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path: root/src/mame/drivers/ktm3.cpp
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// license:BSD-3-Clause
// copyright-holders:AJR
/*******************************************************************************

    KTM-3 (c) 1980 Synertek Systems Corp.

    This is a sort of single-board video display terminal. The second 6502,
    which uses part of the same program ROM as the first 6502 and runs on the
    inverse phases of its clock, appears to function as a crude CRTC,
    generating character addresses and sync signals with its address outputs.

    Only a few address lines are decoded at all. The resulting mirroring might
    not be accurately emulated yet.

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

#include "emu.h"

#include "bus/rs232/rs232.h"
#include "cpu/m6502/m6502.h"
#include "machine/clock.h"
#include "machine/mos6551.h"
#include "screen.h"

class ktm3_state : public driver_device
{
public:
	ktm3_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_pcpu(*this, "pcpu")
		, m_vcpu(*this, "vcpu")
		, m_acia(*this, "acia")
		, m_key_matrix(*this, "KEY%u", 0U)
		, m_option_sw(*this, "OPTION")
		, m_chargen(*this, "chargen")
		, m_ram(*this, "ram%u", 0U)
	{
	}

	void ktm3(machine_config &config);

	DECLARE_READ_LINE_MEMBER(ac_r);
	template <int N> DECLARE_READ_LINE_MEMBER(sw_r);

protected:
	virtual void machine_start() override;

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

	u8 allram_r(offs_t offset);
	void allram_w(offs_t offset, u8 data);
	u8 keyboard_r(offs_t offset);

	void pcpu_map(address_map &map);
	void vcpu_map(address_map &map);

	DECLARE_WRITE_LINE_MEMBER(signal_w);

	required_device<cpu_device> m_pcpu;
	required_device<cpu_device> m_vcpu;
	required_device<mos6551_device> m_acia;
	required_ioport_array<10> m_key_matrix;
	required_ioport m_option_sw;
	required_region_ptr<u8> m_chargen;
	required_shared_ptr_array<u8, 2> m_ram;

	bool m_signal;
};

void ktm3_state::machine_start()
{
	m_acia->write_cts(0);

	save_item(NAME(m_signal));
}

u32 ktm3_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	return 0;
}

u8 ktm3_state::allram_r(offs_t offset)
{
	return m_ram[0][offset] & m_ram[1][offset];
}

void ktm3_state::allram_w(offs_t offset, u8 data)
{
	m_ram[0][offset] = m_ram[1][offset] = data;
}

u8 ktm3_state::keyboard_r(offs_t offset)
{
	u8 ret = 0xff;

	for (int i = 0; i < 10; i++)
		if (BIT(offset, i))
			ret &= m_key_matrix[i]->read();

	return ret ^ 0xff;
}

void ktm3_state::pcpu_map(address_map &map)
{
	map(0x0000, 0x03ff).mirror(0xf000).rw(FUNC(ktm3_state::allram_r), FUNC(ktm3_state::allram_w));
	map(0x0400, 0x0400).mirror(0xe3ff).portr("SPECIAL");
	map(0x0800, 0x0bff).mirror(0xe000).r(FUNC(ktm3_state::keyboard_r));
	map(0x1400, 0x17ff).mirror(0xe000).ram().share("ram0"); // 2x SY2114L-3
	map(0x1800, 0x1bff).mirror(0xc000).ram().share("ram1"); // 2x SY2114L-3
	map(0x3800, 0x3fff).mirror(0xc000).rom().region("program", 0x000);
	map(0x5c00, 0x5c03).mirror(0x83fc).rw(m_acia, FUNC(mos6551_device::read), FUNC(mos6551_device::write));
}

void ktm3_state::vcpu_map(address_map &map)
{
	map(0x0000, 0x00ff).mirror(0xf800).rw(FUNC(ktm3_state::allram_r), FUNC(ktm3_state::allram_w));
	map(0x0100, 0x01ff).mirror(0xfc00).rom().region("program", 0x000);
	map(0x0300, 0x03ff).mirror(0xfc00).rom().region("program", 0x100);
}

WRITE_LINE_MEMBER(ktm3_state::signal_w)
{
	m_signal = state;
}

READ_LINE_MEMBER(ktm3_state::ac_r)
{
	return m_signal;
}

template <int N>
READ_LINE_MEMBER(ktm3_state::sw_r)
{
	return BIT(m_option_sw->read(), N);
}

static INPUT_PORTS_START(ktm3)
	PORT_START("KEY0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('1') PORT_CHAR('!') PORT_CODE(KEYCODE_1)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x1b) PORT_NAME("Esc") PORT_CODE(KEYCODE_TAB)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('9') PORT_CHAR(')') PORT_CODE(KEYCODE_9)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('i') PORT_CHAR('I') PORT_CODE(KEYCODE_I)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('k') PORT_CHAR('K') PORT_CODE(KEYCODE_K)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('a') PORT_CHAR('A') PORT_CODE(KEYCODE_A)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('z') PORT_CHAR('Z') PORT_CODE(KEYCODE_Z)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(UCHAR_SHIFT_1) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT)

