From e6ab3c6eb7333aa3a5e4c95297d7ed7af805ad05 Mon Sep 17 00:00:00 2001
From: Stephen White <pi1541contact@gmail.com>
Date: Mon, 30 Dec 2019 18:58:32 +1100
Subject: [PATCH] Stopped P0 version of 1581 outputing a signal on the sound
 GPIO as the sound is disabled on the Pi 0.

---
 src/iec_bus.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/iec_bus.h b/src/iec_bus.h
index ce42864..b549b0a 100644
--- a/src/iec_bus.h
+++ b/src/iec_bus.h
@@ -471,8 +471,10 @@ public:
 		if (OutputLED) set |= 1 << PIGPIO_OUT_LED;
 		else clear |= 1 << PIGPIO_OUT_LED;
 
+#if not defined(EXPERIMENTALZERO)
 		if (OutputSound) set |= 1 << PIGPIO_OUT_SOUND;
 		else clear |= 1 << PIGPIO_OUT_SOUND;
+#endif
 
 		write32(ARM_GPIO_GPSET0, set);
 		write32(ARM_GPIO_GPCLR0, clear);