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// license:MAME
// copyright-holders:Robbbert
/************************************************************************************************************

Telcon Zorba

2013-08-25 Skeleton

This was one of the last CP/M-based systems, already out of date when it was released.
Because it doesn't use the standard Z80 peripherals, it uses a homebrew interrupt controller to make use
 of the Z80's IM2.

The keyboard is an intelligent serial device like the Kaypro's keyboard. They even have the same plug,
and might be swappable. Need a schematic.

ToDo:
- Add interrupt vector hardware and masking feature
- Connect devices to the above hardware
- Fix the display
- Fix floppy-disk
- Connect up the PIT
- Replace the ascii keyboard with the real one, if possible
- Probably lots of other things


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


#include "emu.h"
#include "cpu/z80/z80.h"
#include "cpu/m6805/m6805.h"
#include "machine/i8251.h"
#include "machine/6821pia.h"
#include "machine/z80dma.h"
#include "machine/pit8253.h"
#include "video/i8275.h"
#include "sound/beep.h"
#include "machine/keyboard.h"
#include "machine/wd_fdc.h"

#define KEYBOARD_TAG "keyboard"

class zorba_state : public driver_device
{
public:
	zorba_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_palette(*this, "palette")
		, m_maincpu(*this, "maincpu")
		, m_beep(*this, "beeper")
		, m_dma(*this, "dma")
		, m_u0(*this, "uart0")
		, m_u1(*this, "uart1")
		, m_u2(*this, "uart2")
		, m_pia0(*this, "pia0")
		, m_pia1(*this, "pia1")
		, m_crtc(*this, "crtc")
		, m_fdc (*this, "fdc")
		, m_floppy0(*this, "fdc:0")
		, m_floppy1(*this, "fdc:1")
	{}

public:
	const UINT8 *m_p_chargen;
	DECLARE_DRIVER_INIT(zorba);
	DECLARE_MACHINE_RESET(zorba);
	DECLARE_READ8_MEMBER(ram_r);
	DECLARE_WRITE8_MEMBER(ram_w);
	DECLARE_READ8_MEMBER(rom_r);
	DECLARE_WRITE8_MEMBER(rom_w);
	DECLARE_WRITE8_MEMBER(intmask_w);
	DECLARE_WRITE_LINE_MEMBER(busreq_w);
	DECLARE_READ8_MEMBER(memory_read_byte);
	DECLARE_WRITE8_MEMBER(memory_write_byte);
	DECLARE_READ8_MEMBER(io_read_byte);
	DECLARE_WRITE8_MEMBER(io_write_byte);
	DECLARE_WRITE8_MEMBER(pia0_porta_w);
	DECLARE_WRITE8_MEMBER(kbd_put);
	DECLARE_READ8_MEMBER(keyboard_r);
	I8275_DRAW_CHARACTER_MEMBER( zorba_update_chr );
	required_device<palette_device> m_palette;

private:
	UINT8 m_term_data;
	required_device<cpu_device> m_maincpu;
	required_device<beep_device> m_beep;
	required_device<z80dma_device> m_dma;
	required_device<i8251_device> m_u0;
	required_device<i8251_device> m_u1;
	required_device<i8251_device> m_u2;
	required_device<pia6821_device> m_pia0;
	required_device<pia6821_device> m_pia1;
	required_device<i8275_device> m_crtc;
	required_device<fd1793_t> m_fdc;
	required_device<floppy_connector> m_floppy0;
	required_device<floppy_connector> m_floppy1;
};

static ADDRESS_MAP_START( zorba_mem, AS_PROGRAM, 8, zorba_state )
	AM_RANGE( 0x0000, 0x3fff ) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0")
	AM_RANGE( 0x4000, 0xffff ) AM_RAM
ADDRESS_MAP_END

static ADDRESS_MAP_START( zorba_kbdmem, AS_PROGRAM, 8, zorba_state )
	ADDRESS_MAP_GLOBAL_MASK(0x7ff)
	AM_RANGE( 0x000, 0x07f ) AM_RAM // internal RAM
	AM_RANGE( 0x080, 0x7ff ) AM_ROM // internal EPROM
ADDRESS_MAP_END

