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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Namco 54XX
This custom chip is a Fujitsu MB8844 MCU programmed to act as a noise
generator. It is used for explosions, the shoot sound in Bosconian,
and the tire screech sound in Pole Position.
CMD = command from main CPU
OUTn = sound outputs (3 channels)
The chip reads the command when the /IRQ is pulled down.
+------+
EX|1 28|Vcc
X|2 27|K3 (CMD7)
/RESET|3 26|K2 (CMD6)
(OUT0.0) O0|4 25|K1 (CMD5)
(OUT0.1) O1|5 24|K0 (CMD4)
(OUT0.2) O2|6 23|R10/IRQ
(OUT0.3) O3|7 22|R9/TC
(OUT1.0) O4|8 21|R8
(OUT1.1) O5|9 20|R7 (OUT2.3)
(OUT1.2) O6|10 19|R6 (OUT2.2)
(OUT1.3) O7|11 18|R5 (OUT2.1)
(CMD0) R0|12 17|R4 (OUT2.0)
(CMD1) R1|13 16|R3 (CMD3)
GND|14 15|R2 (CMD2)
+------+
[1] The RNG that drives the type A output is output on pin 21, and
the one that drives the type B output is output on pin 22, but those
pins are not connected on the board.
The command format is very simple:
0x: nop
1x: play sound type A
2x: play sound type B
3x: set parameters (type A) (followed by 4 bytes)
4x: set parameters (type B) (followed by 4 bytes)
5x: play sound type C
6x: set parameters (type C) (followed by 5 bytes)
7x: set volume for sound type C to x
8x-Fx: nop
***************************************************************************/
#include "emu.h"
#include "namco54.h"
WRITE_LINE_MEMBER( namco_54xx_device::reset )
{
// The incoming signal is active low
m_cpu->set_input_line(INPUT_LINE_RESET, !state);
}
uint8_t namco_54xx_device::K_r()
{
return m_latched_cmd >> 4;
}
uint8_t namco_54xx_device::R0_r()
{
return m_latched_cmd & 0x0f;
}
void namco_54xx_device::O_w(uint8_t data)
{
uint8_t out = (data & 0x0f);
if (data & 0x10)
m_discrete->write(NAMCO_54XX_1_DATA(m_basenode), out);
else
m_discrete->write(NAMCO_54XX_0_DATA(m_basenode), out);
}
void namco_54xx_device::R1_w(uint8_t data)
{
uint8_t out = (data & 0x0f);
m_discrete->write(NAMCO_54XX_2_DATA(m_basenode), out);
}
void namco_54xx_device::write(uint8_t data)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(namco_54xx_device::write_sync),this), data);
}
TIMER_CALLBACK_MEMBER( namco_54xx_device::write_sync )
{
m_latched_cmd = param;
}
WRITE_LINE_MEMBER( namco_54xx_device::chip_select )
{
m_cpu->set_input_line(0, state);
}
/***************************************************************************
DEVICE INTERFACE
***************************************************************************/
ROM_START( namco_54xx )
ROM_REGION( 0x400, "mcu", 0 )
ROM_LOAD( "54xx.bin", 0x0000, 0x0400, CRC(ee7357e0) SHA1(01bdf984a49e8d0cc8761b2cc162fd6434d5afbe) )
ROM_END
DEFINE_DEVICE_TYPE(NAMCO_54XX, namco_54xx_device, "namco54", "Namco 54xx")
namco_54xx_device::namco_54xx_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, NAMCO_54XX, tag, owner, clock),
m_cpu(*this, "mcu"),
m_discrete(*this, finder_base::DUMMY_TAG),
m_basenode(0),
m_latched_cmd(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void namco_54xx_device::device_start()
{
save_item(NAME(m_latched_cmd));
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void namco_54xx_device::device_add_mconfig(machine_config &config)
{
MB8844(config, m_cpu, DERIVED_CLOCK(1,1)); /* parent clock, internally divided by 6 */
m_cpu->read_k().set(FUNC(namco_54xx_device::K_r));
m_cpu->write_o().set(FUNC(namco_54xx_device::O_w));
m_cpu->read_r<0>().set(FUNC(namco_54xx_device::R0_r));
m_cpu->write_r<1>().set(FUNC(namco_54xx_device::R1_w));
}
//-------------------------------------------------
// device_rom_region - return a pointer to the
// the device's ROM definitions
//-------------------------------------------------
const tiny_rom_entry *namco_54xx_device::device_rom_region() const
{
return ROM_NAME(namco_54xx );
}
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