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

    Poly/Proteus (New Zealand)

    10/07/2011 Skeleton driver.

    http://www.cs.otago.ac.nz/homepages/andrew/poly/Poly.htm

    Andrew has supplied the roms for -bios 1

    It uses a 6809 for all main functions. There is a Z80 for CP/M, but all
    of the roms are 6809 code.

    The keyboard controller is one of those custom XR devices.
    Will use the terminal keyboard instead.

    With bios 1, after entering your userid and password, you get a black
    screen. This is normal, because it joins to a network which isn't there.

    ToDo:
    - Almost Everything!
    - Connect up the device ports & lines
    - Find out about graphics mode and how it is selected
    - Fix Keyboard so that the Enter key tells BASIC to do something
    - Find out how to make 2nd teletext screen to display
    - Banking

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

#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "cpu/z80/z80.h"
#include "machine/6821pia.h"
#include "machine/6840ptm.h"
#include "machine/6850acia.h"
#include "machine/clock.h"
#include "machine/keyboard.h"
#include "machine/mc6854.h"
#include "sound/spkrdev.h"
#include "video/saa5050.h"
#include "screen.h"
#include "speaker.h"


class poly_state : public driver_device
{
public:
	poly_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_pia0(*this, "pia0")
		, m_pia1(*this, "pia1")
		, m_ptm(*this, "ptm")
		, m_speaker(*this, "speaker")
		, m_acia_clock(*this, "acia_clock")
		, m_videoram(*this, "videoram")
	{ }

	void kbd_put(u8 data);
	DECLARE_READ8_MEMBER(pia1_b_in);
	DECLARE_READ8_MEMBER(videoram_r);
	DECLARE_WRITE_LINE_MEMBER( ptm_o2_callback );
	DECLARE_WRITE_LINE_MEMBER( ptm_o3_callback );
	DECLARE_WRITE8_MEMBER(baud_rate_w);

	void poly(machine_config &config);
	void poly_mem(address_map &map);
protected:
	virtual void machine_reset() override;

private:
	required_device<cpu_device> m_maincpu;
	required_device<pia6821_device> m_pia0;
	required_device<pia6821_device> m_pia1;
	required_device<ptm6840_device> m_ptm;
	required_device<speaker_sound_device> m_speaker;
	required_device<clock_device> m_acia_clock;
	required_shared_ptr<uint8_t> m_videoram;
	uint8_t m_term_data;
};


void poly_state::poly_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x9fff).ram();
	map(0xa000, 0xcfff).rom();
	map(0xd000, 0xdfff).ram();
	map(0xe000, 0xe003).rw(m_pia0, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); //video control PIA 6821
	map(0xe004, 0xe005).rw("acia", FUNC(acia6850_device::read), FUNC(acia6850_device::write));
	map(0xe006, 0xe006).w(this, FUNC(poly_state::baud_rate_w));
	map(0xe00c, 0xe00f).rw(m_pia1, FUNC(pia6821_device::read), FUNC(pia6821_device::write)); //keyboard PIA 6821
	map(0xe020, 0xe027).rw(m_ptm, FUNC(ptm6840_device::read), FUNC(ptm6840_device::write)); //timer 6840
	map(0xe030, 0xe037).rw("adlc", FUNC(mc6854_device::read), FUNC(mc6854_device::write)); //Data Link Controller 6854
	map(0xe040, 0xe040).noprw(); //Set protect flip-flop after 1 E-cycle
	map(0xe050, 0xe05f).ram(); //Dynamic Address Translater (arranges memory banks)
	// AM_RANGE(0xe060,0xe060) Select Map 1
	// AM_RANGE(0xe070,0xe070) Select Map 2
	map(0xe800, 0xebbf).ram().share("videoram");
	map(0xebc0, 0xebff).ram();
	map(0xec00, 0xefbf).ram(); // screen 2 AM_SHARE("videoram")
	map(0xefc0, 0xefff).ram();
	map(0xf000, 0xffff).rom();
}


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


void poly_state::machine_reset()
{
}

READ8_MEMBER( poly_state::pia1_b_in )
{
// return ascii key value, bit 7 is the strobe value
	uint8_t data = m_term_data;
	m_term_data &= 0x7f;
	return data;
}

READ8_MEMBER( poly_state::videoram_r )
{
	return m_videoram[offset];
}

void poly_state::kbd_put(u8 data)
{
	m_term_data = data | 0x80;

	m_pia1->cb1_w(1);
	m_pia1->cb1_w(0);
}

WRITE_LINE_MEMBER( poly_state::ptm_o2_callback )
{
	m_ptm->set_c1(state);
}

WRITE_LINE_MEMBER( poly_state::ptm_o3_callback )
{
	m_speaker->level_w(state);
}

WRITE8_MEMBER(poly_state::baud_rate_w)
{
	// baud rate controller (0=9600,2=4800,4=2400,6=1200,8=600,A=300)
	int selector = (data & 0x0e) >> 1;
	m_acia_clock->set_clock_scale((selector <= 5) ? 1.0 / (1 << selector) : 0.0);
}

MACHINE_CONFIG_START(poly_state::poly)
	/* basic machine hardware */
	MCFG_DEVICE_ADD("maincpu", MC6809, XTAL(12'057'600) / 3) // nominally 4 MHz
	MCFG_DEVICE_PROGRAM_MAP(poly_mem)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
	MCFG_SCREEN_SIZE(40 * 12, 24 * 20)
	MCFG_SCREEN_VISIBLE_AREA(0, 40 * 12 - 1, 0, 24 * 20 - 1)
	MCFG_SCREEN_UPDATE_DEVICE("saa5050", saa5050_device, screen_update)

