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

    Skeleton driver for 6809-based mechanical games by National Sports
    Games, Inc. (a division of Skee-Ball Inc.):

    * Pitch Hitter - Baseball Challenge
    * Super Shot (undumped)
    * UB-QB - Football Challenge (undumped)

    Memory map for "Universal Game PCB" in Super Shot schematics:

                2K SRAM             8K SRAM
           JP5-A JP6-B JP7-B   JP5-B JP6-A JP7-A

    *AUX3     $6000-$7FFF         $6000-$7FFF
    *AUX2     $2000-$3FFF         $2000-$27FF
    *AUX1     $4000-$5FFF         $4000-$5FFF
    *ASIC     $1000-$17FF         $3000-$37FF
    *VIA      $0800-$0FFF         $2800-$2FFF
    *SRAM     $0000-$07FF         $0000-$1FFF
    DEADMAN   $1E00-$1FFF         $3E00-$3FFF
    *IN-D     $1E00-$1FFF         $3E00-$3FFF
    *OUT-C    $1C00-$1DFF         $3C00-$3DFF
    *IN-C     $1C00-$1DFF         $3C00-$3DFF
    *OUT-B    $1A00-$1BFF         $3A00-$3BFF
    *IN-B     $1A00-$1BFF         $3A00-$3BFF
    *OUT-A    $1800-$19FF         $3800-$39FF
    *IN-A     $1800-$19FF         $3800-$39FF

    "ASIC" is a rather odd thing to call a 6551...

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

#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "machine/6522via.h"
#include "machine/input_merger.h"
#include "machine/mos6551.h"
#include "machine/watchdog.h"


class nsg6809_state : public driver_device
{
public:
	nsg6809_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
	{
	}

	void pitchhit(machine_config &config);

protected:
	void main_map(address_map &map);

private:
	required_device<cpu_device> m_maincpu;
};


void nsg6809_state::main_map(address_map &map)
{
	map(0x0000, 0x1fff).ram();
	map(0x2800, 0x280f).rw("via", FUNC(via6522_device::read), FUNC(via6522_device::write));
	map(0x3000, 0x3003).rw("acia", FUNC(mos6551_device::read), FUNC(mos6551_device::write));
	map(0x3e00, 0x3e00).w("deadman", FUNC(watchdog_timer_device::reset_w));
	map(0x8000, 0xffff).rom().region("maincpu", 0);
}

static INPUT_PORTS_START( pitchhit )
INPUT_PORTS_END

MACHINE_CONFIG_START(nsg6809_state::pitchhit)
	MCFG_DEVICE_ADD("maincpu", MC6809, XTAL(4'000'000)) // clock buffered through 74HC4060
	MCFG_DEVICE_PROGRAM_MAP(main_map)

	MCFG_DEVICE_ADD("via", VIA6522, XTAL(4'000'000) / 4)
	MCFG_VIA6522_IRQ_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<0>))

	MCFG_DEVICE_ADD("acia", MOS6551, 0)
	MCFG_MOS6551_XTAL(XTAL(1'843'200))
	MCFG_MOS6551_IRQ_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<1>))

	MCFG_WATCHDOG_ADD("deadman")

	MCFG_INPUT_MERGER_ANY_HIGH("mainirq")
	MCFG_INPUT_MERGER_OUTPUT_HANDLER(INPUTLINE("maincpu", M6809_IRQ_LINE))
MACHINE_CONFIG_END


/*

Pitch Hitter Eprom 27c256 by National Sports Games (aka Skeeball)
location U-14

IC label "PH101C"  and  "CK# $A790"

*/

ROM_START( pitchhit )
	ROM_REGION( 0x8000, "maincpu", 0 )
	ROM_LOAD( "ph101c__ck_a790.u14", 0x0000, 0x8000, CRC(1d306ab7) SHA1(13faf7c6dca8e5482672b2d09a99616896c4ae55) )
ROM_END


GAME(1993, pitchhit, 0, pitchhit, pitchhit, nsg6809_state, empty_init, ROT0, "National Sports Games", "Pitch Hitter - Baseball Challenge", MACHINE_IS_SKELETON_MECHANICAL )