1 files changed, 27 insertions, 0 deletions
diff --git a/libc/msdos/sound.c b/libc/msdos/sound.c
new file mode 100644
index 0000000..90c474c
--- /dev/null
+++ b/libc/msdos/sound.c
@@ -0,0 +1,27 @@
+
+#include <bios.h>
+
+static int port_val = -1;
+
+sound(freq)
+unsigned freq;	/* freq is in hertz */
+{
+   if(port_val == -1 )
+      port_val = inp(0x61);
+
+   freq = 1193180L / freq;
+
+   outp(0x61, port_val|3);
+   outp(0x43, 0xb6);
+   outp(0x42, freq&0xFF);
+   outp(0x42, (freq>>8)&0xFF);
+}
+
+nosound()
+{
+   if( port_val )
+      outp(0x61, port_val);
+   else
+      outp(0x61, inp(0x61)&~3);
+}
+