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ctvboy: change vblank irq to pulse line

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This commit is contained in:
hap 2024-01-17 12:37:05 +01:00
parent 5afaad4e42
commit e593e10089
1 changed files with 9 additions and 2 deletions
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11
src/mame/misc/ctvboy.cpp
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@ -80,6 +80,7 @@ private:
void mc6847_w(u8 data);
u8 mc6847_vram_r(offs_t offset);
void vblank_irq(int state);
};
@ -182,6 +183,12 @@ u8 ctvboy_state::mc6847_vram_r(offs_t offset)
return data;
}
void ctvboy_state::vblank_irq(int state)
{
if (!state)
m_maincpu->pulse_input_line(M6801_IRQ_LINE, attotime::from_usec(50));
}
/*******************************************************************************
@ -205,7 +212,7 @@ static INPUT_PORTS_START( ctvboy )
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_UNUSED)
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON1) // A
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON2) // START / B
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_START) PORT_NAME("Pause")
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_SELECT) PORT_NAME("Pause")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_UNUSED)
PORT_START("IN.1")
@ -234,7 +241,7 @@ void ctvboy_state::ctvboy(machine_config &config)
// video hardware
MC6847_NTSC(config, m_mc6847, 3.579545_MHz_XTAL);
m_mc6847->input_callback().set(FUNC(ctvboy_state::mc6847_vram_r));
m_mc6847->fsync_wr_callback().set_inputline(m_maincpu, 0, HOLD_LINE).invert();
m_mc6847->fsync_wr_callback().set(FUNC(ctvboy_state::vblank_irq));
m_mc6847->set_screen(m_screen);
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);