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diff --git a/src/mess/machine/ti99/memex.h b/src/mess/machine/ti99/memex.h
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+/****************************************************************************
+
+ Geneve "Memex" memory expansion
+ See memex.c for documentation
+
+ Michael Zapf, February 2011
+ February 2012: Rewritten as class
+
+*****************************************************************************/
+
+#ifndef __MEMEXMEM__
+#define __MEMEXMEM__
+
+#include "emu.h"
+#include "ti99defs.h"
+#include "peribox.h"
+
+extern const device_type TI99_MEMEX;
+
+class geneve_memex_device : public ti_expansion_card_device
+{
+public:
+ geneve_memex_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+ DECLARE_READ8Z_MEMBER(readz);
+ DECLARE_WRITE8_MEMBER(write);
+
+ void crureadz(offs_t offset, UINT8 *value) { };
+ void cruwrite(offs_t offset, UINT8 value) { };
+
+protected:
+ void device_start();
+ void device_reset();
+ ioport_constructor device_input_ports() const;
+ const rom_entry *device_rom_region() const;
+
+private:
+ bool access_enabled(offs_t offset);
+
+ UINT8* m_ram;
+ UINT8 m_dip_switch[8];
+ int m_genmod;
+};
+
+#endif