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igt/gkigt.cpp: debug notes, preliminary background layer

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This commit is contained in:
angelosa 2024-09-27 21:35:01 +02:00
parent 5f54fda4da
commit 9c54072486
1 changed files with 44 additions and 5 deletions
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49
src/mame/igt/gkigt.cpp
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@ -10,6 +10,16 @@ TODO:
- understand what's "netflex" device;
- CMOS never get properly initialized?
- Eventually uses a touchscreen;
- Hangs on soft reset;
gkigt4 debug hang points:
bp 8035d58,1,{r8=1;g} ; skip QUART not running (will save to NVRAM afterwards)
bp 802491c,1,{g4=1;g} ; buffer at $10000308, irq?
bp 80249f4,1,{g4=1;g} ; ^
bp 80773f4,1,{g4=0;g} ; senet irq 2
bp 8177f48,1,{ip+=4;g} ; EEPROM CRC error / identification failure
===================================================================================================
Game King board types:
@ -149,6 +159,23 @@ uint32_t igt_gameking_state::screen_update(screen_device &screen, bitmap_ind16 &
{
bitmap.fill(m_palette->black_pen(), cliprect);
const u32 fg_base_offset = 0x100000;
for(int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for(int x = cliprect.min_x; x <= cliprect.max_x; x+=4)
{
// TODO: format is quite the mystery
// 15-8 / 7-0 color cluts, 31-16 fill mask?
const u32 gfx_data = m_vram[(fg_base_offset + x + (y >> 2) * 1024) / 4];
uint32_t const color = (gfx_data >> (8)) & 0xff;
for(int xi = 0; xi < 4; xi++)
{
bitmap.pix(y, x+xi) = m_palette->pen(color);
}
}
}
for(int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for(int x = cliprect.min_x; x <= cliprect.max_x; x+=4)
@ -158,12 +185,13 @@ uint32_t igt_gameking_state::screen_update(screen_device &screen, bitmap_ind16 &
for(int xi = 0; xi < 4; xi++)
{
uint32_t const color = (gfx_data >> (xi*8)) & 0xff;
bitmap.pix(y, x+xi) = m_palette->pen(color);
if (color)
bitmap.pix(y, x+xi) = m_palette->pen(color);
}
}
}
// TODO: tilemap at $18100000
return 0;
}
@ -174,12 +202,23 @@ void igt_gameking_state::igt_gameking_map(address_map &map)
map(0x08000000, 0x081fffff).flags(i960_cpu_device::BURST).rom().region("game", 0);
map(0x08200000, 0x083fffff).flags(i960_cpu_device::BURST).rom().region("plx", 0);
// map(0x0ac00000, 0x0ac0000f) - board identifiers?
// map(0x0ae00000, 0x0ae0000f) /
// it's unclear how much of this is saved and how much total RAM there is.
map(0x10000000, 0x1001ffff).flags(i960_cpu_device::BURST).ram().share("nvram");
map(0x10020000, 0x17ffffff).flags(i960_cpu_device::BURST).ram();
map(0x18000000, 0x181fffff).flags(i960_cpu_device::BURST).ram().share("vram"); // igtsc writes from 18000000 to 1817ffff, ms3 all the way to 181fffff.
// map(0x18200000, 0x18200003) video related?
map(0x18200000, 0x18200001).lr16(
NAME([this] () {
u16 res = m_screen->vpos();
if (m_screen->vpos() >= 480)
res |= 0x400;
return res;
}
));
// 28000000: MEZ2 SEL, also connected to ymz chip select?
// 28010000: first 28C94 QUART (QRT1 SEL)
@ -207,7 +246,7 @@ void igt_gameking_state::igt_gameking_map(address_map &map)
}
// TODO: unknown value required, checked at "Cold powerup machine setup"
// comes from Xilinx?
// should really be just like above and be video related flags?
uint16_t igt_gameking_state::version_r()
{
return 0xf777;
@ -422,7 +461,7 @@ static INPUT_PORTS_START( igt_gameking )
INPUT_PORTS_END
// TODO: wrong decoding
// TODO: wrong decoding, gfxs inside have variable pitches (is this really decodable?)
static const gfx_layout igt_gameking_layout =
{
16,8,
@ -507,7 +546,7 @@ void igt_gameking_state::igt_ms72c(machine_config &config)
m_maincpu->set_addrmap(AS_PROGRAM, &igt_gameking_state::igt_ms72c_map);
// TODO: pinpoint enable/acknowledge
// clears $280201fc from there
// clears $280201fc from there, from SENET RTC?
// m_screen->screen_vblank().set_inputline(m_maincpu, I960_IRQ2);
}