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path: root/src/mame/drivers/epic14e.cpp
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// license:BSD-3-Clause
// copyright-holders:AJR
/***************************************************************************

    Skeleton driver for Epic 14E video display terminal.

    This green-screen terminal emulates the TeleVideo 925. It was later
    acquired by ADDS and rereleased as the Viewpoint/925+.

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

#include "emu.h"
//#include "bus/rs232/rs232.h"
#include "cpu/m6502/m6502.h"
#include "cpu/mcs48/mcs48.h"
#include "machine/input_merger.h"
#include "machine/6522via.h"
#include "machine/mos6551.h"
#include "video/scn2674.h"
#include "screen.h"

class epic14e_state : public driver_device
{
public:
	epic14e_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_via(*this, "via")
		, m_charram(*this, "charram")
		, m_attrram(*this, "attrram")
		, m_chargen(*this, "chargen")
		, m_dsw(*this, "DSW%u", 1U)
	{
	}

	void epic14e(machine_config &config);

private:
	SCN2672_DRAW_CHARACTER_MEMBER(draw_character);

	u8 vram_r(offs_t offset);
	void vram_w(offs_t offset, u8 data);

	void cpu_map(address_map &map);
	void char_map(address_map &map);
	void attr_map(address_map &map);

	required_device<m6502_device> m_maincpu;
	required_device<via6522_device> m_via;
	required_shared_ptr<u8> m_charram;
	required_shared_ptr<u8> m_attrram;
	required_region_ptr<u8> m_chargen;
	required_ioport_array<3> m_dsw;
};


SCN2672_DRAW_CHARACTER_MEMBER(epic14e_state::draw_character)
{
	const u8 chardata = m_chargen[charcode << 4 | linecount];
	u16 dots = ((chardata & 0x7f) << 2) | (BIT(chardata, 7) ? 3 : 0);

	for (int i = 0; i < 9; i++)
	{
		bitmap.pix32(y, x++) = BIT(dots, 8) ? rgb_t::white() : rgb_t::black();
		dots <<= 1;
	}
}


u8 epic14e_state::vram_r(offs_t offset)
{
	return (BIT(offset, 0) ? m_charram : m_attrram)[offset >> 1];
}

void epic14e_state::vram_w(offs_t offset, u8 data)
{
	(BIT(offset, 0) ? m_charram : m_attrram)[offset >> 1] = data;
}

void epic14e_state::cpu_map(address_map &map)
{
	map(0x0000, 0x07ff).ram();
	map(0x2000, 0x3fff).rw(FUNC(epic14e_state::vram_r), FUNC(epic14e_state::vram_w));
	map(0x6000, 0x6007).rw("pvtc", FUNC(scn2672_device::read), FUNC(scn2672_device::write));
	map(0x8000, 0x8003).rw("acia1", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
	map(0x9000, 0x9003).rw("acia2", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
	map(0xa010, 0xa01f).m(m_via, FUNC(via6522_device::map));
	map(0xe000, 0xffff).rom().region("program", 0);
}

void epic14e_state::char_map(address_map &map)
{
	map(0x0000, 0x0fff).ram().share("charram");
}

void epic14e_state::attr_map(address_map &map)
{
	map(0x0000, 0x0fff).ram().share("attrram");
}


static INPUT_PORTS_START(epic14e)
	PORT_START("DSW1")
	PORT_DIPNAME(0x001, 0x001, "Modem Stop Bits") PORT_DIPLOCATION("SW1:1")
	PORT_DIPSETTING(0x001, "1")
	PORT_DIPSETTING(0x000, "2")
	PORT_DIPNAME(0x002, 0x002, "Modem Data Bits") PORT_DIPLOCATION("SW1:2")
	PORT_DIPSETTING(0x000, "7")
	PORT_DIPSETTING(0x002, "8")
	PORT_DIPNAME(0x004, 0x004, "Modem Protocol") PORT_DIPLOCATION("SW1:3")
	PORT_DIPSETTING(0x004, "X-ON/X-OFF")
	PORT_DIPSETTING(0x000, "CTS")
	PORT_DIPNAME(0x078, 0x040, "Modem Baud Rate") PORT_DIPLOCATION("SW1:4,5,6,7")
	PORT_DIPSETTING(0x038, "50")
	PORT_DIPSETTING(0x058, "75")
	PORT_DIPSETTING(0x018, "110")
	PORT_DIPSETTING(0x068, "135")
	PORT_DIPSETTING(0x028, "150")
	PORT_DIPSETTING(0x048, "300")
	PORT_DIPSETTING(0x008, "600")
	PORT_DIPSETTING(0x070, "1200")
	PORT_DIPSETTING(0x030, "1800")
	PORT_DIPSETTING(0x050, "2400")
	PORT_DIPSETTING(0x010, "3600")
	PORT_DIPSETTING(0x060, "4800")
	PORT_DIPSETTING(0x020, "7200")
	PORT_DIPSETTING(0x040, "9600")
	PORT_DIPSETTING(0x000, "19200")
	PORT_DIPNAME(0x380, 0x380, "Modem Parity") PORT_DIPLOCATION("SW1:8,9,10")
	PORT_DIPSETTING(0x380, "Disable")
	PORT_DIPSETTING(0x180, "Odd")
	PORT_DIPSETTING(0x080, "Even")
	PORT_DIPSETTING(0x100, "Mark")
	PORT_DIPSETTING(0x000, "Space")

