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path: root/src/mame/drivers/ikt5a.cpp
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// license:BSD-3-Clause
// copyright-holders:AJR
/*******************************************************************************

    Skeleton driver for IKT-5A terminal.

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

#include "emu.h"
//#include "bus/pc_kbd/keyboards.h"
//#include "bus/pc_kbd/pc_kbdc.h"
//#include "bus/rs232/rs232.h"
#include "cpu/mcs51/mcs51.h"
#include "machine/eepromser.h"
#include "screen.h"

class ikt5a_state : public driver_device
{
public:
	ikt5a_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_eeprom(*this, "eeprom")
		, m_chargen(*this, "chargen")
	{
	}

	void ikt5a(machine_config &config);

private:
	u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);

	void eeprom_w(u8 data);
	u8 p1_r();
	void p1_w(u8 data);
	u8 p3_r();

	void prog_map(address_map &map);
	void ext_map(address_map &map);

	required_device<mcs51_cpu_device> m_maincpu;
	required_device<eeprom_serial_93cxx_device> m_eeprom;
	required_region_ptr<u8> m_chargen;
};

u32 ikt5a_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	return 0;
}

void ikt5a_state::eeprom_w(u8 data)
{
	m_eeprom->cs_write(BIT(data, 6));
	m_eeprom->di_write(BIT(data, 3));
	m_eeprom->clk_write(BIT(data, 1));
}

u8 ikt5a_state::p1_r()
{
	return 0xff;
}

void ikt5a_state::p1_w(u8 data)
{
}

u8 ikt5a_state::p3_r()
{
	return 0xdf | (m_eeprom->do_read() << 5);
}

void ikt5a_state::prog_map(address_map &map)
{
	map(0x0000, 0x3fff).rom().region("maincpu", 0);
}

void ikt5a_state::ext_map(address_map &map)
{
	map(0x6400, 0x6400).mirror(0xff).w(FUNC(ikt5a_state::eeprom_w));
	map(0x8000, 0x9fff).ram();
}

void ikt5a_state::ikt5a(machine_config &config)
{
	I80C51(config, m_maincpu, 15_MHz_XTAL / 2); // PCB 80C51BH-2 (clock uncertain)
	m_maincpu->set_addrmap(AS_PROGRAM, &ikt5a_state::prog_map);
	m_maincpu->set_addrmap(AS_IO, &ikt5a_state::ext_map);
	m_maincpu->port_in_cb<1>().set(FUNC(ikt5a_state::p1_r));
	m_maincpu->port_out_cb<1>().set(FUNC(ikt5a_state::p1_w));
	m_maincpu->port_in_cb<3>().set(FUNC(ikt5a_state::p3_r));

	EEPROM_93C06_16BIT(config, m_eeprom); // ST M9306B6

	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_raw(15_MHz_XTAL, 800, 0, 640, 375, 0, 350); // timings guessed
	screen.set_screen_update(FUNC(ikt5a_state::screen_update));
	screen.screen_vblank().set_inputline(m_maincpu, MCS51_INT0_LINE);
}

static INPUT_PORTS_START(ikt5a)
INPUT_PORTS_END

ROM_START(ikt5a) // 80C51 (+xtal 15.000) // 8k ram // RGB external, uses XT keyboard
	ROM_REGION(0x4000, "maincpu", 0)
	ROM_LOAD("ver_ih.bin",   0x0000, 0x4000, CRC(5a15b4e8) SHA1(cc0336892279b730f1596f31e129c5a898ecdc8f))

	ROM_REGION(0x2000, "chargen", 0)
	ROM_LOAD("g26.bin",      0x0000, 0x2000, CRC(657668be) SHA1(212a9eb1fb9b9c16f3cc606c6befbd913ddfa395))
ROM_END

COMP(1993, ikt5a, 0, 0, ikt5a, ikt5a, ikt5a_state, empty_init, "Creator / Fura Elektronik", "IKT-5A", MACHINE_IS_SKELETON)