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

        Digital Microsystems ZSBC-3

        11/01/2010 Skeleton driver.
        28/11/2010 Connected to a terminal
        11/01/2011 Converted to Modern.

****************************************************************************

        Monitor commands: [] indicates optional

        Bx = Boot from device x (0 to 7)
        Dx [y] = Dump memory (hex and ascii) in range x [to y]
        Fx y z = Fill memory x to y with z
        Gx = Execute program at address x
        Ix = Display IN of port x
        Ox y = Output y to port x
        Sx = Enter memory editing mode, press enter for next address
        Mx y = unknown (affects memory)
        Tx = unknown (does strange things)
        enter = dump memory from 9000 to 907F (why?)

****************************************************************************

        TODO:
        Everything really...

        Devices of all kinds;
        Use the other rom for something..

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


#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/terminal.h"

#define TERMINAL_TAG "terminal"

class zsbc3_state : public driver_device
{
public:
	zsbc3_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_terminal(*this, TERMINAL_TAG)
	{
	}

	DECLARE_READ8_MEMBER(zsbc3_28_r);
	DECLARE_READ8_MEMBER(zsbc3_2a_r);
	DECLARE_WRITE8_MEMBER(kbd_put);
private:
	UINT8 m_term_data;
	virtual void machine_reset();
	required_device<cpu_device> m_maincpu;
	required_device<generic_terminal_device> m_terminal;
};


READ8_MEMBER( zsbc3_state::zsbc3_28_r )
{
	UINT8 ret = m_term_data;
	m_term_data = 0;
	return ret;
}

READ8_MEMBER( zsbc3_state::zsbc3_2a_r )
{
	return (m_term_data) ? 5 : 4;
}

static ADDRESS_MAP_START(zsbc3_mem, AS_PROGRAM, 8, zsbc3_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE( 0x0000, 0x07ff ) AM_ROM
	AM_RANGE( 0x0800, 0xffff ) AM_RAM
ADDRESS_MAP_END

static ADDRESS_MAP_START(zsbc3_io, AS_IO, 8, zsbc3_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x28, 0x28) AM_READ(zsbc3_28_r) AM_DEVWRITE(TERMINAL_TAG, generic_terminal_device, write)
	AM_RANGE(0x2a, 0x2a) AM_READ(zsbc3_2a_r)
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( zsbc3 )
INPUT_PORTS_END


void zsbc3_state::machine_reset()
{
}

WRITE8_MEMBER( zsbc3_state::kbd_put )
{
	m_term_data = data;
}


static MACHINE_CONFIG_START( zsbc3, zsbc3_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",Z80, XTAL_16MHz /4)
	MCFG_CPU_PROGRAM_MAP(zsbc3_mem)
	MCFG_CPU_IO_MAP(zsbc3_io)

	/* video hardware */
	MCFG_DEVICE_ADD(TERMINAL_TAG, GENERIC_TERMINAL, 0)
	MCFG_GENERIC_TERMINAL_KEYBOARD_CB(WRITE8(zsbc3_state, kbd_put))
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( zsbc3 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "54-3002_zsbc_monitor_1.09.bin", 0x0000, 0x0800, CRC(628588e9) SHA1(8f0d489147ec8382ca007236e0a95a83b6ebcd86))

	ROM_REGION( 0x10000, "hdc", ROMREGION_ERASEFF )
	ROM_LOAD( "54-8622_hdc13.bin", 0x0000, 0x0400, CRC(02c7cd6d) SHA1(494281ba081a0f7fbadfc30a7d2ea18c59e55101))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    INIT     COMPANY               FULLNAME       FLAGS */
COMP( 1980, zsbc3,  0,      0,       zsbc3,     zsbc3, driver_device,   0,   "Digital Microsystems",   "ZSBC-3", MACHINE_NO_SOUND_HW)