+            bits = (u64)ush_wav_le16(&buffer[chunk_data + 14ULL]);
+            found_fmt = 1;
+        } else if (ush_wav_tag_eq(chunk_tag, "data") != 0) {
+            data = &buffer[chunk_data];
+            data_size = chunk_size;
+            found_data = 1;
+        }
+
+        next_offset = chunk_data + chunk_size;
+
+        if ((chunk_size & 1ULL) != 0ULL) {
+            next_offset++;
+        }
+
+        if (next_offset <= offset || next_offset > size) {
+            break;
+        }
+
+        offset = next_offset;
+    }
+
+    if (found_fmt == 0 || found_data == 0) {
+        return 0;
+    }
+
+    if ((channels != 1ULL && channels != 2ULL) || (bits != 8ULL && bits != 16ULL)) {
+        return 0;
+    }
+
+    if (sample_rate == 0ULL || block_align == 0ULL) {
+        return 0;
+    }
+
+    if (data_size < block_align) {
+        return 0;
+    }
+
+    out_info->data = data;
+    out_info->data_size = data_size;
+    out_info->sample_rate = sample_rate;
+    out_info->channels = channels;
+    out_info->bits_per_sample = bits;
+    out_info->block_align = block_align;
+    out_info->frame_count = data_size / block_align;
+
+    return (out_info->frame_count > 0ULL) ? 1 : 0;
+}
+
+static u64 ush_wav_sample_deviation(const ush_wav_info *info, u64 frame_index) {
+    const unsigned char *frame;
+
+    if (info == (const ush_wav_info *)0 || info->data == (const unsigned char *)0 || info->frame_count == 0ULL) {
+        return 0ULL;
+    }
+
+    if (frame_index >= info->frame_count) {
+        frame_index = info->frame_count - 1ULL;
+    }
+
+    frame = &info->data[frame_index * info->block_align];
+
+    if (info->bits_per_sample == 8ULL) {
+        unsigned int left = (unsigned int)frame[0];
+        unsigned int dev_left = (left >= 128U) ? (left - 128U) : (128U - left);
+
+        if (info->channels == 2ULL && info->block_align >= 2ULL) {
+            unsigned int right = (unsigned int)frame[1];
+            unsigned int dev_right = (right >= 128U) ? (right - 128U) : (128U - right);
+            return (u64)((dev_left + dev_right) / 2U);
+        }
+
+        return (u64)dev_left;
+    }
+
+    if (info->bits_per_sample == 16ULL) {
+        unsigned int raw_left;
+        int sample_left;
+        unsigned int dev_left;
+
+        if (info->block_align < 2ULL) {
+            return 0ULL;
+        }
+
+        raw_left = ush_wav_le16(frame);
+        sample_left = (raw_left >= 32768U) ? ((int)raw_left - 65536) : (int)raw_left;
+        if (sample_left < 0) {
+            sample_left = -sample_left;
+        }
+        dev_left = (unsigned int)((unsigned int)sample_left >> 8U);
+
+        if (info->channels == 2ULL && info->block_align >= 4ULL) {
+            unsigned int raw_right = ush_wav_le16(frame + 2ULL);
+            int sample_right = (raw_right >= 32768U) ? ((int)raw_right - 65536) : (int)raw_right;
+            unsigned int dev_right;
+
+            if (sample_right < 0) {
+                sample_right = -sample_right;
+            }
+
+            dev_right = (unsigned int)((unsigned int)sample_right >> 8U);
+            return (u64)((dev_left + dev_right) / 2U);
+        }
+
+        return (u64)dev_left;
+    }
+
+    return 0ULL;
+}
+
+static int ush_wavplay_parse_args(const char *arg,
+                                  char *out_path,
+                                  u64 out_path_size,
+                                  u64 *out_steps,
+                                  u64 *out_ticks,
+                                  int *out_stop) {
+    char first[USH_PATH_MAX];
+    char second[32];
+    char third[32];
+    const char *rest = "";