	PORT_START("KEY1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('2') PORT_CHAR('"') PORT_CODE(KEYCODE_2)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('q') PORT_CHAR('Q') PORT_CODE(KEYCODE_Q)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('0') PORT_CODE(KEYCODE_0)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('o') PORT_CHAR('O') PORT_CODE(KEYCODE_O)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('l') PORT_CHAR('L') PORT_CODE(KEYCODE_L)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('s') PORT_CHAR('S') PORT_CODE(KEYCODE_S)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('x') PORT_CHAR('X') PORT_CODE(KEYCODE_X)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK)) PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE

	PORT_START("KEY2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('3') PORT_CHAR('#') PORT_CODE(KEYCODE_3)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('w') PORT_CHAR('W') PORT_CODE(KEYCODE_W)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(':') PORT_CHAR('*') PORT_CODE(KEYCODE_MINUS)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('p') PORT_CHAR('P') PORT_CODE(KEYCODE_P)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(';') PORT_CHAR('+') PORT_CODE(KEYCODE_COLON)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('d') PORT_CHAR('D') PORT_CODE(KEYCODE_D)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('c') PORT_CHAR('C') PORT_CODE(KEYCODE_C)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(LCONTROL)) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_LCONTROL)

	PORT_START("KEY3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('4') PORT_CHAR('$') PORT_CODE(KEYCODE_4)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('e') PORT_CHAR('E') PORT_CODE(KEYCODE_E)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('-') PORT_CHAR('=') PORT_CODE(KEYCODE_EQUALS)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x0a) PORT_NAME("Line Feed") PORT_CODE(KEYCODE_RALT) // actually between P and Return key
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('@') PORT_CHAR('`') PORT_CODE(KEYCODE_QUOTE)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('f') PORT_CHAR('F') PORT_CODE(KEYCODE_F)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('v') PORT_CHAR('V') PORT_CODE(KEYCODE_V)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<0>)

	PORT_START("KEY4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('5') PORT_CHAR('%') PORT_CODE(KEYCODE_5)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('r') PORT_CHAR('R') PORT_CODE(KEYCODE_R)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('^') PORT_CHAR('~') PORT_CODE(KEYCODE_TILDE) // actually between - and Home/Clear keys
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x0d) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('[') PORT_CHAR('{') PORT_CODE(KEYCODE_OPENBRACE) // actually to right of @ `
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('g') PORT_CHAR('G') PORT_CODE(KEYCODE_G)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('b') PORT_CHAR('B') PORT_CODE(KEYCODE_B)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<1>)

	PORT_START("KEY5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('6') PORT_CHAR('&') PORT_CODE(KEYCODE_6)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('t') PORT_CHAR('T') PORT_CODE(KEYCODE_T)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(HOME)) PORT_CHAR(UCHAR_MAMEKEY(END)) PORT_NAME("Home  Clear") PORT_CODE(KEYCODE_HOME)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('_') PORT_CHAR(UCHAR_MAMEKEY(DEL)) PORT_CODE(KEYCODE_BACKSPACE) // actually to right of Return key
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(']') PORT_CHAR('}') PORT_CODE(KEYCODE_CLOSEBRACE)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('h') PORT_CHAR('H') PORT_CODE(KEYCODE_H)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('n') PORT_CHAR('N') PORT_CODE(KEYCODE_N)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<2>)

	PORT_START("KEY6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('7') PORT_CHAR('\'') PORT_CODE(KEYCODE_7)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('y') PORT_CHAR('Y') PORT_CODE(KEYCODE_Y)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(' ') PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('/') PORT_CHAR('?') PORT_CODE(KEYCODE_SLASH)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('\\') PORT_CHAR('|') PORT_CODE(KEYCODE_BACKSLASH)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('j') PORT_CHAR('J') PORT_CODE(KEYCODE_J)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('m') PORT_CHAR('M') PORT_CODE(KEYCODE_M)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<3>)

	PORT_START("KEY7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('8') PORT_CHAR('(') PORT_CODE(KEYCODE_8)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('u') PORT_CHAR('U') PORT_CODE(KEYCODE_U)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_RCONTROL)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('.') PORT_CHAR('>') PORT_CODE(KEYCODE_STOP)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(',') PORT_CHAR('<') PORT_CODE(KEYCODE_COMMA)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<4>)

