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path: root/src/devices/cpu/m6502/xavix.cpp
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// license:BSD-3-Clause
// copyright-holders:David Haywood
/***************************************************************************

    xavix.cpp

    The dies for these are marked

    SSD 97 PA7270-107 (only seen on Ping Pong)
    SSD 98 PA7351-107
    SSD 98 PL7351-181

    6502 with custom opcodes
    integrated gfx / sound

    special notes

    0x0000-0x7fff seems to be a 'low bus' area, it is always the same regardless
                  of banking
    0x8000-0xffff is a banked area with individual code and data banks
                  0x00ff contains the DATA bank, set manually in code
                  0x00fe appears to be the current CODE bank, set with either the
                         custom opcodes, or manually (if running from lowbus only?)

***************************************************************************/

#include "emu.h"
#include "xavix.h"
#include "xavixd.h"

DEFINE_DEVICE_TYPE(XAVIX, xavix_device, "xavix", "XaviX (SSD 97 / SSD 98)")

xavix_device::xavix_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	m6502_device(mconfig, XAVIX, tag, owner, clock),
	XPC(0),
	m_lowbus_config("lowbus", ENDIANNESS_LITTLE, 8, 15)
{
	program_config.m_addr_width = 24;
	program_config.m_logaddr_width = 24;
	sprogram_config.m_addr_width = 24;
	sprogram_config.m_logaddr_width = 24;
	m_lowbus_config.m_addr_width = 15;
	m_lowbus_config.m_logaddr_width = 15;

}

xavix_device::xavix_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
	m6502_device(mconfig, type, tag, owner, clock),
	XPC(0),
	m_lowbus_config("lowbus", ENDIANNESS_LITTLE, 8, 15)
{
	program_config.m_addr_width = 24;
	program_config.m_logaddr_width = 24;
	sprogram_config.m_addr_width = 24;
	sprogram_config.m_logaddr_width = 24;
	m_lowbus_config.m_addr_width = 15;
	m_lowbus_config.m_logaddr_width = 15;
}



std::unique_ptr<util::disasm_interface> xavix_device::create_disassembler()
{
	return std::make_unique<xavix_disassembler>();
}


offs_t xavix_device::pc_to_external(u16 pc)
{
	return adr_with_codebank(pc);
}

void xavix_device::device_start()
{
	if(cache_disabled)
		mintf = std::make_unique<mi_xavix_nd>(this);
	else
		mintf = std::make_unique<mi_xavix_normal>(this);

	// bind delegates
	m_vector_callback.bind_relative_to(*owner());

	init();

	m_lowbus_space = &space(5);

	state_add(XAVIX_DATABANK, "DATBNK", m_databank).callimport().formatstr("%2s");;
	state_add(XAVIX_CODEBANK, "CODBNK", m_codebank).callimport().formatstr("%2s");
}

void xavix_device::device_reset()
{
	set_codebank(0);
	set_databank(0);
	m6502_device::device_reset();
}

// used by the xalda_idy  ( lda ($**), y )opcodes
uint8_t xavix_device::read_special(uint16_t adr)
{
	return read_full_data_sp(m_databank, adr);
}

uint8_t xavix_device::read_full_special(uint32_t adr)
{
	return read_full_data_sp((adr&0xff0000)>>16, adr&0xffff);
}


xavix_device::mi_xavix_normal::mi_xavix_normal(xavix_device *_base)
{
	base = _base;
}

uint8_t xavix_device::read_full_data(uint32_t addr)
{
	return read_full_data((addr & 0xff0000)>>16, addr & 0xffff);
}

inline uint8_t xavix_device::read_full_data(uint8_t databank, uint16_t adr)
{
	if (databank < 0x80)
	{
		if (adr < 0x8000)
		{
			if (adr == 0xfe)
				return m_codebank;
			else if (adr == 0xff)
				return databank;

			return m_lowbus_space->read_byte(adr);
		}
		else
		{
			return mintf->program->read_byte((databank << 16) | adr);
		}
	}
	else
	{
		if (adr < 0x8000)
		{
			if (adr == 0xfe)
				return m_codebank;
			else if (adr == 0xff)
				return databank;

			if ((adr & 0x7fff) >= 0x200)
			{
				return mintf->program->read_byte((databank << 16) | adr);
			}
			else
			{
				return m_lowbus_space->read_byte(adr);
			}
		}
		else
		{
			return mintf->program->read_byte((databank << 16) | adr);
		}
	}
}

uint8_t xavix_device::read_full_data_sp(uint8_t databank, uint16_t adr)
{
	if (databank < 0x80)
	{
		if (adr < 0x8000)
		{
			if (adr == 0xfe)
				return m_codebank;
			else if (adr == 0xff)
				return databank;

			return m_lowbus_space->read_byte(adr);
		}
		else
		{
			return mintf->program->read_byte((databank << 16) | adr);
		}
	}
	else
	{
		return mintf->program->read_byte((databank << 16) | adr);
	}
}