+    const char *rest2 = "";
+    const char *rest3 = "";
+
+    if (out_path == (char *)0 || out_steps == (u64 *)0 || out_ticks == (u64 *)0 || out_stop == (int *)0) {
+        return 0;
+    }
+
+    *out_steps = USH_WAVPLAY_DEFAULT_STEPS;
+    *out_ticks = USH_WAVPLAY_DEFAULT_TICKS;
+    *out_stop = 0;
+    out_path[0] = '\0';
+
+    if (arg == (const char *)0 || arg[0] == '\0') {
+        return 0;
+    }
+
+    if (ush_split_first_and_rest(arg, first, (u64)sizeof(first), &rest) == 0) {
+        return 0;
+    }
+
+    if (ush_streq(first, "--stop") != 0 || ush_streq(first, "stop") != 0) {
+        if (rest != (const char *)0 && rest[0] != '\0') {
+            return 0;
+        }
+
+        *out_stop = 1;
+        return 1;
+    }
+
+    ush_copy(out_path, out_path_size, first);
+
+    if (rest != (const char *)0 && rest[0] != '\0') {
+        if (ush_split_first_and_rest(rest, second, (u64)sizeof(second), &rest2) == 0) {
+            return 0;
+        }
+
+        if (ush_parse_u64_dec(second, out_steps) == 0 || *out_steps == 0ULL || *out_steps > USH_WAVPLAY_MAX_STEPS) {
+            return 0;
+        }
+
+        if (rest2 != (const char *)0 && rest2[0] != '\0') {
+            if (ush_split_first_and_rest(rest2, third, (u64)sizeof(third), &rest3) == 0) {
+                return 0;
+            }
+
+            if (ush_parse_u64_dec(third, out_ticks) == 0 || *out_ticks == 0ULL || *out_ticks > USH_WAVPLAY_MAX_TICKS) {
+                return 0;
+            }
+
+            if (rest3 != (const char *)0 && rest3[0] != '\0') {
+                return 0;
+            }
+        }
+    }
+
+    return 1;
+}
+
+static int ush_cmd_wavplay(const ush_state *sh, const char *arg) {
+    char path_arg[USH_PATH_MAX];
+    char abs_path[USH_PATH_MAX];
+    ush_wav_info info;
+    u64 file_size;
+    u64 got;
+    u64 steps;
+    u64 ticks_per_step;
+    u64 stride;
+    u64 i;
+    u64 run_freq = 0ULL;
+    u64 run_ticks = 0ULL;
+    int stop_only;
+
+    if (sh == (const ush_state *)0) {
+        return 0;
+    }
+
+    if (ush_wavplay_parse_args(arg, path_arg, (u64)sizeof(path_arg), &steps, &ticks_per_step, &stop_only) == 0) {
+        ush_writeln("wavplay: usage wavplay <file.wav> [steps<=4096] [ticks<=64]");
+        ush_writeln("wavplay: usage wavplay --stop");
+        return 0;
+    }
+
+    if (stop_only != 0) {
+        (void)cleonos_sys_audio_stop();
+        ush_writeln("wavplay: stopped");
+        return 1;
+    }
+
+    if (cleonos_sys_audio_available() == 0ULL) {
+        ush_writeln("wavplay: audio device unavailable");
+        return 0;
+    }
+
+    if (ush_resolve_path(sh, path_arg, abs_path, (u64)sizeof(abs_path)) == 0) {
+        ush_writeln("wavplay: invalid path");
+        return 0;
+    }
+
+    if (cleonos_sys_fs_stat_type(abs_path) != 1ULL) {
+        ush_writeln("wavplay: file not found");
+        return 0;
+    }
+
+    file_size = cleonos_sys_fs_stat_size(abs_path);
+
+    if (file_size == (u64)-1 || file_size == 0ULL) {
+        ush_writeln("wavplay: empty or unreadable file");
+        return 0;
+    }
+
+    if (file_size > USH_WAVPLAY_FILE_MAX) {
+        ush_writeln("wavplay: file too large (max 65536 bytes)");
+        return 0;
+    }
+
+    got = cleonos_sys_fs_read(abs_path, (char *)ush_wavplay_file_buf, file_size);
+
+    if (got != file_size) {
+        ush_writeln("wavplay: read failed");
+        return 0;
+    }
+
+    if (ush_wav_parse(ush_wavplay_file_buf, got, &info) == 0) {
+        ush_writeln("wavplay: unsupported wav (need PCM 8/16-bit, mono/stereo)");
+        return 0;
+    }
+
+    if (steps > info.frame_count) {
+        steps = info.frame_count;
