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oneshot.cpp: Correct clocks for CPU and Audio components. [caius, The Dumping Union]

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This commit is contained in:
braintro 2019-04-28 17:08:59 -05:00
parent 60bf6b5f17
commit 444a5a77fd
1 changed files with 13 additions and 5 deletions
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18
src/mame/drivers/oneshot.cpp
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@ -114,6 +114,14 @@ For One Shot One Kill:
chip appears to be unpopulated for One Shot One Kill.
The ROM board for One Shot One Kill has 8 additional logic chips along the front edge of the PCB
Clock measurements:
SCN68000C8N64: 12MHz
Z8400A PS: 3.375MHz (27MHz/8)
YM3812: 3.375MHz (27MHz/8)
OKI MSM6295: 1.25MHz, pin 7 is hard-wired to GROUND (5MHz/4)
VSYNC: 56.05Hz
H-SYNC: 15.06KHz
*/
#include "emu.h"
@ -440,15 +448,15 @@ void oneshot_state::machine_reset()
void oneshot_state::oneshot(machine_config &config)
{
/* basic machine hardware */
M68000(config, m_maincpu, 12_MHz_XTAL);
M68000(config, m_maincpu, 12_MHz_XTAL); // 12MHz - verified
m_maincpu->set_addrmap(AS_PROGRAM, &oneshot_state::mem_map);
m_maincpu->set_vblank_int("screen", FUNC(oneshot_state::irq4_line_hold));
Z80(config, "audiocpu", 5_MHz_XTAL).set_addrmap(AS_PROGRAM, &oneshot_state::sound_map); // Not verified
Z80(config, "audiocpu", 27_MHz_XTAL/8).set_addrmap(AS_PROGRAM, &oneshot_state::sound_map); // 3.375MHz - verified
/* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_refresh_hz(60);
screen.set_refresh_hz(56);
screen.set_vblank_time(ATTOSECONDS_IN_USEC(0));
screen.set_size(32*16, 32*16);
screen.set_visarea(0*16, 20*16-1, 0*16, 15*16-1);
@ -462,11 +470,11 @@ void oneshot_state::oneshot(machine_config &config)
GENERIC_LATCH_8(config, "soundlatch");
ym3812_device &ymsnd(YM3812(config, "ymsnd", 5_MHz_XTAL/2)); // 2.5MHz or 3MHz (12MHz/4) - clock frequency not verified
ym3812_device &ymsnd(YM3812(config, "ymsnd", 27_MHz_XTAL/8)); // 3.375MHz - verified
ymsnd.irq_handler().set_inputline("audiocpu", 0);
ymsnd.add_route(ALL_OUTPUTS, "mono", 1.0);
OKIM6295(config, m_oki, 5_MHz_XTAL/4, okim6295_device::PIN7_HIGH); // 1.25MHz??? - clock frequency & pin 7 not verified
OKIM6295(config, m_oki, 5_MHz_XTAL/4, okim6295_device::PIN7_LOW); // 1.25MHz - verified, pin 7 is hard-wired to GROUND
m_oki->add_route(ALL_OUTPUTS, "mono", 1.0);
}