	PORT_START("KEY8")
	PORT_BIT(0x7f, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<5>)

	PORT_START("KEY9")
	PORT_BIT(0x7f, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<6>)

	PORT_START("OPTION")
	PORT_DIPNAME(0x01, 0x01, DEF_STR(Unused)) PORT_DIPLOCATION("SW:1")
	PORT_DIPSETTING(0x01, DEF_STR(Off))
	PORT_DIPSETTING(0x00, DEF_STR(On))
	PORT_DIPNAME(0x02, 0x00, "Conversation Mode") PORT_DIPLOCATION("SW:2")
	PORT_DIPSETTING(0x02, "Half Duplex")
	PORT_DIPSETTING(0x00, "Full Duplex")
	PORT_DIPNAME(0x04, 0x04, "Stop Bits") PORT_DIPLOCATION("SW:3")
	PORT_DIPSETTING(0x04, "1")
	PORT_DIPSETTING(0x00, "2")
	PORT_DIPNAME(0x18, 0x18, "Parity") PORT_DIPLOCATION("SW:4,5")
	PORT_DIPSETTING(0x00, "Even")
	PORT_DIPSETTING(0x08, "Odd")
	PORT_DIPSETTING(0x10, "Mark")
	PORT_DIPSETTING(0x18, "Space")
	PORT_DIPNAME(0xe0, 0xc0, "Baud Rate") PORT_DIPLOCATION("SW:6,7,8")
	PORT_DIPSETTING(0x00, "109.92")
	PORT_DIPSETTING(0x20, "300")
	PORT_DIPSETTING(0x40, "600")
	PORT_DIPSETTING(0x60, "1200")
	PORT_DIPSETTING(0x80, "2400")
	PORT_DIPSETTING(0xa0, "4800")
	PORT_DIPSETTING(0xc0, "9600")
	PORT_DIPSETTING(0xe0, "19200")

	PORT_START("SPECIAL")
	PORT_BIT(0x3f, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, ac_r)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_CUSTOM) PORT_READ_LINE_DEVICE_MEMBER(DEVICE_SELF, ktm3_state, sw_r<7>)

	PORT_START("JUMPER")
	PORT_DIPNAME(0x01, 0x00, "Columns") PORT_DIPLOCATION("J1:1")
	PORT_DIPSETTING(0x01, "40")
	PORT_DIPSETTING(0x00, "80")
INPUT_PORTS_END

void ktm3_state::ktm3(machine_config &config)
{
	M6502(config, m_pcpu, 14.745_MHz_XTAL / 15); // SY6502 at U2; divider not verified
	m_pcpu->set_addrmap(AS_PROGRAM, &ktm3_state::pcpu_map);

	M6502(config, m_vcpu, 14.745_MHz_XTAL / 15); // SY6502 at U1; divider not verified
	m_vcpu->set_addrmap(AS_PROGRAM, &ktm3_state::vcpu_map);

	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_raw(14.745_MHz_XTAL, 930, 0, 600, 262, 0, 240); // parameters guessed
	screen.set_screen_update(FUNC(ktm3_state::screen_update));

	MOS6551(config, m_acia, 14.745_MHz_XTAL / 15); // SY6551
	m_acia->set_xtal(14.745_MHz_XTAL / 8);
	m_acia->irq_handler().set_inputline(m_pcpu, m6502_device::IRQ_LINE);
	m_acia->txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));
	m_acia->rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
	m_acia->dtr_handler().set("rs232", FUNC(rs232_port_device::write_dtr));

	rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, "loopback"));
	rs232.rxd_handler().set(m_acia, FUNC(mos6551_device::write_rxd));
	rs232.cts_handler().set(m_acia, FUNC(mos6551_device::write_dsr));
	rs232.dcd_handler().set(m_acia, FUNC(mos6551_device::write_dcd));

	CLOCK(config, "60hz", 60).signal_handler().set(FUNC(ktm3_state::signal_w));
}

ROM_START(ktm3)
	ROM_REGION(0x800, "program", 0)
	ROM_LOAD("02-9001-126.bin", 0x000, 0x800, CRC(d7441e28) SHA1(bf0c05bfdcfd9083183325336d9702c67b7de63c))

	ROM_REGION(0x800, "chargen", 0)
	ROM_LOAD("02-0061-a.bin", 0x000, 0x800, CRC(9739e2ac) SHA1(672059b7618afb6c19632663d58a854ea9ec2401))
ROM_END

COMP(1980, ktm3, 0, 0, ktm3, ktm3, ktm3_state, empty_init, "Synertek Systems", "KTM-3", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW)