diff --git a/src/devices/cpu/pps41/mm78.h b/src/devices/cpu/pps41/mm78.h
index a858cf94f3e..14765f01749 100644
--- a/src/devices/cpu/pps41/mm78.h
+++ b/src/devices/cpu/pps41/mm78.h
@@ -39,6 +39,7 @@
    RIO5 20 |           | 23 RIO8       RIO7 20 |___________| 21 RIO8
    RIO6 21 |___________| 22 RIO7
 
+    MM78 also exists as 40-pin DIP and can have the same pinout as MM78L
 */
 
 class mm78_device : public mm76_device
diff --git a/src/devices/cpu/pps41/mm78la.cpp b/src/devices/cpu/pps41/mm78la.cpp
index 7419b031836..77996475d88 100644
--- a/src/devices/cpu/pps41/mm78la.cpp
+++ b/src/devices/cpu/pps41/mm78la.cpp
@@ -10,8 +10,8 @@
 #include "mm78la.h"
 
 
-DEFINE_DEVICE_TYPE(MM78LA, mm78la_device, "mm78la", "Rockwell MM78LA") // MM78L + output PLA and tone generator
-DEFINE_DEVICE_TYPE(MM77LA, mm77la_device, "mm77la", "Rockwell MM77LA") // MM77L + output PLA and tone generator
+DEFINE_DEVICE_TYPE(MM78LA, mm78la_device, "mm78la", "Rockwell MM78LA") // MM78L + output PLA and tone generator, no serial i/o
+DEFINE_DEVICE_TYPE(MM77LA, mm77la_device, "mm77la", "Rockwell MM77LA") // MM77L + "
 
 
 // constructor
diff --git a/src/devices/cpu/pps41/mm78la.h b/src/devices/cpu/pps41/mm78la.h
index cb611ef5dcc..a9c58ab4572 100644
--- a/src/devices/cpu/pps41/mm78la.h
+++ b/src/devices/cpu/pps41/mm78la.h
@@ -87,6 +87,7 @@ protected:
 	virtual void device_reset() override;
 	virtual void device_add_mconfig(machine_config &config) override;
 
+	// opcode handlers
 	virtual void op_ix() override;
 };
 
diff --git a/src/mame/drivers/hh_pps41.cpp b/src/mame/drivers/hh_pps41.cpp
index ec52595659d..4258cdca12a 100644
--- a/src/mame/drivers/hh_pps41.cpp
+++ b/src/mame/drivers/hh_pps41.cpp
@@ -1088,8 +1088,8 @@ ROM_END
 /***************************************************************************
 
   Mattel World Championship Football (model 3202)
-  * MM78L MCU (label MM78 A78C6-12, die label A78C6)
-  * MM78L MCU (label MM78 A78C7-12, die label A78C7)
+  * MM78 MCU (MM78L pinout) (label MM78 A78C6-12, die label A78C6)
+  * MM78 MCU (MM78L pinout) (label MM78 A78C7-12, die label A78C7)
   * 8-digit 7seg VFD, cyan/red/green VFD Itron CP5023, 1-bit sound
 
   It was patented under US4422639. Like the Baseball counterpart (mwcbaseb in
@@ -1235,7 +1235,7 @@ INPUT_PORTS_END
 void mwcfootb_state::mwcfootb(machine_config &config)
 {
 	/* basic machine hardware */
-	MM78L(config, m_maincpu, 360000); // approximation - VC osc. R=56K
+	MM78(config, m_maincpu, 360000); // approximation - VC osc. R=56K
 	m_maincpu->write_d().set(FUNC(mwcfootb_state::main_write_d));
 	m_maincpu->read_d().set(FUNC(mwcfootb_state::main_read_d));
 	m_maincpu->write_r().set(FUNC(mwcfootb_state::main_write_r));
@@ -1243,7 +1243,7 @@ void mwcfootb_state::mwcfootb(machine_config &config)
 	m_maincpu->read_sdi().set(m_subcpu, FUNC(pps41_base_device::sdo_r));
 	m_maincpu->write_ssc().set(m_subcpu, FUNC(pps41_base_device::ssc_w));
 
-	MM78L(config, m_subcpu, 360000); // osc. from maincpu
+	MM78(config, m_subcpu, 360000); // osc. from maincpu
 	m_subcpu->write_d().set(FUNC(mwcfootb_state::sub_write_d));
 	m_subcpu->write_r().set(FUNC(mwcfootb_state::sub_write_r));
 	m_subcpu->read_sdi().set(m_maincpu, FUNC(pps41_base_device::sdo_r));