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casio/pv1000.cpp: Toggle BUSREQ like hardware does; this slows down games to realistic speeds (#12623)

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lidnariq 2024-08-09 01:48:05 +01:00 committed by GitHub
parent b8a506be33
commit dbb097ec52
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1 changed files with 48 additions and 3 deletions
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51
src/mame/casio/pv1000.cpp
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@ -196,6 +196,8 @@ private:
emu_timer *m_irq_on_timer = nullptr;
emu_timer *m_irq_off_timer = nullptr;
emu_timer *m_busrq_on_timer = nullptr;
emu_timer *m_busrq_off_timer = nullptr;
uint8_t m_pcg_bank = 0;
uint8_t m_force_pattern = 0;
uint8_t m_fd_buffer_flag = 0;
@ -212,6 +214,8 @@ private:
uint32_t screen_update_pv1000(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
TIMER_CALLBACK_MEMBER(d65010_irq_on_cb);
TIMER_CALLBACK_MEMBER(d65010_irq_off_cb);
TIMER_CALLBACK_MEMBER(d65010_busrq_on_cb);
TIMER_CALLBACK_MEMBER(d65010_busrq_off_cb);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(cart_load);
required_device<gfxdecode_device> m_gfxdecode;
required_device<screen_device> m_screen;
@ -266,6 +270,17 @@ void pv1000_state::io_w(offs_t offset, uint8_t data)
m_pcg_bank = (data & 0xe0) >> 5;
m_force_pattern = ((data & 0x10) >> 4); /* Dig Dug relies on this */
m_render_disable = ((data & 0x08) >> 3);
if (m_render_disable == 0) // If we're enabling rendering mid-scanline...
{
int hpos = m_screen->hpos(); // set_raw configured so that BUSREQ is asserted from 0 to 248
int vpos = m_screen->vpos();
if (hpos < 248 && vpos >= 26 && vpos < 192+26)
{
m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, ASSERT_LINE);
// The de-assertion is always automatically scheduled
}
}
m_border_col = data & 7;
break;
}
@ -369,12 +384,13 @@ uint32_t pv1000_state::screen_update_pv1000(screen_device &screen, bitmap_ind16
if (tile < 0xe0 || m_force_pattern)
{
tile += (m_pcg_bank << 8);
m_gfxdecode->gfx(0)->opaque(bitmap,cliprect, tile, 0, 0, 0, x*8-16, y*8+26);
//When we adjusted timing in set_raw so that BUSREQ is asserted during a clean rectangle, we need to compensate for that here
m_gfxdecode->gfx(0)->opaque(bitmap,cliprect, tile, 0, 0, 0, x*8+16, y*8+26);
}
else
{
tile -= 0xe0;
m_gfxdecode->gfx(1)->opaque(bitmap,cliprect, tile, 0, 0, 0, x*8-16, y*8+26);
m_gfxdecode->gfx(1)->opaque(bitmap,cliprect, tile, 0, 0, 0, x*8+16, y*8+26);
}
}
}
@ -416,6 +432,31 @@ TIMER_CALLBACK_MEMBER(pv1000_state::d65010_irq_off_cb)
m_maincpu->set_input_line(0, CLEAR_LINE);
}
/* if 0,0 is the top left corner of non-black pixels,
then busreq is asserted at X=288-32 = 256 */
TIMER_CALLBACK_MEMBER(pv1000_state::d65010_busrq_on_cb)
{
int vpos = m_screen->vpos();
int next_vpos = vpos + 1;
if (m_render_disable == 0) {
m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, ASSERT_LINE);
}
// schedule the de-assertion of Busreq that corresponds to the current assertion
m_busrq_off_timer->adjust(m_screen->time_until_pos(vpos,248));
if (vpos >= 192 + 26)
{
next_vpos = 26;
}
m_busrq_on_timer->adjust(m_screen->time_until_pos(next_vpos,0));
}
TIMER_CALLBACK_MEMBER(pv1000_state::d65010_busrq_off_cb)
{
m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, CLEAR_LINE);
}
void pv1000_state::pv1000_postload()
{
@ -428,6 +469,8 @@ void pv1000_state::machine_start()
{
m_irq_on_timer = timer_alloc(FUNC(pv1000_state::d65010_irq_on_cb), this);
m_irq_off_timer = timer_alloc(FUNC(pv1000_state::d65010_irq_off_cb), this);
m_busrq_on_timer = timer_alloc(FUNC(pv1000_state::d65010_busrq_on_cb), this);
m_busrq_off_timer = timer_alloc(FUNC(pv1000_state::d65010_busrq_off_cb), this);
m_gfxram = memregion("gfxram")->base();
save_pointer(NAME(m_gfxram), 0x400);
@ -459,6 +502,8 @@ void pv1000_state::machine_reset()
m_fd_data = 0;
m_irq_on_timer->adjust(m_screen->time_until_pos(195, 0));
m_irq_off_timer->adjust(attotime::never);
m_busrq_on_timer->adjust(m_screen->time_until_pos(26, 0));
m_busrq_off_timer->adjust(m_screen->time_until_pos(26, 248));
}
@ -488,7 +533,7 @@ void pv1000_state::pv1000(machine_config &config)
/* D65010G031 - Video & sound chip */
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_raw(17897725/4, 288, 0, 224, 262, 0, 244);
m_screen->set_raw(17897725/4, 288, 32, 32+224, 262, 0, 244);
// Pixel aspect is 48/35.
// Display aspect is MAME's 4:3 default.