+    }
+
+    if (steps == 0ULL) {
+        ush_writeln("wavplay: nothing to play");
+        return 0;
+    }
+
+    if (steps < 8ULL) {
+        steps = 8ULL;
+
+        if (steps > info.frame_count) {
+            steps = info.frame_count;
+        }
+    }
+
+    ush_wavplay_print_meta(abs_path, &info, steps, ticks_per_step);
+
+    stride = info.frame_count / steps;
+    if (stride == 0ULL) {
+        stride = 1ULL;
+    }
+
+    for (i = 0ULL; i < steps; i++) {
+        u64 frame_index = i * stride;
+        u64 deviation;
+        u64 freq;
+
+        if (frame_index >= info.frame_count) {
+            frame_index = info.frame_count - 1ULL;
+        }
+
+        deviation = ush_wav_sample_deviation(&info, frame_index);
+
+        if (deviation < 4ULL) {
+            freq = 0ULL;
+        } else {
+            freq = 180ULL + (deviation * 12ULL);
+        }
+
+        if (run_ticks == 0ULL) {
+            run_freq = freq;
+            run_ticks = ticks_per_step;
+            continue;
+        }
+
+        if (freq == run_freq && (run_ticks + ticks_per_step) <= USH_WAVPLAY_RUN_TICK_MAX) {
+            run_ticks += ticks_per_step;
+            continue;
+        }
+
+        if (cleonos_sys_audio_play_tone(run_freq, run_ticks) == 0ULL) {
+            ush_writeln("wavplay: playback failed");
+            (void)cleonos_sys_audio_stop();
+            return 0;
+        }
+
+        run_freq = freq;
+        run_ticks = ticks_per_step;
+    }
+
+    if (run_ticks > 0ULL) {
+        if (cleonos_sys_audio_play_tone(run_freq, run_ticks) == 0ULL) {
+            ush_writeln("wavplay: playback failed");
+            (void)cleonos_sys_audio_stop();
+            return 0;
+        }
+    }
+
+    (void)cleonos_sys_audio_stop();
+    ush_writeln("wavplay: done");
+    return 1;
+}
+
+int cleonos_app_main(void) {
+    ush_cmd_ctx ctx;
+    ush_cmd_ret ret;
+    ush_state sh;
+    char initial_cwd[USH_PATH_MAX];
+    int has_context = 0;
+    int success = 0;
+    const char *arg = "";
+
+    ush_zero(&ctx, (u64)sizeof(ctx));
+    ush_zero(&ret, (u64)sizeof(ret));
+    ush_init_state(&sh);
+    ush_copy(initial_cwd, (u64)sizeof(initial_cwd), sh.cwd);
+
+    if (ush_command_ctx_read(&ctx) != 0) {
+        if (ctx.cmd[0] != '\0' && ush_streq(ctx.cmd, "wavplay") != 0) {
+            has_context = 1;
+            arg = ctx.arg;
+            if (ctx.cwd[0] == '/') {
+                ush_copy(sh.cwd, (u64)sizeof(sh.cwd), ctx.cwd);
+                ush_copy(initial_cwd, (u64)sizeof(initial_cwd), sh.cwd);
+            }
+        }
+    }
+
+    success = ush_cmd_wavplay(&sh, arg);
+
+    if (has_context != 0) {
+        if (ush_streq(sh.cwd, initial_cwd) == 0) {
+            ret.flags |= USH_CMD_RET_FLAG_CWD;
+            ush_copy(ret.cwd, (u64)sizeof(ret.cwd), sh.cwd);
+        }
+
+        if (sh.exit_requested != 0) {
+            ret.flags |= USH_CMD_RET_FLAG_EXIT;
+            ret.exit_code = sh.exit_code;
+        }
+
+        (void)ush_command_ret_write(&ret);
+    }
+
+    return (success != 0) ? 0 : 1;
+}
\ No newline at end of file
diff --git a/cleonos/c/include/cleonos_syscall.h b/cleonos/c/include/cleonos_syscall.h
index 9f361e8..5c9cad7 100644
--- a/cleonos/c/include/cleonos_syscall.h
+++ b/cleonos/c/include/cleonos_syscall.h
@@ -54,6 +54,9 @@ typedef unsigned long long usize;
 #define CLEONOS_SYSCALL_YIELD               45ULL
 #define CLEONOS_SYSCALL_SHUTDOWN            46ULL
 #define CLEONOS_SYSCALL_RESTART             47ULL
+#define CLEONOS_SYSCALL_AUDIO_AVAILABLE     48ULL
+#define CLEONOS_SYSCALL_AUDIO_PLAY_TONE     49ULL
+#define CLEONOS_SYSCALL_AUDIO_STOP          50ULL
 