	/* sound hardware */
	SPEAKER(config, "mono").front_center();
	MCFG_DEVICE_ADD("speaker", SPEAKER_SOUND)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	/* Devices */
	MCFG_DEVICE_ADD("saa5050", SAA5050, XTAL(12'057'600) / 2)
	MCFG_SAA5050_D_CALLBACK(READ8(*this, poly_state, videoram_r))
	MCFG_SAA5050_SCREEN_SIZE(40, 24, 40)

	MCFG_DEVICE_ADD("pia0", PIA6821, 0)
	MCFG_PIA_IRQA_HANDLER(INPUTLINE("maincpu", M6809_IRQ_LINE))
	MCFG_PIA_IRQB_HANDLER(INPUTLINE("maincpu", M6809_IRQ_LINE))

	MCFG_DEVICE_ADD("pia1", PIA6821, 0)
	MCFG_PIA_READPB_HANDLER(READ8(*this, poly_state, pia1_b_in))
	// CB1 kbd strobe
	MCFG_PIA_IRQA_HANDLER(INPUTLINE("maincpu", M6809_IRQ_LINE))
	MCFG_PIA_IRQB_HANDLER(INPUTLINE("maincpu", M6809_IRQ_LINE))

	MCFG_DEVICE_ADD("ptm", PTM6840, XTAL(12'057'600) / 3)
	MCFG_PTM6840_EXTERNAL_CLOCKS(0, 0, 0)
	MCFG_PTM6840_O2_CB(WRITELINE(*this, poly_state, ptm_o2_callback))
	MCFG_PTM6840_O3_CB(WRITELINE(*this, poly_state, ptm_o3_callback))
	MCFG_PTM6840_IRQ_CB(INPUTLINE("maincpu", M6809_IRQ_LINE))

	MCFG_DEVICE_ADD("acia", ACIA6850, 0)
	//MCFG_ACIA6850_TXD_HANDLER(WRITELINE("rs232", rs232_port_device, write_txd))
	//MCFG_ACIA6850_RTS_HANDLER(WRITELINE("rs232", rs232_port_device, write_rts))

	MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600)
	MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE("acia", acia6850_device, write_txc))
	MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("acia", acia6850_device, write_rxc))

	MCFG_DEVICE_ADD("adlc", MC6854, 0)

	MCFG_DEVICE_ADD("keyboard", GENERIC_KEYBOARD, 0)
	MCFG_GENERIC_KEYBOARD_CB(PUT(poly_state, kbd_put))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( poly1 )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_SYSTEM_BIOS(0, "bios0", "Standalone")
	ROMX_LOAD( "v3bas1.bin", 0xa000, 0x1000, CRC(2c5276cb) SHA1(897cb9c2456ddb0f316a8c3b8aa56706056cc1dd), ROM_BIOS(1) )
	ROMX_LOAD( "v3bas2.bin", 0xb000, 0x1000, CRC(30f99447) SHA1(a26170113a968ccd8df7db1b0f256a2198054037), ROM_BIOS(1) )
	ROMX_LOAD( "v3bas3.bin", 0xc000, 0x1000, CRC(89ea5b27) SHA1(e37a61d3dd78fb40bc43c70af9714ce3f75fd895), ROM_BIOS(1) )
	ROMX_LOAD( "v3bas4.bin", 0x9000, 0x1000, CRC(c16c1209) SHA1(42f3b0bce32aafab14bc0500fb13bd456730875c), ROM_BIOS(1) )
	// boot rom
	ROMX_LOAD( "plrt16v3e9.bin", 0xf000, 0x1000, CRC(453c10a0) SHA1(edfbc3d83710539c01093e89fe1b47dfe1e68acd), ROM_BIOS(1) )

	ROM_SYSTEM_BIOS(1, "bios1", "Terminal")
	// supplied by Andrew Trotman, author of Poly1 emulator (PolyROM v3.4)
	ROMX_LOAD( "v2bas1.bin", 0xa000, 0x1000, CRC(f8c5adc4) SHA1(b1a16d7d996909185495b15a52afa697324e1f8d), ROM_BIOS(2) )
	ROMX_LOAD( "v2bas2.bin", 0xb000, 0x1000, CRC(a2b0fa4d) SHA1(05ab723eb2e2b09325380a1a72da5ade401847d1), ROM_BIOS(2) )
	ROMX_LOAD( "v2bas3.bin", 0xc000, 0x1000, CRC(04a58be5) SHA1(729fa02c76783213e40bb179e60c09d4b439ab90), ROM_BIOS(2) )
	ROMX_LOAD( "v2bas4.bin", 0x9000, 0x1000, CRC(328fe790) SHA1(43dca92092b27627603d3588f91cf9eca24ed29f), ROM_BIOS(2) )
	ROMX_LOAD( "slrt14_00f9.bin", 0xf000, 0x1000, CRC(6559a2ce) SHA1(7c38f449ca122342732123b56992ed0c446406c2), ROM_BIOS(2) )
ROM_END

/* Driver */

//    YEAR  NAME   PARENT  COMPAT  MACHINE  INPUT  CLASS       INIT        COMPANY     FULLNAME                       FLAGS
COMP( 1981, poly1, 0,      0,      poly,    poly,  poly_state, empty_init, "Polycorp", "Poly-1 Educational Computer", MACHINE_NOT_WORKING )