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diff --git a/src/devices/bus/ti99/peb/memex.h b/src/devices/bus/ti99/peb/memex.h
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+// license:LGPL-2.1+
+// copyright-holders:Michael Zapf
+/****************************************************************************
+
+ Geneve "Memex" memory expansion
+ See memex.c for documentation
+
+ Michael Zapf, February 2011
+ February 2012: Rewritten as class
+
+*****************************************************************************/
+
+#ifndef MAME_BUS_TI99_PEB_MEMEX_H
+#define MAME_BUS_TI99_PEB_MEMEX_H
+
+#pragma once
+
+#include "peribox.h"
+#include "machine/ram.h"
+
+DECLARE_DEVICE_TYPE(TI99_MEMEX, geneve_memex_device)
+
+class geneve_memex_device : public ti_expansion_card_device
+{
+public:
+ geneve_memex_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ DECLARE_READ8Z_MEMBER(readz) override;
+ DECLARE_WRITE8_MEMBER(write) override;
+
+ DECLARE_READ8Z_MEMBER(crureadz) override { }
+ DECLARE_WRITE8_MEMBER(cruwrite) override { }
+
+protected:
+ void device_start() override;
+ void device_reset() override;
+ machine_config_constructor device_mconfig_additions() const override;
+ virtual ioport_constructor device_input_ports() const override;
+
+private:
+ bool access_enabled(offs_t offset);
+ required_device<ram_device> m_ram;
+ uint8_t m_switches;
+};
+
+#endif // MAME_BUS_TI99_PEB_MEMEX_H