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dec8.cpp: Sound IRQ timing from schematics; eliminate timer_set (nw)

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This commit is contained in:
AJR 2017-08-21 13:50:55 -04:00
parent 6d781aad7f
commit 06e1dd7ab2
2 changed files with 16 additions and 3 deletions
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13
src/mame/drivers/dec8.cpp
View File

@ -145,6 +145,11 @@ void dec8_state::device_timer(emu_timer &timer, device_timer_id id, int param, v
// clear the IRQ request. The MCU does not clear it itself.
m_mcu->set_input_line(MCS51_INT1_LINE, CLEAR_LINE);
break;
case TIMER_DEC8_M6502:
// Gondomania schematics show a LS194 for the sound IRQ, sharing the 6502 clock
// S1=H, S0=L, LSI=H, and QA is the only output connected (to NMI)
m_audiocpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
break;
default:
assert_always(false, "Unknown id in dec8_state::device_timer");
}
@ -157,7 +162,7 @@ WRITE8_MEMBER(dec8_state::dec8_i8751_w)
case 0: /* High byte - SECIRQ is trigged on activating this latch */
m_i8751_value = (m_i8751_value & 0xff) | (data << 8);
m_mcu->set_input_line(MCS51_INT1_LINE, ASSERT_LINE);
timer_set(m_mcu->clocks_to_attotime(64), TIMER_DEC8_I8751); // 64 clocks not confirmed
m_i8751_timer->adjust(m_mcu->clocks_to_attotime(64)); // 64 clocks not confirmed
break;
case 1: /* Low byte */
m_i8751_value = (m_i8751_value & 0xff00) | data;
@ -378,7 +383,8 @@ WRITE8_MEMBER(dec8_state::csilver_control_w)
WRITE8_MEMBER(dec8_state::dec8_sound_w)
{
m_soundlatch->write(space, 0, data);
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
m_audiocpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
m_m6502_timer->adjust(m_audiocpu->cycles_to_attotime(3));
}
WRITE_LINE_MEMBER(dec8_state::csilver_adpcm_int)
@ -1896,6 +1902,9 @@ INTERRUPT_GEN_MEMBER(dec8_state::oscar_interrupt)
void dec8_state::machine_start()
{
m_i8751_timer = timer_alloc(TIMER_DEC8_I8751);
m_m6502_timer = timer_alloc(TIMER_DEC8_M6502);
save_item(NAME(m_latch));
save_item(NAME(m_nmi_enable));
save_item(NAME(m_i8751_port0));

6
src/mame/includes/dec8.h
View File

@ -13,7 +13,8 @@ class dec8_state : public driver_device
public:
enum
{
TIMER_DEC8_I8751
TIMER_DEC8_I8751,
TIMER_DEC8_M6502
};
dec8_state(const machine_config &mconfig, device_type type, const char *tag)
@ -87,6 +88,9 @@ public:
int m_msm5205next;
int m_toggle;
emu_timer *m_i8751_timer;
emu_timer *m_m6502_timer;
DECLARE_WRITE8_MEMBER(dec8_mxc06_karn_buffer_spriteram_w);
DECLARE_READ8_MEMBER(i8751_h_r);
DECLARE_READ8_MEMBER(i8751_l_r);