static ADDRESS_MAP_START( zorba_io, AS_IO, 8, zorba_state )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x03) AM_DEVREADWRITE("pit", pit8254_device, read, write)
	AM_RANGE(0x04, 0x04) AM_READWRITE(rom_r,rom_w)
	AM_RANGE(0x05, 0x05) AM_READWRITE(ram_r,ram_w)
	AM_RANGE(0x10, 0x11) AM_DEVREADWRITE("crtc", i8275_device, read, write)
	AM_RANGE(0x20, 0x20) AM_DEVREADWRITE("uart0", i8251_device, data_r, data_w)
	AM_RANGE(0x21, 0x21) AM_DEVREADWRITE("uart0", i8251_device, status_r, control_w)
	AM_RANGE(0x22, 0x22) AM_DEVREADWRITE("uart1", i8251_device, data_r, data_w)
	AM_RANGE(0x23, 0x23) AM_DEVREADWRITE("uart1", i8251_device, status_r, control_w)
	//AM_RANGE(0x24, 0x24) AM_DEVREADWRITE("uart2", i8251_device, data_r, data_w)
	//AM_RANGE(0x25, 0x25) AM_DEVREADWRITE("uart2", i8251_device, status_r, control_w)
	AM_RANGE(0x24, 0x25) AM_READ(keyboard_r) AM_WRITENOP
	AM_RANGE(0x26, 0x26) AM_WRITE(intmask_w)
	AM_RANGE(0x30, 0x30) AM_DEVREADWRITE("dma", z80dma_device, read, write)
	AM_RANGE(0x40, 0x43) AM_DEVREADWRITE("fdc", fd1793_t, read, write)
	AM_RANGE(0x50, 0x53) AM_DEVREADWRITE("pia0", pia6821_device, read, write)
	AM_RANGE(0x60, 0x63) AM_DEVREADWRITE("pia1", pia6821_device, read, write)
ADDRESS_MAP_END

READ8_MEMBER( zorba_state::ram_r )
{
	membank("bankr0")->set_entry(0);
	return 0;
}

WRITE8_MEMBER( zorba_state::ram_w )
{
	membank("bankr0")->set_entry(0);
}

READ8_MEMBER( zorba_state::rom_r )
{
	membank("bankr0")->set_entry(1);
	return 0;
}

WRITE8_MEMBER( zorba_state::rom_w )
{
	membank("bankr0")->set_entry(1);
}

WRITE8_MEMBER( zorba_state::intmask_w )
{
}

static INPUT_PORTS_START( zorba )
INPUT_PORTS_END

DRIVER_INIT_MEMBER( zorba_state, zorba )
{
	UINT8 *main = memregion("maincpu")->base();

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

//-------------------------------------------------
//  Z80DMA
//-------------------------------------------------

WRITE_LINE_MEMBER( zorba_state::busreq_w )
{
// since our Z80 has no support for BUSACK, we assume it is granted immediately
	m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, state);
	m_maincpu->set_input_line(INPUT_LINE_HALT, state); // do we need this?
	m_dma->bai_w(state); // tell dma that bus has been granted
}

READ8_MEMBER(zorba_state::memory_read_byte)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM);
	return prog_space.read_byte(offset);
}

WRITE8_MEMBER(zorba_state::memory_write_byte)
{
	address_space& prog_space = m_maincpu->space(AS_PROGRAM);
	prog_space.write_byte(offset, data);
}

READ8_MEMBER(zorba_state::io_read_byte)
{
	address_space& prog_space = m_maincpu->space(AS_IO);
	return prog_space.read_byte(offset);
}