// data reads
uint8_t xavix_device::mi_xavix_normal::read(uint16_t adr)
{
	uint8_t databank = base->get_databank();
	return base->read_full_data(databank, adr);
}

uint8_t xavix_device::read_full_code(uint32_t addr)
{
	return read_full_code(mintf->cache, (addr & 0xff0000)>>16, addr & 0xffff);
}


uint8_t xavix_device::read_full_code(memory_access_cache<0, 0, ENDIANNESS_LITTLE> * space, uint8_t codebank, uint16_t adr)
{
	if (codebank < 0x80)
	{
		if (adr < 0x8000)
		{
			return m_lowbus_space->read_byte(adr);
		}
		else
		{
			return space->read_byte(codebank << 16 | adr);
		}
	}
	else
	{
		return space->read_byte(codebank << 16 | adr);
	}
}

uint8_t xavix_device::read_full_code(address_space* space, uint8_t codebank, uint16_t adr)
{
	if (codebank < 0x80)
	{
		if (adr < 0x8000)
		{
			return m_lowbus_space->read_byte(adr);
		}
		else
		{
			return space->read_byte(codebank << 16 | adr);
		}
	}
	else
	{
		return space->read_byte(codebank << 16 | adr);
	}
}


// opcode reads
uint8_t xavix_device::mi_xavix_normal::read_sync(uint16_t adr)
{
	uint8_t codebank = base->get_codebank();
	return base->read_full_code(scache, codebank, adr);
}

uint8_t xavix_device::mi_xavix_normal::read_arg(uint16_t adr)
{
	uint8_t codebank = base->get_codebank();
	return base->read_full_code(cache, codebank, adr);
}

// data writes
void xavix_device::write_full_data(uint32_t addr, uint8_t val)
{
	write_full_data((addr & 0xff0000)>>16, addr & 0xffff, val);
}


// data writes
void xavix_device::write_full_data(uint8_t databank, uint16_t adr, uint8_t val)
{
	if (databank < 0x80)
	{
		if (adr < 0x8000)
		{
			if (adr == 0xfe)
			{
				m_codebank = val;
				return;
			}
			else if (adr == 0xff)
			{
				m_databank = val;
				return;
			}

			m_lowbus_space->write_byte(adr, val);
		}
		else
		{
			mintf->program->write_byte((databank << 16) | adr, val);
		}
	}
	else
	{
		if (adr < 0x8000)
		{
			if (adr == 0xfe)
			{
				m_codebank = val;
				return;
			}
			else if (adr == 0xff)
			{
				m_databank = val;
				return;
			}

			if ((adr & 0x7fff) >= 0x200)
			{
				mintf->program->write_byte((databank << 16) | adr, val);
			}
			else
			{
				m_lowbus_space->write_byte(adr, val);
			}
		}
		else
		{
			mintf->program->write_byte((databank << 16) | adr, val);
		}
	}
}


void xavix_device::mi_xavix_normal::write(uint16_t adr, uint8_t val)
{
	uint8_t databank = base->get_databank();
	base->write_full_data(databank, adr, val);
}

xavix_device::mi_xavix_nd::mi_xavix_nd(xavix_device *_base) : mi_xavix_normal(_base)
{
}

uint8_t xavix_device::mi_xavix_nd::read_sync(uint16_t adr)
{
	uint8_t codebank = base->get_codebank();
	return base->read_full_code(sprogram, codebank, adr);
}

uint8_t xavix_device::mi_xavix_nd::read_arg(uint16_t adr)
{
	uint8_t codebank = base->get_codebank();
	return base->read_full_code(program, codebank, adr);
}

void xavix_device::set_codebank(uint8_t bank)
{
//  space().write_byte(0xfe, bank);
	m_codebank = bank;
}

inline uint8_t xavix_device::get_codebank()
{
//  return space().read_byte(0xfe);
	return m_codebank;
}

inline void xavix_device::set_databank(uint8_t bank)
{
//  space().write_byte(0xff, bank);
	m_databank = bank;
}

inline uint8_t xavix_device::get_databank()
{
//  return space().read_byte(0xff);
	return m_databank;
}

device_memory_interface::space_config_vector xavix_device::memory_space_config() const
{
	if(has_configured_map(AS_OPCODES))
		return space_config_vector {
			std::make_pair(AS_PROGRAM, &program_config),
			std::make_pair(AS_OPCODES, &sprogram_config),
			std::make_pair(5, &m_lowbus_config)
		};
	else
		return space_config_vector {
			std::make_pair(AS_PROGRAM, &program_config),
			std::make_pair(5, &m_lowbus_config)
		};
}



void xavix_device::state_import(const device_state_entry &entry)
{
	m6502_device::state_import(entry);

	switch(entry.index())
	{
	case XAVIX_DATABANK:
		break;
	case XAVIX_CODEBANK:
		break;
	}
}

void xavix_device::state_string_export(const device_state_entry &entry, std::string &str) const
{
	m6502_device::state_string_export(entry, str);

	switch(entry.index())
	{
	case XAVIX_DATABANK:
		str = string_format("%02x", m_databank);
		break;
	case XAVIX_CODEBANK:
		str = string_format("%02x", m_codebank);
		break;
	}
}




#include "cpu/m6502/xavix.hxx"