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

Skeleton driver for TeleVideo 965 video display terminal.

TeleVideo 9320 appears to run on similar hardware with a 2681 DUART replacing the ACIAs.

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

#include "emu.h"
//#include "bus/rs232/rs232.h"
#include "cpu/g65816/g65816.h"
#include "machine/mos6551.h"
#include "machine/nvram.h"
#include "video/scn2674.h"
#include "screen.h"

class tv965_state : public driver_device
{
public:
	tv965_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_screen(*this, "screen")
	{ }

	void tv965(machine_config &config);
private:
	SCN2672_DRAW_CHARACTER_MEMBER(draw_character);

	u8 ga_hack_r();

	void mem_map(address_map &map);
	void program_map(address_map &map);

	required_device<cpu_device> m_maincpu;
	required_device<screen_device> m_screen;
};

SCN2672_DRAW_CHARACTER_MEMBER(tv965_state::draw_character)
{
}

u8 tv965_state::ga_hack_r()
{
	return 0x08;
}

void tv965_state::mem_map(address_map &map)
{
	map(0x00000, 0x01fff).ram().share("nvram");
	map(0x02000, 0x02007).rw("crtc", FUNC(scn2672_device::read), FUNC(scn2672_device::write));
	map(0x04000, 0x04000).r(FUNC(tv965_state::ga_hack_r));
	map(0x06200, 0x06203).rw("acia1", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
	map(0x06400, 0x06403).rw("acia2", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
	map(0x08000, 0x09fff).ram().mirror(0x2000).share("charram");
	map(0x0c000, 0x0dfff).ram().mirror(0x2000).share("attrram");
	map(0x10000, 0x1ffff).rom().region("eprom1", 0);
	map(0x30000, 0x3ffff).rom().region("eprom2", 0);
}

void tv965_state::program_map(address_map &map)
{
	map.global_mask(0x2ffff);
	map(0x00000, 0x0ffff).rom().region("eprom1", 0);
	map(0x20000, 0x2ffff).rom().region("eprom2", 0);
}

static INPUT_PORTS_START( tv965 )
INPUT_PORTS_END

void tv965_state::tv965(machine_config &config)
{
	G65816(config, m_maincpu, 44.4528_MHz_XTAL / 10);
	m_maincpu->set_addrmap(AS_DATA, &tv965_state::mem_map);
	m_maincpu->set_addrmap(AS_PROGRAM, &tv965_state::program_map);

	NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0); // CXK5864BP-10L + battery

	SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
	m_screen->set_raw(26.9892_MHz_XTAL, 1020, 0, 800, 441, 0, 416);
	//m_screen->set_raw(44.4528_MHz_XTAL, 1680, 0, 1320, 441, 0, 416);
	m_screen->set_screen_update("crtc", FUNC(scn2672_device::screen_update));

	scn2672_device &crtc(SCN2672(config, "crtc", 26.9892_MHz_XTAL / 10));
	crtc.set_character_width(10);
	crtc.set_display_callback(FUNC(tv965_state::draw_character));
	crtc.intr_callback().set_inputline(m_maincpu, G65816_LINE_NMI);
	crtc.set_screen("screen");

	mos6551_device &acia1(MOS6551(config, "acia1", 0));
	acia1.set_xtal(3.6864_MHz_XTAL / 2); // divider not verified, possibly even programmable

	mos6551_device &acia2(MOS6551(config, "acia2", 0));
	acia2.set_xtal(3.6864_MHz_XTAL / 2); // divider not verified, possibly even programmable
}

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

Televideo TVI-965 (P/N 132970-00)
Chips: G65SC816P-5, SCN2672TC5N40, Silicon Logic 271582-00, 2x UM6551A, Beeper, 2x MK48H64LN-70, HY6264LP-10 (next to gate array), CXK5864BP-10L, DS1231, round battery
Crystals: 44.4528, 26.9892, 3.6864

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

ROM_START( tv965 )
	ROM_REGION(0x10000, "eprom1", 0)
	ROM_LOAD( "180003-30h.u8", 0x00000, 0x10000, CRC(c7b9ca39) SHA1(1d95a8b0a4ea5caf3fb628c44c7a3567700a0b59) )

	ROM_REGION(0x10000, "eprom2", ROMREGION_ERASE00)
	ROM_LOAD( "180003-38h.u9", 0x00000, 0x08000, CRC(30fae408) SHA1(f05bb2a9ce2df60b046733f746d8d8a1eb3ac8bc) )
ROM_END

COMP( 1989, tv965, 0, 0, tv965, tv965, tv965_state, empty_init, "TeleVideo Systems", "TeleVideo 965", MACHINE_IS_SKELETON )