diff --git a/src/mame/drivers/simpl156.cpp b/src/mame/drivers/simpl156.cpp
index bda220440e4..106abd08749 100644
--- a/src/mame/drivers/simpl156.cpp
+++ b/src/mame/drivers/simpl156.cpp
@@ -87,6 +87,8 @@ Are the OKI M6295 clocks from Heavy Smash are correct at least for the Mitchell
  - OKI M6295(1) clock: 1.000MHz (28 / 28), sample rate = 1000000 / 132
  - OKI M6295(2) clock: 2.000MHz (28 / 14), sample rate = 2000000 / 132
 
+Clocks for both chips appear to be generated by the 223 I/O ASIC. The divider might
+even be configurable.
 
 */
 
@@ -424,11 +426,11 @@ void simpl156_state::chainrec(machine_config &config)
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
 
-	okim6295_device &okisfx(OKIM6295(config, "okisfx", 28_MHz_XTAL / 28, okim6295_device::PIN7_HIGH));
+	okim6295_device &okisfx(OKIM6295(config, "okisfx", 28_MHz_XTAL / 28, okim6295_device::PIN7_HIGH)); // divider not verified
 	okisfx.add_route(ALL_OUTPUTS, "lspeaker", 0.6);
 	okisfx.add_route(ALL_OUTPUTS, "rspeaker", 0.6);
 
-	OKIM6295(config, m_okimusic, 28_MHz_XTAL / 14, okim6295_device::PIN7_HIGH);
+	OKIM6295(config, m_okimusic, 28_MHz_XTAL / 14, okim6295_device::PIN7_HIGH); // divider not verified
 	m_okimusic->add_route(ALL_OUTPUTS, "lspeaker", 0.2);
 	m_okimusic->add_route(ALL_OUTPUTS, "rspeaker", 0.2);
 }