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Tempest: instead of running at perfect interleave constantly use boost_interleave when address ae1f is read. Brings tempest back to 800%

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Couriersud 2014-04-19 12:51:10 +00:00
parent 464f7eb46d
commit dbb294be92
1 changed files with 24 additions and 3 deletions
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27
src/mame/drivers/tempest.c
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@ -298,6 +298,7 @@ public:
m_maincpu(*this, "maincpu"),
m_mathbox(*this, "mathbox"),
m_avg(*this, "avg"),
m_rom(*this, "maincpu"),
m_knob_p1(*this, TEMPEST_KNOB_P1_TAG),
m_knob_p2(*this, TEMPEST_KNOB_P2_TAG),
m_buttons_p1(*this, TEMPEST_BUTTONS_P1_TAG),
@ -309,6 +310,7 @@ public:
required_device<cpu_device> m_maincpu;
required_device<mathbox_device> m_mathbox;
required_device<avg_tempest_device> m_avg;
required_memory_region m_rom;
required_ioport m_knob_p1;
required_ioport m_knob_p2;
@ -326,7 +328,10 @@ public:
DECLARE_CUSTOM_INPUT_MEMBER(clock_r);
DECLARE_READ8_MEMBER(input_port_1_bit_r);
DECLARE_READ8_MEMBER(input_port_2_bit_r);
virtual void machine_start();
DECLARE_READ8_MEMBER(rom_read);
virtual void machine_start();
};
@ -416,6 +421,20 @@ WRITE8_MEMBER(tempest_state::tempest_coin_w)
*
*************************************/
READ8_MEMBER(tempest_state::rom_read)
{
const UINT8 *rom = m_rom->base();
const int real_addr = offset + 0xa800;
if (real_addr == 0xAE1F)
{
machine().scheduler().boost_interleave(attotime::zero, attotime::from_usec(100));
machine().scheduler().abort_timeslice();
}
return rom[real_addr];
}
static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, tempest_state )
AM_RANGE(0x0000, 0x07ff) AM_RAM
AM_RANGE(0x0800, 0x080f) AM_WRITEONLY AM_SHARE("colorram")
@ -437,7 +456,9 @@ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, tempest_state )
AM_RANGE(0x60c0, 0x60cf) AM_DEVREADWRITE("pokey1", pokey_device, read, write)
AM_RANGE(0x60d0, 0x60df) AM_DEVREADWRITE("pokey2", pokey_device, read, write)
AM_RANGE(0x60e0, 0x60e0) AM_WRITE(tempest_led_w)
AM_RANGE(0x9000, 0xdfff) AM_ROM
AM_RANGE(0x9000, 0xa7ff) AM_ROM
AM_RANGE(0xa800, 0xafff) AM_READ(rom_read)
AM_RANGE(0xb000, 0xdfff) AM_ROM
AM_RANGE(0xf000, 0xffff) AM_ROM /* for the reset / interrupt vectors */
ADDRESS_MAP_END
@ -609,7 +630,7 @@ static MACHINE_CONFIG_START( tempest, tempest_state )
MCFG_CPU_PROGRAM_MAP(main_map)
/* needed to ensure routine at ae1c passes checks and does not corrupt data */
MCFG_QUANTUM_PERFECT_CPU("maincpu")
// MCFG_QUANTUM_PERFECT_CPU("maincpu")
MCFG_CPU_PERIODIC_INT_DRIVER(tempest_state, irq0_line_assert, CLOCK_3KHZ / 12)
MCFG_WATCHDOG_TIME_INIT(attotime::from_hz(CLOCK_3KHZ / 256))