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// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************

        MCS BASIC 52 and MCS BASIC 31 board

        03/12/2009 Skeleton driver.

        2012-08-08 Made to work [Robbbert]

BASIC-52 is an official Intel release.

BASIC-31 (and variants) as found on the below url, are homebrews.

http://dsaprojects.110mb.com/electronics/8031-ah/8031-bas.html


The driver is working, however there are issues with the cpu serial code.
When started, you are supposed to press Space and the system works out
the baud rate and boots up.

However, the way the cpu is written, it actually passes bytes around, so
the auto-speed detection doesn't work as intended. Also the cpu interface
is horribly outdated and needs to be brought up to date.

So, as it stands, start the driver, then press d and g in turn until
something starts happening. Basic-52 usually starts at a very slow rate,
about 1 character per second, while Basic-31 is much faster.

Once the system starts, all input must be in uppercase. Read the manual
to discover the special features of this Basic.

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

#include "emu.h"
#include "cpu/mcs51/mcs51.h"
#include "machine/i8255.h"
#include "machine/terminal.h"


class basic52_state : public driver_device
{
public:
	basic52_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_terminal(*this, "terminal")
	{ }

	void basic52(machine_config &config);
	void basic31(machine_config &config);

protected:
	void kbd_put(u8 data);
	DECLARE_READ8_MEMBER(unk_r);
	DECLARE_READ8_MEMBER(from_term);
	void basic52_io(address_map &map);
	void basic52_mem(address_map &map);
	uint8_t m_term_data;
	required_device<mcs51_cpu_device> m_maincpu;
	required_device<generic_terminal_device> m_terminal;
};


void basic52_state::basic52_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x1fff).rom();
	map(0x2000, 0x7fff).ram();
	//AM_RANGE(0x8000, 0x9fff) AM_ROM // EPROM
	//AM_RANGE(0xc000, 0xdfff) // Expansion block
	//AM_RANGE(0xe000, 0xffff) // Expansion block
}

void basic52_state::basic52_io(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x7fff).ram();
	map(0x8000, 0x9fff).rom(); // EPROM
	map(0xa000, 0xa003).rw("ppi8255", FUNC(i8255_device::read), FUNC(i8255_device::write));  // PPI-8255
	//AM_RANGE(0xc000, 0xdfff) // Expansion block
	//AM_RANGE(0xe000, 0xffff) // Expansion block
}

/* Input ports */
static INPUT_PORTS_START( basic52 )
INPUT_PORTS_END


READ8_MEMBER(basic52_state::from_term)
{
	return m_term_data;
}

READ8_MEMBER( basic52_state::unk_r)
{
	return m_term_data; // won't boot without this
}


void basic52_state::kbd_put(u8 data)
{
	m_maincpu->set_input_line(MCS51_RX_LINE, ASSERT_LINE);
	m_maincpu->set_input_line(MCS51_RX_LINE, CLEAR_LINE);
	m_term_data = data;
}

void basic52_state::basic31(machine_config &config)
{
	/* basic machine hardware */
	I8031(config, m_maincpu, XTAL(11'059'200));
	m_maincpu->set_addrmap(AS_PROGRAM, &basic52_state::basic52_mem);
	m_maincpu->set_addrmap(AS_IO, &basic52_state::basic52_io);
	m_maincpu->port_in_cb<3>().set(FUNC(basic52_state::unk_r));
	m_maincpu->serial_tx_cb().set(m_terminal, FUNC(generic_terminal_device::write));
	m_maincpu->serial_rx_cb().set(FUNC(basic52_state::from_term));

	/* video hardware */
	GENERIC_TERMINAL(config, m_terminal, 0);
	m_terminal->set_keyboard_callback(FUNC(basic52_state::kbd_put));

	I8255(config, "ppi8255", 0);
}

void basic52_state::basic52(machine_config &config)
{
	basic31(config);
	/* basic machine hardware */
	I8052(config.replace(), m_maincpu, XTAL(11'059'200));
	m_maincpu->set_addrmap(AS_PROGRAM, &basic52_state::basic52_mem);
	m_maincpu->set_addrmap(AS_IO, &basic52_state::basic52_io);
	m_maincpu->port_in_cb<3>().set(FUNC(basic52_state::unk_r));
	m_maincpu->serial_tx_cb().set(m_terminal, FUNC(generic_terminal_device::write));
	m_maincpu->serial_rx_cb().set(FUNC(basic52_state::from_term));
}

/* ROM definition */
ROM_START( basic52 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_SYSTEM_BIOS(0, "v11", "v 1.1")
	ROMX_LOAD( "mcs-51-11.bin",  0x0000, 0x2000, CRC(4157b22b) SHA1(bd9e6869b400cc1c9b163243be7bdcf16ce72789), ROM_BIOS(0))
	ROM_SYSTEM_BIOS(1, "v11b", "v 1.1b")
	ROMX_LOAD( "mcs-51-11b.bin", 0x0000, 0x2000, CRC(a60383cc) SHA1(9515cc435e2ca3d3adb19631c03a62dfbeab0826), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(2, "v131", "v 1.3.1")
	ROMX_LOAD( "mcs-51-131.bin", 0x0000, 0x2000, CRC(6a493162) SHA1(ed1079a6b4d4dbf448e15238c5a9e4dd004e401c), ROM_BIOS(2))
ROM_END

ROM_START( basic31 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_SYSTEM_BIOS(0, "v12", "v 1.2")
	ROMX_LOAD( "mcs-51-12.bin",  0x0000, 0x2000, CRC(ee667c7c) SHA1(e69b32e69ecda2012c7113649634a3a64e984bed), ROM_BIOS(0))
	ROM_SYSTEM_BIOS(1, "v12a", "v 1.2a")
	ROMX_LOAD( "mcs-51-12a.bin", 0x0000, 0x2000, CRC(225bb2f0) SHA1(46e97643a7a5cb4c278f9e3c73d18cd93209f8bf), ROM_BIOS(1))
ROM_END

/* Driver */
/*    YEAR  NAME     PARENT   COMPAT  MACHINE  INPUT    CLASS          INIT        COMPANY  FULLNAME        FLAGS */
COMP( 1985, basic52, 0,       0,      basic52, basic52, basic52_state, empty_init, "Intel", "MCS BASIC 52", MACHINE_NO_SOUND_HW)
COMP( 1985, basic31, basic52, 0,      basic31, basic52, basic52_state, empty_init, "Intel", "MCS BASIC 31", MACHINE_NO_SOUND_HW)