WRITE8_MEMBER(zorba_state::io_write_byte)
{
	address_space& prog_space = m_maincpu->space(AS_IO);

	if (offset == 0x10)
	{
		m_crtc->dack_w(space, 0, data);
	}
	else
	{
		prog_space.write_byte(offset, data);
	}
}


static SLOT_INTERFACE_START( zorba_floppies )
	SLOT_INTERFACE( "525dd", FLOPPY_525_DD )
SLOT_INTERFACE_END

WRITE8_MEMBER( zorba_state::pia0_porta_w )
{
	m_beep->set_state(BIT(data, 7));
	m_fdc->dden_w(BIT(data, 6));

	floppy_image_device *floppy = NULL;
	if (!BIT(data, 0)) floppy = m_floppy0->get_device();
	if (!BIT(data, 1)) floppy = m_floppy1->get_device();

	m_fdc->set_floppy(floppy);

	if (floppy)
	{
		floppy->ss_w(!BIT(data, 5)); // might need inverting
	}

	m_floppy0->get_device()->mon_w(BIT(data, 4));
	m_floppy1->get_device()->mon_w(BIT(data, 4));
}

I8275_DRAW_CHARACTER_MEMBER( zorba_state::zorba_update_chr )
{
	int i;
	const rgb_t *palette = m_palette->palette()->entry_list_raw();

	UINT8 gfx = m_p_chargen[(linecount & 15) + (charcode << 4) + ((gpa & 1) << 11)];

	if (vsp)
		gfx = 0;

	if (lten)
		gfx = 0xff;

	if (rvv)
		gfx ^= 0xff;

	for(i=0;i<8;i++)
		bitmap.pix32(y, x + 7 - i) = palette[BIT(gfx, i) ? (hlgt ? 2 : 1) : 0];
}


/* F4 Character Displayer */
static const gfx_layout u5_charlayout =
{
	8, 11,                   /* 8 x 11 characters */
	256,                  /* 256 characters */
	1,                  /* 1 bits per pixel */
	{ 0 },                  /* no bitplanes */
	/* x offsets */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	/* y offsets */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8 },
	8*16                    /* every char takes 16 bytes */
};

static GFXDECODE_START( zorba )
	GFXDECODE_ENTRY( "chargen", 0x0000, u5_charlayout, 0, 1 )
GFXDECODE_END

MACHINE_RESET_MEMBER( zorba_state, zorba )
{
	m_beep->set_frequency(800);
	m_p_chargen = memregion("chargen")->base();
	membank("bankr0")->set_entry(1); // point at rom
	membank("bankw0")->set_entry(0); // always write to ram
}

READ8_MEMBER( zorba_state::keyboard_r )
{
	if (offset)
		return (m_term_data) ? 0x87 : 0x85;

	UINT8 data = m_term_data;
	m_term_data = 0;
	return data;
}

WRITE8_MEMBER( zorba_state::kbd_put )
{
	m_term_data = data;
}

static MACHINE_CONFIG_START( zorba, zorba_state )
	// basic machine hardware
	MCFG_CPU_ADD("maincpu", Z80, XTAL_24MHz / 6)
	MCFG_CPU_PROGRAM_MAP(zorba_mem)
	MCFG_CPU_IO_MAP(zorba_io)
	MCFG_MACHINE_RESET_OVERRIDE(zorba_state, zorba)

	/* keyboard */
	MCFG_CPU_ADD("kbdcpu", M68705, XTAL_3_579545MHz) // MC68705P3S (0x80 bytes ram, 0x780 bytes of rom)
	MCFG_CPU_PROGRAM_MAP(zorba_kbdmem)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_UPDATE_DEVICE("crtc", i8275_device, screen_update)
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", zorba)
	MCFG_PALETTE_ADD_MONOCHROME_GREEN_HIGHLIGHT("palette")

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("beeper", BEEP, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)

