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some experimentation (nw)

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This commit is contained in:
David Haywood 2014-03-18 17:57:25 +00:00
parent 6fe765a89b
commit 2ffec07266
1 changed files with 56 additions and 25 deletions
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81
src/mame/drivers/megaphx.c
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@ -87,6 +87,7 @@ public:
m_tms(*this, "tms")
{
m_shiftfull = 0;
m_soundirq = 0;
}
required_device<cpu_device> m_maincpu;
@ -105,9 +106,6 @@ public:
DECLARE_DRIVER_INIT(megaphx);
DECLARE_MACHINE_RESET(megaphx);
DECLARE_CUSTOM_INPUT_MEMBER(megaphx_rand_r);
DECLARE_READ16_MEMBER(megaphx_0x050002_r);
DECLARE_WRITE16_MEMBER(megaphx_0x050000_w);
DECLARE_READ8_MEMBER(megaphx_sound_sent_r);
@ -160,16 +158,33 @@ public:
UINT8 m_soundback;
int m_shiftfull; // this might be a driver specific hack for a TMS bug.
// hacks for test purposes, these are installed over the program rom so we know when irqs are actually taken
DECLARE_READ8_MEMBER(megaphx_02cc_hack_r) { logerror("%04x audicpu IRQ hack 0x02cc\n", machine().device("audiocpu")->safe_pc()); int bank = m_soundbank[0] & 7; membank("snddata")->set_entry(bank); return memregion("audiocpu")->base()[0x02cc]; };
DECLARE_READ8_MEMBER(megaphx_02e6_hack_r) { logerror("%04x audicpu IRQ hack 0x02e6\n", machine().device("audiocpu")->safe_pc()); int bank = m_soundbank[1] & 7; membank("snddata")->set_entry(bank); return memregion("audiocpu")->base()[0x02e6]; };
DECLARE_READ8_MEMBER(megaphx_0309_hack_r) { logerror("%04x audicpu IRQ hack 0x0309\n", machine().device("audiocpu")->safe_pc()); int bank = m_soundbank[2] & 7; membank("snddata")->set_entry(bank); return memregion("audiocpu")->base()[0x0309]; };
DECLARE_READ8_MEMBER(megaphx_0323_hack_r) { logerror("%04x audicpu IRQ hack 0x0323\n", machine().device("audiocpu")->safe_pc()); int bank = m_soundbank[3] & 7; membank("snddata")->set_entry(bank); return memregion("audiocpu")->base()[0x0323]; };
void install_sound_hacks(void)
{
address_space &space = m_audiocpu->space(AS_PROGRAM);
space.install_read_handler(0x02cc, 0x02cc, read8_delegate(FUNC(megaphx_state::megaphx_02cc_hack_r), this));
space.install_read_handler(0x02e6, 0x02e6, read8_delegate(FUNC(megaphx_state::megaphx_02e6_hack_r), this));
space.install_read_handler(0x0309, 0x0309, read8_delegate(FUNC(megaphx_state::megaphx_0309_hack_r), this));
space.install_read_handler(0x0323, 0x0323, read8_delegate(FUNC(megaphx_state::megaphx_0323_hack_r), this));
}
int m_soundirq;
void update_sound_irqs(void)
{
if (m_soundirq) m_audiocpu->set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);
else m_audiocpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
}
};
CUSTOM_INPUT_MEMBER(megaphx_state::megaphx_rand_r)
{
return rand();
}
@ -677,37 +692,52 @@ static I8255A_INTERFACE( ppi8255_intf_0 )
WRITE_LINE_MEMBER(megaphx_state::z80ctc_ch0)
{
int bank = m_soundbank[0] & 7;
membank("snddata")->set_entry(bank);
m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
// int bank = m_soundbank[0] & 7; membank("snddata")->set_entry(bank);
// m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
if (state) m_soundirq |= 0x1;
else m_soundirq &= ~0x1;
update_sound_irqs();
}
WRITE_LINE_MEMBER(megaphx_state::z80ctc_ch1)
{
int bank = m_soundbank[1] & 7;
membank("snddata")->set_entry(bank);
m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
// int bank = m_soundbank[1] & 7; membank("snddata")->set_entry(bank);
// m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
if (state) m_soundirq |= 0x2;
else m_soundirq &= ~0x2;
update_sound_irqs();
}
WRITE_LINE_MEMBER(megaphx_state::z80ctc_ch2)
{
int bank = m_soundbank[2] & 7;
membank("snddata")->set_entry(bank);
m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
// int bank = m_soundbank[2] & 7; membank("snddata")->set_entry(bank);
// m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
if (state) m_soundirq |= 0x4;
else m_soundirq &= ~0x4;
update_sound_irqs();
}
WRITE_LINE_MEMBER(megaphx_state::z80ctc_ch3)
{
int bank = m_soundbank[3] & 7;
membank("snddata")->set_entry(bank);
m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
// int bank = m_soundbank[3] & 7; membank("snddata")->set_entry(bank);
// m_audiocpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE);
if (state) m_soundirq |= 0x8;
else m_soundirq &= ~0x8;
update_sound_irqs();
}
static Z80CTC_INTERFACE( z80ctc_intf ) // runs in IM2 , vector set to 0x20 , values there are 0xCC, 0x02, 0xE6, 0x02, 0x09, 0x03, 0x23, 0x03 (so 02cc, 02e6, 0309, 0323, all of which are valid irq handlers)
{
DEVCB_DRIVER_LINE_MEMBER(megaphx_state, z80ctc_ch0), // for channel 0
@ -733,11 +763,10 @@ static GFXDECODE_START( megaphx )
GFXDECODE_ENTRY( "roms67", 0, megaphxlay, 0x0000, 1 )
GFXDECODE_END
#define FAKE_BOOST 1
static MACHINE_CONFIG_START( megaphx, megaphx_state )
MCFG_CPU_ADD("maincpu", M68000, 8000000 * FAKE_BOOST) // ?? can't read xtal due to reflections, CPU is an 8Mhz part // CLEARLY the 'rand' flags have more meaning (but don't seem to be vblank) I shouldn't have to do a *16 on the 68k clock just to get all the gfx!
MCFG_CPU_ADD("maincpu", M68000, 8000000) // ?? can't read xtal due to reflections, CPU is an 8Mhz part
MCFG_CPU_PROGRAM_MAP(megaphx_68k_map)
// MCFG_CPU_VBLANK_INT_DRIVER("screen", megaphx_state, irq6_line_hold)
@ -746,7 +775,7 @@ static MACHINE_CONFIG_START( megaphx, megaphx_state )
MCFG_CPU_CONFIG(tms_config_megaphx)
MCFG_CPU_PROGRAM_MAP(megaphx_tms_map)
MCFG_CPU_ADD("audiocpu", Z80, 4000000 * FAKE_BOOST) // unk freq
MCFG_CPU_ADD("audiocpu", Z80, 8000000) // unk freq
MCFG_CPU_CONFIG(daisy_chain)
MCFG_CPU_PROGRAM_MAP(sound_map)
MCFG_CPU_IO_MAP(sound_io)
@ -792,6 +821,8 @@ DRIVER_INIT_MEMBER(megaphx_state,megaphx)
membank("snddata")->configure_entries(0, 8, memregion("user2")->base(), 0x8000);
membank("snddata")->set_entry(0);
install_sound_hacks();
}