 u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 u64 cleonos_sys_log_write(const char *message, u64 length);
@@ -103,5 +106,8 @@ u64 cleonos_sys_sleep_ticks(u64 ticks);
 u64 cleonos_sys_yield(void);
 u64 cleonos_sys_shutdown(void);
 u64 cleonos_sys_restart(void);
+u64 cleonos_sys_audio_available(void);
+u64 cleonos_sys_audio_play_tone(u64 hz, u64 ticks);
+u64 cleonos_sys_audio_stop(void);
 
 #endif
diff --git a/cleonos/c/src/syscall.c b/cleonos/c/src/syscall.c
index 46966b4..a6284f9 100644
--- a/cleonos/c/src/syscall.c
+++ b/cleonos/c/src/syscall.c
@@ -199,3 +199,16 @@ u64 cleonos_sys_shutdown(void) {
 u64 cleonos_sys_restart(void) {
     return cleonos_syscall(CLEONOS_SYSCALL_RESTART, 0ULL, 0ULL, 0ULL);
 }
+
+
+u64 cleonos_sys_audio_available(void) {
+    return cleonos_syscall(CLEONOS_SYSCALL_AUDIO_AVAILABLE, 0ULL, 0ULL, 0ULL);
+}
+
+u64 cleonos_sys_audio_play_tone(u64 hz, u64 ticks) {
+    return cleonos_syscall(CLEONOS_SYSCALL_AUDIO_PLAY_TONE, hz, ticks, 0ULL);
+}
+
+u64 cleonos_sys_audio_stop(void) {
+    return cleonos_syscall(CLEONOS_SYSCALL_AUDIO_STOP, 0ULL, 0ULL, 0ULL);
+}
diff --git a/clks/drivers/audio/pcspeaker.c b/clks/drivers/audio/pcspeaker.c
new file mode 100644
index 0000000..c1aab78
--- /dev/null
+++ b/clks/drivers/audio/pcspeaker.c
@@ -0,0 +1,126 @@
+#include <clks/audio.h>
+#include <clks/exec.h>
+#include <clks/log.h>
+#include <clks/types.h>
+
+#define CLKS_AUDIO_PIT_BASE_HZ 1193182ULL
+#define CLKS_AUDIO_FREQ_MIN      20ULL
+#define CLKS_AUDIO_FREQ_MAX   20000ULL
+#define CLKS_AUDIO_TICKS_MAX   2048ULL
+
+static clks_bool clks_audio_ready = CLKS_FALSE;
+static u64 clks_audio_played_count = 0ULL;
+
+#if defined(CLKS_ARCH_X86_64)
+static inline void clks_audio_outb(u16 port, u8 value) {
+    __asm__ volatile("outb %0, %1" : : "a"(value), "Nd"(port));
+}
+
+static inline u8 clks_audio_inb(u16 port) {
+    u8 value;
+    __asm__ volatile("inb %1, %0" : "=a"(value) : "Nd"(port));
+    return value;
+}
+
+static void clks_audio_program_pc_speaker(u64 hz) {
+    u64 divisor64 = CLKS_AUDIO_PIT_BASE_HZ / hz;
+    u16 divisor;
+    u8 control;
+
+    if (divisor64 == 0ULL) {
+        divisor64 = 1ULL;
+    }
+
+    if (divisor64 > 0xFFFFULL) {
+        divisor64 = 0xFFFFULL;
+    }
+
+    divisor = (u16)divisor64;
+    clks_audio_outb(0x43U, 0xB6U);
+    clks_audio_outb(0x42U, (u8)(divisor & 0xFFU));
+    clks_audio_outb(0x42U, (u8)((divisor >> 8) & 0xFFU));
+
+    control = clks_audio_inb(0x61U);
+    clks_audio_outb(0x61U, (u8)(control | 0x03U));
+}
+#endif
+
+static u64 clks_audio_clamp_hz(u64 hz) {
+    if (hz < CLKS_AUDIO_FREQ_MIN) {
