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// license:BSD-3-Clause
// copyright-holders:hap
// thanks-to:Sean Riddle
/******************************************************************************
Mattel Computer Chess
Hardware notes:
- INS8050 CPU @ 6MHz (4KB internal ROM, 256 bytes internal RAM)
- 2*HLCD0569(also seen with 2*HLCD0601, functionally same?)
- custom LCD screen with chess squares background
It was also released in the USSR as Электроника ИМ-29 Шахматный партнёр,
assumed to be an unlicensed clone.
******************************************************************************/
#include "emu.h"
#include "cpu/mcs48/mcs48.h"
#include "video/hlcd0515.h"
#include "screen.h"
// internal artwork
#include "mchess.lh" // clickable
namespace {
class mchess_state : public driver_device
{
public:
mchess_state(const machine_config &mconfig, device_type type, const char *tag) :
driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_lcd(*this, "lcd%u", 0),
m_inputs(*this, "IN.%u", 0),
m_out_x(*this, "%u.%u.%u", 0U, 0U, 0U)
{ }
void mchess(machine_config &config);
DECLARE_INPUT_CHANGED_MEMBER(reset_switch) { update_reset(newval); }
protected:
virtual void machine_start() override;
virtual void machine_reset() override;
private:
// devices/pointers
required_device<mcs48_cpu_device> m_maincpu;
required_device_array<hlcd0569_device, 2> m_lcd;
required_ioport_array<4> m_inputs;
output_finder<2, 8, 22> m_out_x;
void update_reset(ioport_value state);
// I/O handlers
template<int Sel> void lcd_output_w(offs_t offset, u32 data);
void input_w(u8 data);
u8 input_r();
void lcd_w(u8 data);
u8 lcd_r();
u8 m_inp_mux = 0;
u8 m_lcd_control = 0;
};
void mchess_state::machine_start()
{
// resolve handlers
m_out_x.resolve();
// register for savestates
save_item(NAME(m_inp_mux));
save_item(NAME(m_lcd_control));
}
void mchess_state::machine_reset()
{
update_reset(m_inputs[3]->read());
}
void mchess_state::update_reset(ioport_value state)
{
// battery is disconnected from CPU VCC pin when power switch is in SAVE mode
// (at reboot, the game will read the chessboard positions from LCD RAM)
m_maincpu->set_input_line(INPUT_LINE_RESET, state ? ASSERT_LINE : CLEAR_LINE);
}
/******************************************************************************
I/O
******************************************************************************/
template<int Sel>
void mchess_state::lcd_output_w(offs_t offset, u32 data)
{
int enabled = ~m_inputs[3]->read() & m_lcd_control & 1;
// output to x.y.z where x = chip, y = row, z = col
// up to 22 columns used
for (int i = 0; i < 22; i++)
m_out_x[Sel][offset][i] = BIT(data, i) & enabled;
}
void mchess_state::input_w(u8 data)
{
// d0,d5,d6: input mux
m_inp_mux = (~data >> 4 & 6) | (~data & 1);
}
u8 mchess_state::input_r()
{
u8 data = 0;
// d1-d4,d7: multiplexed inputs
for (int i = 0; i < 3; i++)
if (BIT(m_inp_mux, i))
data |= m_inputs[i]->read();
return ~data;
}
void mchess_state::lcd_w(u8 data)
{
// d0: both LCDC VDRIVE
// d1: N/C
// d3: 1st LCDC _CS
// d6: 2nd LCDC _CS
m_lcd[0]->cs_w(BIT(data, 3));
m_lcd[1]->cs_w(BIT(data, 6));
// d4: both LCDC CLOCK
// d5: both LCDC DATA IN
for (int i = 0; i < 2; i++)
{
m_lcd[i]->data_w(BIT(data, 5));
m_lcd[i]->clock_w(BIT(~data, 4));
}
m_lcd_control = data;
}
u8 mchess_state::lcd_r()
{
// d2: 1st LCDC DATA OUT
// d7: 2nd LCDC DATA OUT
u8 r0 = m_lcd[0]->data_r();
u8 r1 = m_lcd[1]->data_r();
return ~0x84 | r0 << 2 | r1 << 7;
}
/******************************************************************************
Input Ports
******************************************************************************/
static INPUT_PORTS_START( mchess )
PORT_START("IN.0")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_3) PORT_NAME("Player vs. Player")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_2) PORT_NAME("Machine vs. Machine")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_NAME("Player vs. Machine")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_L) PORT_NAME("Level")
PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
PORT_START("IN.1")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_SPACE) PORT_NAME("Move")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_RIGHT) PORT_NAME("Right")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_LEFT) PORT_NAME("Left")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_UP) PORT_NAME("Up")
PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_DOWN) PORT_NAME("Down")
PORT_START("IN.2")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_ENTER) PORT_CODE(KEYCODE_ENTER_PAD) PORT_NAME("Enter Move")
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_E) PORT_NAME("Enter Position")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_BACKSPACE) PORT_CODE(KEYCODE_DEL) PORT_NAME("Clear")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_C) PORT_NAME("Color")
PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_B) PORT_NAME("Take Back")
PORT_START("IN.3")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER) PORT_CODE(KEYCODE_F1) PORT_TOGGLE PORT_CHANGED_MEMBER(DEVICE_SELF, mchess_state, reset_switch, 0) PORT_NAME("Save Switch")
INPUT_PORTS_END
/******************************************************************************
Machine Configs
******************************************************************************/
void mchess_state::mchess(machine_config &config)
{
// basic machine hardware
I8050(config, m_maincpu, 6_MHz_XTAL);
m_maincpu->p1_out_cb().set(FUNC(mchess_state::input_w));
m_maincpu->p1_in_cb().set(FUNC(mchess_state::input_r));
m_maincpu->p2_out_cb().set(FUNC(mchess_state::lcd_w));
m_maincpu->p2_in_cb().set(FUNC(mchess_state::lcd_r));
// video hardware
HLCD0569(config, m_lcd[0], 500); // C=0.01uF
m_lcd[0]->write_cols().set(FUNC(mchess_state::lcd_output_w<0>));
HLCD0569(config, m_lcd[1], 500); // C=0.01uF
m_lcd[1]->write_cols().set(FUNC(mchess_state::lcd_output_w<1>));
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_SVG));
screen.set_refresh_hz(60);
screen.set_size(977, 1080);
screen.set_visarea_full();
config.set_default_layout(layout_mchess);
}
/******************************************************************************
ROM Definitions
******************************************************************************/
ROM_START( mchess )
ROM_REGION( 0x1000, "maincpu", 0 )
ROM_LOAD("ins8050-6hwu_n", 0x0000, 0x1000, CRC(de272323) SHA1(9ba323b614504e20b25c86d290c0667f0bbf6c6b) )
ROM_REGION( 796406, "screen", 0)
ROM_LOAD("mchess.svg", 0, 796406, CRC(795d66e0) SHA1(5f786c00bf33793bfba7065d8e9ec476e02e5c46) )
ROM_END
} // anonymous namespace
/******************************************************************************
Drivers
******************************************************************************/
// YEAR NAME PARENT CMP MACHINE INPUT CLASS INIT COMPANY, FULLNAME, FLAGS
CONS( 1980, mchess, 0, 0, mchess, mchess, mchess_state, empty_init, "Mattel Electronics", "Computer Chess (Mattel)", MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND_HW | MACHINE_CLICKABLE_ARTWORK )
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