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

CZK-80

2010-08-30 Skeleton driver
2010-11-27 Connected to a terminal
2014-01-08 Added devices

Only known info: http://forum.z80.de/showtopic.php?threadid=280

On main board there are Z80A CPU, Z80A PIO, Z80A DART and Z80A CTC
   there is 8K ROM and XTAL 16MHz
   Two undumped proms, AM27S20DC and D3631-1.
FDC board contains Z80A DMA and NEC 765A (XTAL on it is 8MHZ)
Mega board contains 74LS612 and memory chips (32x 41256)

Status:
  It prints 2 lines of text, then:
  - If fdc is enabled in address map, it hangs waiting for a fdc response.
  - Otherwise, it displays an error, and you can press a key to try again.

ToDo:
- Everything... no diagram or manuals, so EVERYTHING below is guesswork.
- Need software

I/O ports: These ranges are what is guessed
  40 : rom switching
  4c-4F : PIO
  50-53 : DART
  54-57 : CTC
  80-81 : Parallel port (no programming bytes are sent, so it isn't a device)
  C0-C1 : FDC
  It is not known what address is used by:
  - the DMA
  - the Motor-on signal(s)
  as there are no unknown writes.


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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/upd765.h"
#include "cpu/z80/z80daisy.h"
#include "machine/z80pio.h"
#include "machine/z80dart.h"
#include "machine/z80ctc.h"
#include "machine/terminal.h"

#define TERMINAL_TAG "terminal"

class czk80_state : public driver_device
{
public:
	czk80_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_terminal(*this, "terminal")
		, m_fdc(*this, "fdc")
	{ }

	DECLARE_DRIVER_INIT(czk80);
	DECLARE_MACHINE_RESET(czk80);
	TIMER_CALLBACK_MEMBER(czk80_reset);
	DECLARE_READ8_MEMBER(port80_r);
	DECLARE_READ8_MEMBER(port81_r);
	DECLARE_READ8_MEMBER(portc0_r);
	DECLARE_WRITE8_MEMBER(port40_w);
	void kbd_put(u8 data);
	DECLARE_WRITE_LINE_MEMBER(ctc_z0_w);
	DECLARE_WRITE_LINE_MEMBER(ctc_z1_w);
	DECLARE_WRITE_LINE_MEMBER(ctc_z2_w);
	void czk80(machine_config &config);
	void czk80_io(address_map &map);
	void czk80_mem(address_map &map);
private:
	uint8_t m_term_data;
	required_device<cpu_device> m_maincpu;
	required_device<generic_terminal_device> m_terminal;
	required_device<upd765a_device> m_fdc;
};


WRITE8_MEMBER( czk80_state::port40_w )
{
	membank("bankr1")->set_entry(BIT(data, 1));
}

READ8_MEMBER( czk80_state::port80_r )
{
	uint8_t ret = m_term_data;
	m_term_data = 0;
	return ret;
}

READ8_MEMBER( czk80_state::portc0_r )
{
	return 0x80;
}

READ8_MEMBER( czk80_state::port81_r )
{
	return (m_term_data) ? 3 : 1;
}

void czk80_state::czk80_mem(address_map &map)
{
	map(0x0000, 0x1fff).bankr("bankr0").bankw("bankw0");
	map(0x2000, 0xdfff).ram();
	map(0xe000, 0xffff).bankr("bankr1").bankw("bankw1");
}

void czk80_state::czk80_io(address_map &map)
{
	map.global_mask(0xff);
	map(0x40, 0x40).w(this, FUNC(czk80_state::port40_w));
	map(0x4c, 0x4f).rw("pio", FUNC(z80pio_device::read), FUNC(z80pio_device::write));
	map(0x50, 0x53).rw("dart", FUNC(z80dart_device::cd_ba_r), FUNC(z80dart_device::cd_ba_w));
	map(0x54, 0x57).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
	map(0x80, 0x80).r(this, FUNC(czk80_state::port80_r)).w(m_terminal, FUNC(generic_terminal_device::write));
	map(0x81, 0x81).r(this, FUNC(czk80_state::port81_r));
	/* Select one of the below */
	//AM_RANGE(0xc0, 0xc0) AM_READ(portc0_r)
	map(0xc0, 0xc1).m(m_fdc, FUNC(upd765a_device::map));
}