+        return CLKS_AUDIO_FREQ_MIN;
+    }
+
+    if (hz > CLKS_AUDIO_FREQ_MAX) {
+        return CLKS_AUDIO_FREQ_MAX;
+    }
+
+    return hz;
+}
+
+void clks_audio_init(void) {
+#if defined(CLKS_ARCH_X86_64)
+    clks_audio_ready = CLKS_TRUE;
+    clks_audio_played_count = 0ULL;
+    clks_audio_stop();
+
+    clks_log(CLKS_LOG_INFO, "AUDIO", "PC SPEAKER ONLINE");
+    clks_log_hex(CLKS_LOG_INFO, "AUDIO", "PIT_BASE_HZ", CLKS_AUDIO_PIT_BASE_HZ);
+#else
+    clks_audio_ready = CLKS_FALSE;
+    clks_audio_played_count = 0ULL;
+    clks_log(CLKS_LOG_WARN, "AUDIO", "AUDIO OUTPUT NOT AVAILABLE ON THIS ARCH");
+#endif
+}
+
+clks_bool clks_audio_available(void) {
+    return clks_audio_ready;
+}
+
+clks_bool clks_audio_play_tone(u64 hz, u64 ticks) {
+    if (clks_audio_ready == CLKS_FALSE) {
+        return CLKS_FALSE;
+    }
+
+    if (ticks == 0ULL) {
+        return CLKS_TRUE;
+    }
+
+    if (ticks > CLKS_AUDIO_TICKS_MAX) {
+        ticks = CLKS_AUDIO_TICKS_MAX;
+    }
+
+    if (hz == 0ULL) {
+        clks_audio_stop();
+        (void)clks_exec_sleep_ticks(ticks);
+        return CLKS_TRUE;
+    }
+
+    hz = clks_audio_clamp_hz(hz);
+
+#if defined(CLKS_ARCH_X86_64)
+    clks_audio_program_pc_speaker(hz);
+    (void)clks_exec_sleep_ticks(ticks);
+    clks_audio_stop();
+    clks_audio_played_count++;
+    return CLKS_TRUE;
+#else
+    return CLKS_FALSE;
+#endif
+}
+
+void clks_audio_stop(void) {
+#if defined(CLKS_ARCH_X86_64)
+    u8 control;
+
+    if (clks_audio_ready == CLKS_FALSE) {
+        return;
+    }
+
+    control = clks_audio_inb(0x61U);
+    clks_audio_outb(0x61U, (u8)(control & 0xFCU));
+#endif
+}
+
+u64 clks_audio_play_count(void) {
+    return clks_audio_played_count;
+}
\ No newline at end of file
diff --git a/clks/include/clks/audio.h b/clks/include/clks/audio.h
new file mode 100644
index 0000000..279636f
--- /dev/null
+++ b/clks/include/clks/audio.h
@@ -0,0 +1,12 @@
+#ifndef CLKS_AUDIO_H
+#define CLKS_AUDIO_H
+
+#include <clks/types.h>
+
+void clks_audio_init(void);
+clks_bool clks_audio_available(void);
+clks_bool clks_audio_play_tone(u64 hz, u64 ticks);
+void clks_audio_stop(void);
+u64 clks_audio_play_count(void);
+
+#endif
\ No newline at end of file
diff --git a/clks/include/clks/driver.h b/clks/include/clks/driver.h
index 8705ce0..9dc9cca 100644
--- a/clks/include/clks/driver.h
+++ b/clks/include/clks/driver.h
@@ -10,6 +10,7 @@ enum clks_driver_kind {
     CLKS_DRIVER_KIND_BUILTIN_VIDEO = 2,
     CLKS_DRIVER_KIND_BUILTIN_TTY = 3,
     CLKS_DRIVER_KIND_ELF = 4,
+    CLKS_DRIVER_KIND_BUILTIN_AUDIO = 5,
 };
 
