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+/***************************************************************************
+
+ er2055.h
+
+ GI 512 bit electrically alterable read-only memory.
+
+****************************************************************************
+
+ Copyright Aaron Giles
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name 'MAME' nor the names of its contributors may be
+ used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __ER2055_H__
+#define __ER2055_H__
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_ER2055_ADD(_tag) \
+ MCFG_DEVICE_ADD(_tag, ER2055, 0) \
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+
+// ======================> er2055_device
+
+class er2055_device : public device_t,
+ public device_memory_interface,
+ public device_nvram_interface
+{
+public:
+ // construction/destruction
+ er2055_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // I/O operations
+ UINT8 data() const { return m_data; }
+ void set_address(UINT8 address) { m_address = address & 0x3f; }
+ void set_data(UINT8 data) { m_data = data; }
+
+ // control lines -- all lines are specified as active-high (even CS2)
+ void set_control(UINT8 cs1, UINT8 cs2, UINT8 c1, UINT8 c2, UINT8 ck);
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+
+ // device_memory_interface overrides
+ virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
+
+ // device_nvram_interface overrides
+ virtual void nvram_default();
+ virtual void nvram_read(emu_file &file);
+ virtual void nvram_write(emu_file &file);
+
+ static const int SIZE_DATA = 0x40;
+
+ static const UINT8 CK = 0x01;
+ static const UINT8 C1 = 0x02;
+ static const UINT8 C2 = 0x04;
+ static const UINT8 CS1 = 0x08;
+ static const UINT8 CS2 = 0x10;
+
+ // configuration state
+ address_space_config m_space_config;
+
+ // internal state
+ UINT8 m_control_state;
+ UINT8 m_address;
+ UINT8 m_data;
+};
+
+
+// device type definition
+extern const device_type ER2055;
+
+
+#endif