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megasys1.cpp: comment update for the p47b sound system (nw)

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This commit is contained in:
Ivan Vangelista 2019-10-12 15:21:36 +02:00
parent 499310b605
commit df53d0ef17
2 changed files with 21 additions and 6 deletions
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25
src/mame/drivers/megasys1.cpp
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@ -545,13 +545,23 @@ void megasys1_state::p47b_sound_map(address_map &map)
{
map(0x000000, 0x01ffff).rom();
map(0x040000, 0x040001).r(m_soundlatch[0], FUNC(generic_latch_16_device::read));
map(0x060000, 0x060001).w(m_soundlatch[1], FUNC(generic_latch_16_device::write)); // to main cpu
map(0x060000, 0x060001).w(m_soundlatch[1], FUNC(generic_latch_16_device::write)); // to main cpu?
map(0x080000, 0x080003).rw("ymsnd", FUNC(ym2203_device::read), FUNC(ym2203_device::write)).umask16(0x00ff);
map(0x0a0000, 0x0a0003).noprw(); // OKI1 on the original
map(0x0c0000, 0x0c0003).noprw(); // OKI2 on the original
map(0x0e0000, 0x0fffff).ram();
}
void megasys1_state::p47b_extracpu_prg_map(address_map &map) // TODO
{
map(0x0000, 0xffff).rom();
}
void megasys1_state::p47b_extracpu_io_map(address_map &map)
{
map.global_mask(0xff);
}
/***************************************************************************
[ Sound CPU - System B / C ]
***************************************************************************/
@ -1773,10 +1783,13 @@ void megasys1_state::p47b(machine_config &config)
subdevice<ym2203_device>("ymsnd")->set_clock(7.2_MHz_XTAL / 2);
// what's this for? SFX?
//z80_device &extracpu(Z80(config, "extracpu", 7.2_MHz_XTAL / 2)); // divisor not verified
//extracpu.set_addrmap(AS_PROGRAM, &megasys1_state::p47b_extracpu_prg_map);
//extracpu.set_addrmap(AS_IO, &megasys1_state::p47b_extracpu_io_map);
// probably for driving the OKI M5205
z80_device &extracpu(Z80(config, "extracpu", 7.2_MHz_XTAL / 2)); // divisor not verified
extracpu.set_periodic_int(FUNC(megasys1_state::irq0_line_hold), attotime::from_hz(4*56));
extracpu.set_addrmap(AS_PROGRAM, &megasys1_state::p47b_extracpu_prg_map);
extracpu.set_addrmap(AS_IO, &megasys1_state::p47b_extracpu_io_map);
// OKI M5205
}
void megasys1_state::system_B(machine_config &config)
@ -3590,7 +3603,7 @@ ROM_START( p47je )
ROM_LOAD( "p-47.14m", 0x0000, 0x0200, CRC(1d877538) SHA1(a5be0dc65dcfc36fbba10d1fddbe155e24b6122f) )
ROM_END
ROM_START( p47b ) // very similar to original hardware but for the sound system (only a YM2203 with a Y3014B DAC with unpopulated spaces for another pair) and an extra Z80 (purpose unknown)
ROM_START( p47b ) // very similar to original hardware but for the sound system (a YM2203 with a Y3014B DAC with unpopulated spaces for another pair + an OKI M5205) and an extra Z80
ROM_REGION( 0x60000, "maincpu", 0 ) /* Main CPU Code, identical to p47 set but with smaller ROMs */
ROM_LOAD16_BYTE( "12.bin", 0x000000, 0x010000, CRC(cc81abd8) SHA1(223d205ee5120d16b997b0788fcb81c0de52da04) )
ROM_LOAD16_BYTE( "13.bin", 0x020000, 0x010000, CRC(f3ea8a3e) SHA1(b2ea6661f7a3653ac6d92e07176546a41178eaff) )

2
src/mame/includes/megasys1.h
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@ -192,6 +192,8 @@ private:
void stdragona_gfx_unmangle(const char *region);
void kickoffb_sound_map(address_map &map);
void p47b_sound_map(address_map &map);
void p47b_extracpu_prg_map(address_map &map);
void p47b_extracpu_io_map(address_map &map);
void megasys1A_map(address_map &map);
void megasys1A_sound_map(address_map &map);
void megasys1A_jitsupro_sound_map(address_map &map);