 enum clks_driver_state {
diff --git a/clks/include/clks/syscall.h b/clks/include/clks/syscall.h
index 2e123f0..9e15e47 100644
--- a/clks/include/clks/syscall.h
+++ b/clks/include/clks/syscall.h
@@ -51,6 +51,9 @@
 #define CLKS_SYSCALL_YIELD               45ULL
 #define CLKS_SYSCALL_SHUTDOWN            46ULL
 #define CLKS_SYSCALL_RESTART             47ULL
+#define CLKS_SYSCALL_AUDIO_AVAILABLE     48ULL
+#define CLKS_SYSCALL_AUDIO_PLAY_TONE     49ULL
+#define CLKS_SYSCALL_AUDIO_STOP          50ULL
 
 void clks_syscall_init(void);
 u64 clks_syscall_dispatch(void *frame_ptr);
diff --git a/clks/kernel/driver.c b/clks/kernel/driver.c
index 815fc14..047d99a 100644
--- a/clks/kernel/driver.c
+++ b/clks/kernel/driver.c
@@ -1,4 +1,5 @@
 #include <clks/driver.h>
+#include <clks/audio.h>
 #include <clks/elf64.h>
 #include <clks/framebuffer.h>
 #include <clks/fs.h>
@@ -115,6 +116,12 @@ static void clks_driver_register_builtins(void) {
         clks_driver_push("framebuffer", CLKS_DRIVER_KIND_BUILTIN_VIDEO, CLKS_DRIVER_STATE_FAILED, CLKS_FALSE, 0ULL, 0ULL);
         clks_driver_push("tty", CLKS_DRIVER_KIND_BUILTIN_TTY, CLKS_DRIVER_STATE_FAILED, CLKS_FALSE, 0ULL, 0ULL);
     }
+
+    if (clks_audio_available() == CLKS_TRUE) {
+        clks_driver_push("pcspeaker", CLKS_DRIVER_KIND_BUILTIN_AUDIO, CLKS_DRIVER_STATE_READY, CLKS_FALSE, 0ULL, 0ULL);
+    } else {
+        clks_driver_push("pcspeaker", CLKS_DRIVER_KIND_BUILTIN_AUDIO, CLKS_DRIVER_STATE_FAILED, CLKS_FALSE, 0ULL, 0ULL);
+    }
 }
 
