/
nsg6809.cpp
112 lines (81 loc) · 3.33 KB
/
nsg6809.cpp
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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"
namespace {
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);
private:
void main_map(address_map &map);
required_device<mc6809_device> m_maincpu;
};
void nsg6809_state::main_map(address_map &map)
{
map(0x0000, 0x1fff).ram();
map(0x2800, 0x280f).m("via", FUNC(via6522_device::map));
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
void nsg6809_state::pitchhit(machine_config &config)
{
MC6809(config, m_maincpu, XTAL(4'000'000)); // clock buffered through 74HC4060
m_maincpu->set_addrmap(AS_PROGRAM, &nsg6809_state::main_map);
via6522_device &via(MOS6522(config, "via", XTAL(4'000'000) / 4));
via.irq_handler().set("mainirq", FUNC(input_merger_device::in_w<0>));
mos6551_device &acia(MOS6551(config, "acia", 0));
acia.set_xtal(XTAL(1'843'200));
acia.irq_handler().set("mainirq", FUNC(input_merger_device::in_w<1>));
WATCHDOG_TIMER(config, "deadman", 0);
input_merger_device &merger(INPUT_MERGER_ANY_HIGH(config, "mainirq"));
merger.output_handler().set_inputline(m_maincpu, M6809_IRQ_LINE);
}
/*
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
} // anonymous namespace
GAME(1993, pitchhit, 0, pitchhit, pitchhit, nsg6809_state, empty_init, ROT0, "National Sports Games", "Pitch Hitter - Baseball Challenge", MACHINE_IS_SKELETON_MECHANICAL )