diff --git a/src/devices/bus/amiga/keyboard/a1200.cpp b/src/devices/bus/amiga/keyboard/a1200.cpp
index 7b79d75a3e8..c9588ca0a8a 100644
--- a/src/devices/bus/amiga/keyboard/a1200.cpp
+++ b/src/devices/bus/amiga/keyboard/a1200.cpp
@@ -13,6 +13,8 @@
 #include "a1200.h"
 #include "matrix.h"
 
+#include "cpu/m6805/m68hc05.h"
+
 //#define VERBOSE 1
 #include "logmacro.h"
 
@@ -50,7 +52,7 @@ INPUT_PORTS_END
 MACHINE_CONFIG_FRAGMENT(a1200kbd_revB)
 	MCFG_CPU_ADD("mpu", M68HC705C8A, XTAL_3MHz)
 	MCFG_M68HC05_PORTB_R_CB(READ8(a1200_kbd_device, mpu_portb_r));
-	MCFG_M68HC05_PORTD_R_CB(READ8(a1200_kbd_device, mpu_portd_r));
+	MCFG_M68HC05_PORTD_R_CB(IOPORT("MOD"));
 	MCFG_M68HC05_PORTA_W_CB(WRITE8(a1200_kbd_device, mpu_porta_w));
 	MCFG_M68HC05_PORTB_W_CB(WRITE8(a1200_kbd_device, mpu_portb_w));
 	MCFG_M68HC05_PORTC_W_CB(WRITE8(a1200_kbd_device, mpu_portc_w));
@@ -75,7 +77,6 @@ a1200_kbd_device::a1200_kbd_device(machine_config const &mconfig, char const *ta
 	: device_t(mconfig, A1200_KBD, "Amiga 1200 Keyboard Rev B", tag, owner, clock, "a1200kbd_rb", __FILE__)
 	, device_amiga_keyboard_interface(mconfig, *this)
 	, m_rows(*this, "ROW%u", 0)
-	, m_modifiers(*this, "MOD")
 	, m_mpu(*this, "mpu")
 	, m_row_drive(0xffff)
 	, m_host_kdat(true)
@@ -105,11 +106,6 @@ READ8_MEMBER(a1200_kbd_device::mpu_portb_r)
 	return result;
 }
 
-READ8_MEMBER(a1200_kbd_device::mpu_portd_r)
-{
-	return m_modifiers->read();
-}
-
 WRITE8_MEMBER(a1200_kbd_device::mpu_porta_w)
 {
 	m_row_drive = (m_row_drive & 0xff00) | u16(u8(data | ~mem_mask));
diff --git a/src/devices/bus/amiga/keyboard/a1200.h b/src/devices/bus/amiga/keyboard/a1200.h
index b2cbd511e1a..f29689b18e3 100644
--- a/src/devices/bus/amiga/keyboard/a1200.h
+++ b/src/devices/bus/amiga/keyboard/a1200.h
@@ -12,7 +12,6 @@
 #pragma once
 
 #include "keyboard.h"
-#include "cpu/m6805/m68hc05.h"
 
 
 //**************************************************************************
@@ -39,9 +38,8 @@ public:
 	// from host
 	virtual DECLARE_WRITE_LINE_MEMBER(kdat_w) override;
 
-	// mpu I/O
+	// MPU I/O
 	DECLARE_READ8_MEMBER(mpu_portb_r);
-	DECLARE_READ8_MEMBER(mpu_portd_r);
 	DECLARE_WRITE8_MEMBER(mpu_porta_w);
 	DECLARE_WRITE8_MEMBER(mpu_portb_w);
 	DECLARE_WRITE8_MEMBER(mpu_portc_w);
@@ -56,12 +54,11 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	required_ioport_array<15>       m_rows;
-	required_ioport                 m_modifiers;
-	required_device<m68hc05_device> m_mpu;
+	required_ioport_array<15>   m_rows;
+	required_device<cpu_device> m_mpu;
 
-	u16                             m_row_drive;
-	bool                            m_host_kdat, m_mpu_kdat;
+	u16                         m_row_drive;
+	bool                        m_host_kdat, m_mpu_kdat;
 };
 
 } } } // namespace bus::amiga::keyboard