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diff --git a/src/devices/bus/mtx/exp.h b/src/devices/bus/mtx/exp.h
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ MTX expansion emulation
+
+**********************************************************************/
+
+
+#ifndef MAME_BUS_MTX_EXP_H
+#define MAME_BUS_MTX_EXP_H
+
+#pragma once
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> mtx_exp_slot_device
+
+class device_mtx_exp_interface;
+
+class mtx_exp_slot_device : public device_t, public device_slot_interface
+{
+public:
+ // construction/destruction
+ template <typename T>
+ mtx_exp_slot_device(machine_config const &mconfig, char const *tag, device_t *owner, T &&slot_options, const char *default_option)
+ : mtx_exp_slot_device(mconfig, tag, owner)
+ {
+ option_reset();
+ slot_options(*this);
+ set_default_option(default_option);
+ set_fixed(false);
+ }
+
+ mtx_exp_slot_device(machine_config const &mconfig, char const *tag, device_t *owner, uint32_t clock = 0);
+
+ template <typename T> void set_program_space(T &&tag, int spacenum) { m_program.set_tag(std::forward<T>(tag), spacenum); }
+ template <typename T> void set_io_space(T &&tag, int spacenum) { m_io.set_tag(std::forward<T>(tag), spacenum); }
+
+ // callbacks
+ auto busreq_handler() { return m_busreq_handler.bind(); }
+ auto int_handler() { return m_int_handler.bind(); }
+ auto nmi_handler() { return m_nmi_handler.bind(); }
+
+ DECLARE_WRITE_LINE_MEMBER( busreq_w ) { m_busreq_handler(state); }
+ DECLARE_WRITE_LINE_MEMBER( int_w ) { m_int_handler(state); }
+ DECLARE_WRITE_LINE_MEMBER( nmi_w ) { m_nmi_handler(state); }
+
+ // address spaces we are attached to
+ required_address_space m_program;
+ required_address_space m_io;
+
+protected:
+ // device-level overrides
+ virtual void device_validity_check(validity_checker &valid) const override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ device_mtx_exp_interface *m_card;
+
+private:
+ devcb_write_line m_busreq_handler;
+ devcb_write_line m_int_handler;
+ devcb_write_line m_nmi_handler;
+};
+
+
+// ======================> device_mtx_exp_interface
+
+class device_mtx_exp_interface : public device_slot_card_interface
+{
+public:
+ // construction/destruction
+ device_mtx_exp_interface(const machine_config &mconfig, device_t &device);
+
+protected:
+ address_space &program_space() { return *m_slot->m_program; }
+ address_space &io_space() { return *m_slot->m_io; }
+
+ mtx_exp_slot_device *m_slot;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(MTX_EXP_SLOT, mtx_exp_slot_device)
+
+void mtx_expansion_devices(device_slot_interface &device);
+
+
+#endif // MAME_BUS_MTX_EXP_H