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diff --git a/src/devices/machine/applepic.h b/src/devices/machine/applepic.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+
+#ifndef MAME_DEVICES_MACHINE_APPLEPIC_H
+#define MAME_DEVICES_MACHINE_APPLEPIC_H
+
+#pragma once
+
+#include "cpu/m6502/r65c02.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> applepic_device
+
+class applepic_device : public device_t
+{
+public:
+ // construction/destruction
+ applepic_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ // callback configuration
+ auto prd_callback() { return m_prd_callback.bind(); }
+ auto pwr_callback() { return m_pwr_callback.bind(); }
+ auto hint_callback() { return m_hint_callback.bind(); }
+ auto gpout0_callback() { return m_gpout_callback[0].bind(); }
+ auto gpout1_callback() { return m_gpout_callback[1].bind(); }
+
+ // host interface
+ u8 host_r(offs_t offset);
+ void host_w(offs_t offset, u8 data);
+
+ // peripheral device requests
+ DECLARE_WRITE_LINE_MEMBER(pint_w);
+ DECLARE_WRITE_LINE_MEMBER(reqa_w);
+ DECLARE_WRITE_LINE_MEMBER(reqb_w);
+
+protected:
+ // device-level overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_resolve_objects() override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ static const std::string_view s_interrupt_names[8];
+
+ struct dma_channel
+ {
+ u8 control;
+ u16 map;
+ u16 tc;
+ };
+
+ u8 timer_r(offs_t offset);
+ void timer_w(offs_t offset, u8 data);
+ void reset_timer_interrupt();
+ u8 dma_channel_r(offs_t offset);
+ void dma_channel_w(offs_t offset, u8 data);
+ u8 scc_control_r();
+ void scc_control_w(u8 data);
+ u8 io_control_r();
+ void io_control_w(u8 data);
+ u8 timer_dpll_control_r();
+ void timer_dpll_control_w(u8 data);
+ u8 int_mask_r();
+ void int_mask_w(u8 data);
+ u8 int_reg_r();
+ void int_reg_w(u8 data);
+ void set_interrupt(int which);
+ void reset_interrupt(int which);
+ u8 host_reg_r();
+ void host_reg_w(u8 data);
+ u8 device_reg_r(offs_t offset);
+ void device_reg_w(offs_t offset, u8 data);
+
+ void internal_map(address_map &map);
+
+ // internal CPU
+ required_device<r65c02_device> m_iopcpu;
+
+ // callbacks for peripheral and host
+ devcb_read8 m_prd_callback;
+ devcb_write8 m_pwr_callback;
+ devcb_write_line m_hint_callback;
+ devcb_write_line::array<2> m_gpout_callback;
+
+ // internal state
+ u16 m_ram_address;
+ u8 m_status_reg;
+ u16 m_timer_counter;
+ u16 m_timer_latch;
+ dma_channel m_dma_channel[2];
+ u8 m_scc_control;
+ u8 m_io_control;
+ u8 m_timer_dpll_control;
+ u8 m_int_mask;
+ u8 m_int_reg;
+};
+
+// device type declaration
+DECLARE_DEVICE_TYPE(APPLEPIC, applepic_device)
+
+#endif // MAME_DEVICES_MACHINE_APPLEPIC_H