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bus/nes: Corrected VRC4/6/7 IRQ pseudo-scanline counter. (#8695)

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- This eliminates the constant shaking in TMNT2J and Akumajo Special's status bars and full screen shaking in some vertical stages (Clock Tower at least) in Akumajo Densetsu.
This commit is contained in:
0kmg 2021-10-14 06:57:04 -08:00 committed by GitHub
parent ffe92ecc72
commit 0c7a624ce9
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 21 deletions
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38
src/devices/bus/nes/konami.cpp
View File

@ -174,7 +174,7 @@ void nes_konami_vrc4_device::pcb_reset()
chr8(0, m_chr_source);
m_irq_mode = 0;
m_irq_prescale = 341;
m_irq_prescale = 0;
m_irq_enable = 0;
m_irq_enable_latch = 0;
m_irq_count = 0;
@ -214,7 +214,7 @@ void nes_konami_vrc7_device::pcb_reset()
chr8(0, m_chr_source);
m_irq_mode = 0;
m_irq_prescale = 341;
m_irq_prescale = 0;
m_irq_enable = 0;
m_irq_enable_latch = 0;
m_irq_count = 0;
@ -468,6 +468,19 @@ void nes_konami_vrc4_device::device_timer(emu_timer &timer, device_timer_id id,
}
}
void nes_konami_vrc4_device::irq_ctrl_w(uint8_t data)
{
m_irq_mode = data & 0x04;
m_irq_enable = data & 0x02;
m_irq_enable_latch = data & 0x01;
if (m_irq_enable)
{
m_irq_count = m_irq_count_latch;
m_irq_prescale = 341;
}
set_irq_line(CLEAR_LINE);
}
void nes_konami_vrc4_device::set_prg()
{
if (m_latch & 0x02)
@ -534,12 +547,7 @@ void nes_konami_vrc4_device::write_h(offs_t offset, uint8_t data)
m_irq_count_latch = (m_irq_count_latch & 0x0f) | ((data & 0x0f) << 4);
break;
case 0x200:
m_irq_mode = data & 0x04;
m_irq_enable = data & 0x02;
m_irq_enable_latch = data & 0x01;
if (data & 0x02)
m_irq_count = m_irq_count_latch;
set_irq_line(CLEAR_LINE);
irq_ctrl_w(data);
break;
case 0x300:
m_irq_enable = m_irq_enable_latch;
@ -608,12 +616,7 @@ void nes_konami_vrc6_device::write_h(offs_t offset, uint8_t data)
m_irq_count_latch = data;
break;
case 0x100:
m_irq_mode = data & 0x04;
m_irq_enable = data & 0x02;
m_irq_enable_latch = data & 0x01;
if (data & 0x02)
m_irq_count = m_irq_count_latch;
set_irq_line(CLEAR_LINE);
irq_ctrl_w(data);
break;
case 0x200:
m_irq_enable = m_irq_enable_latch;
@ -719,12 +722,7 @@ void nes_konami_vrc7_device::write_h(offs_t offset, uint8_t data)
m_irq_count_latch = data;
break;
case 0x7000:
m_irq_mode = data & 0x04;
m_irq_enable = data & 0x02;
m_irq_enable_latch = data & 0x01;
if (data & 0x02)
m_irq_count = m_irq_count_latch;
set_irq_line(CLEAR_LINE);
irq_ctrl_w(data);
break;
case 0x7008: case 0x7010: case 0x7018:
m_irq_enable = m_irq_enable_latch;

3
src/devices/bus/nes/konami.h
View File

@ -109,7 +109,8 @@ protected:
uint8_t m_latch, m_mmc_prg_bank;
void irq_tick();
uint16_t m_irq_count, m_irq_count_latch;
void irq_ctrl_w(uint8_t data);
uint8_t m_irq_count, m_irq_count_latch;
int m_irq_enable, m_irq_enable_latch;
int m_irq_mode;
int m_irq_prescale;