	/* devices */
	MCFG_DEVICE_ADD("dma", Z80DMA, XTAL_24MHz/6)
	// busack on cpu connects to bai pin
	MCFG_Z80DMA_OUT_BUSREQ_CB(WRITELINE(zorba_state, busreq_w))	 //connects to busreq on cpu
	MCFG_Z80DMA_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))	// connects to IRQ0 on cpu
	//ba0 - not connected
	MCFG_Z80DMA_IN_MREQ_CB(READ8(zorba_state, memory_read_byte))
	MCFG_Z80DMA_OUT_MREQ_CB(WRITE8(zorba_state, memory_write_byte))
	MCFG_Z80DMA_IN_IORQ_CB(READ8(zorba_state, io_read_byte))
	MCFG_Z80DMA_OUT_IORQ_CB(WRITE8(zorba_state, io_write_byte))

	MCFG_DEVICE_ADD("uart0", I8251, 0)
	// COM port

	MCFG_DEVICE_ADD("uart1", I8251, 0)
	// printer port

	MCFG_DEVICE_ADD("uart2", I8251, 0)
	// keyboard

// port A - disk select etc, beeper
// port B - parallel interface
	MCFG_DEVICE_ADD("pia0", PIA6821, 0)
	MCFG_PIA_WRITEPA_HANDLER(WRITE8(zorba_state, pia0_porta_w))

// IEEE488 interface
	MCFG_DEVICE_ADD("pia1", PIA6821, 0)

	MCFG_DEVICE_ADD("pit", PIT8254, 0)
	MCFG_PIT8253_CLK0(XTAL_24MHz / 3) /* Timer 0: ? */
	MCFG_PIT8253_CLK1(XTAL_24MHz / 3) /* Timer 1: ? */
	MCFG_PIT8253_CLK2(XTAL_24MHz / 3) /* Timer 2: ? */

	MCFG_DEVICE_ADD("crtc", I8275, XTAL_14_31818MHz/7)
	MCFG_I8275_CHARACTER_WIDTH(8)
	MCFG_I8275_DRAW_CHARACTER_CALLBACK_OWNER(zorba_state, zorba_update_chr)
	MCFG_I8275_DRQ_CALLBACK(DEVWRITELINE("dma", z80dma_device, rdy_w))
	MCFG_I8275_IRQ_CALLBACK(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_FD1793x_ADD("fdc", XTAL_24MHz / 24)
	MCFG_FLOPPY_DRIVE_ADD("fdc:0", zorba_floppies, "525dd", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:1", zorba_floppies, "525dd", floppy_image_device::default_floppy_formats)

	/* Keyboard */
	MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0)
	MCFG_GENERIC_KEYBOARD_CB(WRITE8(zorba_state, kbd_put))
MACHINE_CONFIG_END

ROM_START( zorba )
	ROM_REGION( 0x14000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "780000.u47", 0x10000, 0x1000, CRC(6d58f2c5) SHA1(7763f08c801cd36e5a761c6dc9f30a50b3bc482d) )

	ROM_REGION( 0x800, "kbdcpu", 0 )
	ROM_LOAD( "8999-1 3-28-83", 0x080, 0x780, CRC(79fe6c0d) SHA1(4b6fca9379d5199d1347ad1187cbfdebfc4c73e7) )

	ROM_REGION( 0x1000, "chargen", 0 )
	ROM_LOAD( "773000.u5", 0x0000, 0x1000, CRC(d0a2f8fc) SHA1(29aee7ee657778c46e9800abd4955e6d4b33ef68) )

	ROM_REGION( 0x60, "proms", 0 )
	ROM_LOAD( "74ls288.u37", 0x0000, 0x0020, CRC(0a67edd6) SHA1(c1ece8978a3a061e0130d43907fa63a71e75e75d) )
	ROM_LOAD( "74ls288.u38", 0x0020, 0x0020, CRC(5ec93ea7) SHA1(3a84c098474b05d5cbe1939a3e15f66d06470581) )
	ROM_LOAD( "74ls288.u77", 0x0040, 0x0020, CRC(946e03b0) SHA1(24240bdd7bdf507a5b51628fb36ad1266fc53a28) )
ROM_END

COMP( 1982, zorba, 0, 0, zorba, zorba, zorba_state, zorba, "Telcon Industries", "Zorba", GAME_NOT_WORKING )