diff --git a/src/mame/machine/electron.c b/src/mame/machine/electron.c
index 8510fe7f454..225f4da5a7a 100644
--- a/src/mame/machine/electron.c
+++ b/src/mame/machine/electron.c
@@ -14,6 +14,7 @@
 #include "sound/beep.h"
 #include "imagedev/cassette.h"
 
+
 void electron_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
 {
 	switch (id)
@@ -246,7 +247,12 @@ WRITE8_MEMBER(electron_state::electron_ula_w)
 	case 0x06:  /* Counter divider */
 		if ( m_ula.communication_mode == 0x01)
 		{
-			m_beeper->set_frequency( 1000000 / ( 16 * ( data + 1 ) ) );
+		/* GUESS
+		 * the Advanced Users manual says this is the correct algorithm
+		 * but the divider is wrong(?), says 16 but results in high pitch, 
+		 * 32 is more close
+		 */
+			m_beeper->set_frequency( 1000000 / ( 32 * ( data + 1 ) ) );
 		}
 		break;
 	case 0x07:  /* Misc. */