	PORT_START("DSW2")
	PORT_DIPNAME(0x001, 0x001, "Auxiliary Stop Bits") PORT_DIPLOCATION("SW2:1")
	PORT_DIPSETTING(0x001, "1")
	PORT_DIPSETTING(0x000, "2")
	PORT_DIPNAME(0x002, 0x002, "Auxiliary Data Bits") PORT_DIPLOCATION("SW2:2")
	PORT_DIPSETTING(0x000, "7")
	PORT_DIPSETTING(0x002, "8")
	PORT_DIPNAME(0x004, 0x004, "Auxiliary Protocol") PORT_DIPLOCATION("SW2:3")
	PORT_DIPSETTING(0x004, "X-ON/X-OFF")
	PORT_DIPSETTING(0x000, "DTR")
	PORT_DIPNAME(0x078, 0x040, "Auxiliary Baud Rate") PORT_DIPLOCATION("SW1:4,5,6,7")
	PORT_DIPSETTING(0x038, "50")
	PORT_DIPSETTING(0x058, "75")
	PORT_DIPSETTING(0x018, "110")
	PORT_DIPSETTING(0x068, "135")
	PORT_DIPSETTING(0x028, "150")
	PORT_DIPSETTING(0x048, "300")
	PORT_DIPSETTING(0x008, "600")
	PORT_DIPSETTING(0x070, "1200")
	PORT_DIPSETTING(0x030, "1800")
	PORT_DIPSETTING(0x050, "2400")
	PORT_DIPSETTING(0x010, "3600")
	PORT_DIPSETTING(0x060, "4800")
	PORT_DIPSETTING(0x020, "7200")
	PORT_DIPSETTING(0x040, "9600")
	PORT_DIPSETTING(0x000, "19200")
	PORT_DIPNAME(0x380, 0x380, "Auxiliary Parity") PORT_DIPLOCATION("SW2:8,9,10")
	PORT_DIPSETTING(0x380, "Disable")
	PORT_DIPSETTING(0x180, "Odd")
	PORT_DIPSETTING(0x080, "Even")
	PORT_DIPSETTING(0x100, "Mark")
	PORT_DIPSETTING(0x000, "Space")

	PORT_START("DSW3")
	PORT_DIPNAME(0x003, 0x003, "Communications Mode") PORT_DIPLOCATION("SW3:1,2")
	PORT_DIPSETTING(0x003, "Full Duplex")
	PORT_DIPSETTING(0x001, "Half Duplex")
	PORT_DIPSETTING(0x002, "Block")
	PORT_DIPSETTING(0x000, "Local")
	PORT_DIPNAME(0x004, 0x004, "Screen Mode") PORT_DIPLOCATION("SW3:3")
	PORT_DIPSETTING(0x004, "Green on Black")
	PORT_DIPSETTING(0x000, "Black on Green")
	PORT_DIPNAME(0x008, 0x008, "Key Click") PORT_DIPLOCATION("SW3:4")
	PORT_DIPSETTING(0x008, DEF_STR(Off))
	PORT_DIPSETTING(0x000, DEF_STR(On))
	PORT_DIPNAME(0x010, 0x010, "Screen Refresh") PORT_DIPLOCATION("SW3:5")
	PORT_DIPSETTING(0x000, "50 Hz")
	PORT_DIPSETTING(0x010, "60 Hz")
	PORT_DIPNAME(0x020, 0x020, "Terminal Emulation") PORT_DIPLOCATION("SW3:6")
	PORT_DIPSETTING(0x020, "Epic 14E")
	PORT_DIPSETTING(0x000, "Other")
	PORT_DIPNAME(0x040, 0x040, "Page/Line Attributes") PORT_DIPLOCATION("SW3:7")
	PORT_DIPSETTING(0x040, "Page")
	PORT_DIPSETTING(0x000, "Line")
	PORT_DIPNAME(0x080, 0x080, "Edit Keys") PORT_DIPLOCATION("SW3:8")
	PORT_DIPSETTING(0x080, "Transmitted")
	PORT_DIPSETTING(0x000, "Local")
	PORT_DIPNAME(0x100, 0x100, "Return Key") PORT_DIPLOCATION("SW3:9")
	PORT_DIPSETTING(0x100, "CR")
	PORT_DIPSETTING(0x000, "CR/LF")
	PORT_DIPNAME(0x200, 0x200, "CRT Saver") PORT_DIPLOCATION("SW3:10")
	PORT_DIPSETTING(0x200, DEF_STR(Off))
	PORT_DIPSETTING(0x000, DEF_STR(On))
INPUT_PORTS_END


