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irem/m119.cpp: fix CPU endianness, add initial observations

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This commit is contained in:
angelosa 2022-10-05 23:42:20 +02:00
parent 9e58372c7d
commit 2e341912d5
1 changed files with 20 additions and 5 deletions
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25
src/mame/irem/m119.cpp
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@ -42,6 +42,7 @@ class m119_state : public driver_device
public:
m119_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
{
}
@ -50,7 +51,9 @@ public:
private:
uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void prg_map(address_map &map);
void program_map(address_map &map);
required_device<sh3_device> m_maincpu;
};
uint32_t m119_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
@ -58,9 +61,20 @@ uint32_t m119_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap,
return 0;
}
void m119_state::prg_map(address_map &map)
void m119_state::program_map(address_map &map)
{
map(0x00000000, 0x0007ffff).rom().region("maincpu", 0);
map(0x00400000, 0x0040ffff).ram(); // stack
// map(0x04000080, 0x04000083) address/data pairs, likely YMZ
// map(0x1000be01, 0x1000c1ff) filled as byte area
// map(0x1000c000, 0x1000ffff) ^
// 0x18000096-0x18000097 writes before accessing byte area, banked view?
// 0x180000b5 always 0xaa, paired with WTCSR $5a
// 0x180000b4 r/w at PC=0x12b2 onward,
// then loops expecting an external event filling work RAM buffer $401110 PC=12e6,
// presumably for a thread dispatcher (observe R11 afterwards)
}
static INPUT_PORTS_START( m119 )
@ -85,13 +99,14 @@ INPUT_PORTS_END
void m119_state::m119(machine_config &config)
{
// basic machine hardware
sh3be_device &maincpu(SH3BE(config, "maincpu", 60'000'000)); // HD6417708S, according to the datasheet operation frequency is 60 MHz. TODO: verify endianness
maincpu.set_addrmap(AS_PROGRAM, &m119_state::prg_map);
SH3LE(config, m_maincpu, 60'000'000); // HD6417708S, according to the datasheet operation frequency is 60 MHz.
m_maincpu->set_addrmap(AS_PROGRAM, &m119_state::program_map);
// m_maincpu->set_vblank_int("screen", FUNC(m119_state::irq2_line_hold));
// all wrong
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_refresh_hz(60);
screen.set_vblank_time(ATTOSECONDS_IN_USEC(0));
screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500));
screen.set_size(64*8, 32*8);
screen.set_visarea_full();
screen.set_screen_update(FUNC(m119_state::screen_update));