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kchamp: improve sound nmi frequency

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This commit is contained in:
hap 2024-12-08 15:06:08 +01:00
parent 8dbd36390c
commit 8c31c9615e
2 changed files with 6 additions and 6 deletions
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10
src/mame/dataeast/kchamp.cpp
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@ -377,7 +377,7 @@ void kchamp_state::msmint(int state)
* 1 Player Version *
********************/
INTERRUPT_GEN_MEMBER(kchamp_state::sound_int)
INTERRUPT_GEN_MEMBER(kchamp_state::sound_nmi)
{
if (m_sound_nmi_enable)
device.execute().set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
@ -426,7 +426,7 @@ void kchamp_state::kchampvs(machine_config &config)
// Video hardware
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(12_MHz_XTAL / 2, 384, 0, 256, 264, 16, 240); // 59.10 Hz refresh verified on PCB
screen.set_raw(12_MHz_XTAL / 2, 384, 0, 256, 264, 16, 240); // 59.10 Hz refresh measured on PCB
screen.set_screen_update(FUNC(kchamp_state::screen_update_kchampvs));
screen.set_palette(m_palette);
screen.screen_vblank().set(FUNC(kchamp_state::vblank_irq));
@ -467,9 +467,9 @@ void kchamp_state::kchamp(machine_config &config)
m_audiocpu->z80_set_m1_cycles(4+1); // voice matches PCB recordings
m_audiocpu->set_addrmap(AS_PROGRAM, &kchamp_state::kchamp_sound_map);
m_audiocpu->set_addrmap(AS_IO, &kchamp_state::kchamp_sound_io_map);
m_audiocpu->set_periodic_int(FUNC(kchamp_state::sound_int), attotime::from_hz(125));
// IRQs triggered from main CPU
// NMIs from 125Hz clock
attotime sound_nmi_period = attotime::from_ticks(0x10000, 8_MHz_XTAL); // ~122 Hz
m_audiocpu->set_periodic_int(FUNC(kchamp_state::sound_nmi), sound_nmi_period);
ls259_device &mainlatch(LS259(config, "mainlatch")); // IC71
mainlatch.q_out_cb<0>().set(FUNC(kchamp_state::flip_screen_set));

2
src/mame/dataeast/kchamp.h
View File

@ -89,7 +89,7 @@ private:
uint32_t screen_update_kchampvs(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
uint32_t screen_update_kchamp(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
void vblank_irq(int state);
INTERRUPT_GEN_MEMBER(sound_int);
INTERRUPT_GEN_MEMBER(sound_nmi);
void draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect, int dx, int dy);
void decrypt_code();
void msmint(int state);