void epic14e_state::epic14e(machine_config &config)
{
	M6502(config, m_maincpu, 17.01_MHz_XTAL / 9); // SY6502A (1.89 MHz confirmed)
	m_maincpu->set_addrmap(AS_PROGRAM, &epic14e_state::cpu_map);

	INPUT_MERGER_ANY_HIGH(config, "mainirq").output_handler().set_inputline(m_maincpu, m6502_device::IRQ_LINE);

	VIA6522(config, m_via, 17.01_MHz_XTAL / 9); // SY6522A
	m_via->irq_handler().set("mainirq", FUNC(input_merger_device::in_w<0>));

	I8748(config, "keybmcu", 4608000).set_disable();

	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_color(rgb_t::green());
	screen.set_raw(17.01_MHz_XTAL, 900, 0, 720, 315, 0, 300);
	screen.set_screen_update("pvtc", FUNC(scn2672_device::screen_update));

	scn2672_device &pvtc(SCN2672(config, "pvtc", 17.01_MHz_XTAL / 9));
	pvtc.intr_callback().set_inputline(m_maincpu, m6502_device::NMI_LINE);
	pvtc.set_character_width(9);
	pvtc.set_display_callback(FUNC(epic14e_state::draw_character));
	pvtc.set_addrmap(0, &epic14e_state::char_map);
	pvtc.set_addrmap(1, &epic14e_state::attr_map);
	pvtc.set_screen("screen");
	// TODO: Serial keyboard clocked at 60 Hz frame rate

	mos6551_device &acia1(MOS6551(config, "acia1", 17.01_MHz_XTAL / 9)); // SY6551A
	acia1.set_xtal(1.8432_MHz_XTAL);
	acia1.irq_handler().set("mainirq", FUNC(input_merger_device::in_w<1>));

	mos6551_device &acia2(MOS6551(config, "acia2", 17.01_MHz_XTAL / 9)); // SY6551A
	acia2.set_xtal(1.8432_MHz_XTAL); // each ACIA has its own XTAL
	acia2.irq_handler().set("mainirq", FUNC(input_merger_device::in_w<2>));

	//RS232_PORT(config, "modem", default_rs232_devices, nullptr);
	//RS232_PORT(config, "aux", default_rs232_devices, nullptr);
}


ROM_START(epic14e)
	ROM_REGION(0x2000, "program", 0)
	ROM_LOAD("u6.bin",  0x0000, 0x1000, CRC(014b5da0) SHA1(190c2d48c6928d143458ba094f785d40ac29f2c0))
	ROM_LOAD("u13.bin", 0x1000, 0x1000, CRC(2b406a88) SHA1(e619cc020ab5eabad99967b27cb969ceb191f5ee))

	ROM_REGION(0x1000, "chargen", 0)
	ROM_LOAD("u24.bin", 0x0000, 0x1000, CRC(da409f03) SHA1(5a90a6b865dad20dc3f455448670b4f5baa55028))

	ROM_REGION(0x0400, "keybmcu", 0)
	ROM_LOAD("246.bin", 0x0000, 0x0400, NO_DUMP)
ROM_END


COMP(1982, epic14e, 0, 0, epic14e, epic14e, epic14e_state, empty_init, "Epic Computer Products", "Epic 14E (v1.0)", MACHINE_IS_SKELETON)