/* Input ports */
static INPUT_PORTS_START( czk80 )
INPUT_PORTS_END

/* Z80 Daisy Chain */

static const z80_daisy_config daisy_chain[] =
{
	{ "pio" },
	{ "dart" },
	{ "ctc" },
	{ nullptr }
};

/* Z80-CTC Interface */

WRITE_LINE_MEMBER( czk80_state::ctc_z0_w )
{
// guess this generates clock for z80dart
}

WRITE_LINE_MEMBER( czk80_state::ctc_z1_w )
{
}

WRITE_LINE_MEMBER( czk80_state::ctc_z2_w )
{
}

/* after the first 4 bytes have been read from ROM, switch the ram back in */
TIMER_CALLBACK_MEMBER( czk80_state::czk80_reset)
{
	membank("bankr0")->set_entry(1);
}

MACHINE_RESET_MEMBER( czk80_state, czk80 )
{
	machine().scheduler().timer_set(attotime::from_usec(3), timer_expired_delegate(FUNC(czk80_state::czk80_reset),this));
	membank("bankr0")->set_entry(0); // point at rom
	membank("bankw0")->set_entry(0); // always write to ram
	membank("bankr1")->set_entry(0); // point at rom
	membank("bankw1")->set_entry(0); // always write to ram
}

DRIVER_INIT_MEMBER( czk80_state, czk80 )
{
	uint8_t *main = memregion("maincpu")->base();

	membank("bankr0")->configure_entry(1, &main[0x0000]);
	membank("bankr0")->configure_entry(0, &main[0x10000]);
	membank("bankw0")->configure_entry(0, &main[0x0000]);

	membank("bankr1")->configure_entry(1, &main[0xe000]);
	membank("bankr1")->configure_entry(0, &main[0x10000]);
	membank("bankw1")->configure_entry(0, &main[0xe000]);
}

static void czk80_floppies(device_slot_interface &device)
{
	device.option_add("525dd", FLOPPY_525_DD);
}

void czk80_state::kbd_put(u8 data)
{
	m_term_data = data;
}

MACHINE_CONFIG_START(czk80_state::czk80)
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL(16'000'000) / 4)
	MCFG_CPU_PROGRAM_MAP(czk80_mem)
	MCFG_CPU_IO_MAP(czk80_io)
	MCFG_Z80_DAISY_CHAIN(daisy_chain)
	MCFG_MACHINE_RESET_OVERRIDE(czk80_state, czk80)

	MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
	MCFG_GENERIC_TERMINAL_KEYBOARD_CB(PUT(czk80_state, kbd_put))
	MCFG_UPD765A_ADD("fdc", false, true)
	MCFG_FLOPPY_DRIVE_ADD("fdc:0", czk80_floppies, "525dd", floppy_image_device::default_floppy_formats)

	MCFG_DEVICE_ADD("ctc", Z80CTC, XTAL(16'000'000) / 4)
	MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(czk80_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(czk80_state, ctc_z1_w))
	MCFG_Z80CTC_ZC2_CB(WRITELINE(czk80_state, ctc_z2_w))

	MCFG_DEVICE_ADD("dart", Z80DART, XTAL(16'000'000) / 4)
	//MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE("rs232", rs232_port_device, write_txd))
	//MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE("rs232", rs232_port_device, write_dtr))
	//MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE("rs232", rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))

	MCFG_DEVICE_ADD("pio", Z80PIO, XTAL(16'000'000)/4)
	MCFG_Z80PIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
MACHINE_CONFIG_END


/* ROM definition */
ROM_START( czk80 )
	ROM_REGION( 0x12000, "maincpu", 0 )
	ROM_LOAD( "czk80.rom", 0x10000, 0x2000, CRC(7081b7c6) SHA1(13f75b14ea73b252bdfa2384e6eead6e720e49e3))
ROM_END

/* Driver */

//    YEAR  NAME    PARENT   COMPAT MACHINE  INPUT  CLASS        INIT   COMPANY       FULLNAME  FLAGS
COMP( 198?, czk80,  0,       0,     czk80,   czk80, czk80_state, czk80, "<unknown>",  "CZK-80", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )