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

    Skeleton driver for 68k Single Board Computer

    29/03/2011

    http://www.kmitl.ac.th/~kswichit/68k/68k.html

    TODO:
    - Add RTC (type DS12887)

    All of the address and i/o decoding is done by a pair of XC9536
    mask-programmed custom devices.

    There are some chips used for unclear purposes (GPI, GPO, LCD).

    This computer has no sound, and no facility for saving or loading programs.

    When started, press ? key for a list of commands.

    Has 1MB of flash (which is actually just 12k of program),
    and 1MB of RAM. Memory map should probably be corrected.


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

#include "bus/rs232/rs232.h"
#include "cpu/m68000/m68000.h"
#include "machine/6850acia.h"
#include "machine/clock.h"


class c68ksbc_state : public driver_device
{
public:
	c68ksbc_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_acia(*this, "acia")
	{
	}

	DECLARE_WRITE_LINE_MEMBER(write_acia_clock);

private:
	required_device<cpu_device> m_maincpu;
	required_device<acia6850_device> m_acia;
};

static ADDRESS_MAP_START(c68ksbc_mem, AS_PROGRAM, 16, c68ksbc_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x000000, 0x002fff) AM_ROM
	AM_RANGE(0x003000, 0x5fffff) AM_RAM
	AM_RANGE(0x600000, 0x600001) AM_DEVREADWRITE8("acia", acia6850_device, status_r, control_w, 0x00ff)
	AM_RANGE(0x600002, 0x600003) AM_DEVREADWRITE8("acia", acia6850_device, data_r, data_w, 0x00ff)
ADDRESS_MAP_END


/* Input ports */
static INPUT_PORTS_START( c68ksbc )
INPUT_PORTS_END


WRITE_LINE_MEMBER(c68ksbc_state::write_acia_clock)
{
	m_acia->write_txc(state);
	m_acia->write_rxc(state);
}

static MACHINE_CONFIG_START( c68ksbc, c68ksbc_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", M68000, 8000000) // text says 8MHz, schematic says 10MHz
	MCFG_CPU_PROGRAM_MAP(c68ksbc_mem)

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

	MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal")
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE("acia", acia6850_device, write_rxd))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE("acia", acia6850_device, write_cts))

	MCFG_DEVICE_ADD("acia_clock", CLOCK, 153600)
	MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(c68ksbc_state, write_acia_clock))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( 68ksbc )
	ROM_REGION(0x1000000, "maincpu", 0)
	ROM_LOAD( "t68k.bin", 0x0000, 0x2f78, CRC(20a8d0d0) SHA1(544fd8bd8ed017115388c8b0f7a7a59a32253e43) )
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    CLASS         INIT    COMPANY                FULLNAME               FLAGS */
COMP( 2002, 68ksbc,   0,       0,    c68ksbc,   c68ksbc, driver_device,  0,  "Wichit Sirichote", "68k Single Board Computer", GAME_NO_SOUND_HW)