 static void clks_driver_probe_driver_dir(void) {
diff --git a/clks/kernel/kmain.c b/clks/kernel/kmain.c
index a17de87..0c9085e 100644
--- a/clks/kernel/kmain.c
+++ b/clks/kernel/kmain.c
@@ -1,6 +1,7 @@
 // Kernel main function
 
 #include <clks/boot.h>
+#include <clks/audio.h>
 #include <clks/cpu.h>
 #include <clks/desktop.h>
 #include <clks/driver.h>
@@ -175,6 +176,7 @@ void clks_kernel_main(void) {
     }
 
     clks_exec_init();
+    clks_audio_init();
     clks_keyboard_init();
     clks_mouse_init();
     clks_desktop_init();
diff --git a/clks/kernel/syscall.c b/clks/kernel/syscall.c
index 92a3143..c49bb49 100644
--- a/clks/kernel/syscall.c
+++ b/clks/kernel/syscall.c
@@ -1,4 +1,5 @@
 #include <clks/cpu.h>
+#include <clks/audio.h>
 #include <clks/exec.h>
 #include <clks/fs.h>
 #include <clks/heap.h>
@@ -280,6 +281,22 @@ static u64 clks_syscall_restart(void) {
 }
 
 
+static u64 clks_syscall_audio_available(void) {
+    return (clks_audio_available() == CLKS_TRUE) ? 1ULL : 0ULL;
+}
+
+static u64 clks_syscall_audio_play_tone(u64 arg0, u64 arg1) {
+    if (clks_audio_play_tone(arg0, arg1) == CLKS_FALSE) {
+        return 0ULL;
+    }
+
+    return 1ULL;
+}
+
+static u64 clks_syscall_audio_stop(void) {
+    clks_audio_stop();
+    return 1ULL;
+}
 static u64 clks_syscall_fs_stat_type(u64 arg0) {
     char path[CLKS_SYSCALL_PATH_MAX];
     struct clks_fs_node_info info;
@@ -582,6 +599,12 @@ u64 clks_syscall_dispatch(void *frame_ptr) {
             return clks_syscall_shutdown();
         case CLKS_SYSCALL_RESTART:
             return clks_syscall_restart();
+        case CLKS_SYSCALL_AUDIO_AVAILABLE:
+            return clks_syscall_audio_available();
+        case CLKS_SYSCALL_AUDIO_PLAY_TONE:
+            return clks_syscall_audio_play_tone(frame->rbx, frame->rcx);
+        case CLKS_SYSCALL_AUDIO_STOP:
+            return clks_syscall_audio_stop();
         default:
             return (u64)-1;
     }
diff --git a/docs/syscall.md b/docs/syscall.md
index 3e8ef97..58a5e6c 100644
--- a/docs/syscall.md
+++ b/docs/syscall.md
@@ -52,7 +52,7 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 
 - `FS_MKDIR` / `FS_WRITE` / `FS_APPEND` / `FS_REMOVE` 仅允许 `/temp` 树下路径。
 
-## 4. Syscall 列表（0~47）
+## 4. Syscall 列表（0~50）
 
 ### 0 `CLEONOS_SYSCALL_LOG_WRITE`
 
@@ -350,6 +350,27 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - 返回：理论上不返回；成功路径会触发重启流程（当前 x86_64 走 8042 reset）
 - 说明：若重启流程未生效，内核会进入 halt 循环。
 
+### 48 `CLEONOS_SYSCALL_AUDIO_AVAILABLE`
+
+- 参数：无
+- 返回：
+- `1`：音频输出可用
+- `0`：当前平台无音频输出
+
+### 49 `CLEONOS_SYSCALL_AUDIO_PLAY_TONE`
+
+- 参数：
+- `arg0`: `u64 hz`（频率，`0` 表示静音等待）
+- `arg1`: `u64 ticks`（持续 tick）
+- 返回：成功 `1`，失败 `0`
+- 说明：当前实现基于 PC Speaker（x86_64），用于最小音频链路。
+
+### 50 `CLEONOS_SYSCALL_AUDIO_STOP`
+
+- 参数：无
+- 返回：当前实现固定返回 `1`
+- 说明：立即停止当前音频输出。
+
 ## 5. 用户态封装函数
 
 用户态封装位于：
@@ -366,6 +387,7 @@ u64 cleonos_syscall(u64 id, u64 arg0, u64 arg1, u64 arg2);
 - `cleonos_sys_kbd_get_char()` / `cleonos_sys_kbd_buffered()`
 - `cleonos_sys_getpid()` / `cleonos_sys_spawn_path()` / `cleonos_sys_wait_pid()`
 - `cleonos_sys_exit()` / `cleonos_sys_sleep_ticks()` / `cleonos_sys_yield()` / `cleonos_sys_shutdown()` / `cleonos_sys_restart()`
+- `cleonos_sys_audio_available()` / `cleonos_sys_audio_play_tone()` / `cleonos_sys_audio_stop()`
 
 ## 6. 开发注意事项
 
diff --git a/ramdisk/test.wav b/ramdisk/test.wav
new file mode 100644
index 0000000..44d8638
Binary files /dev/null and b/ramdisk/test.wav differ