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// license:BSD-3-Clause
// copyright-holders:hap
/***************************************************************************
Roland TB-303 Bass Line, 1982, designed by Tadao Kikumoto
* NEC uCOM-43 MCU, labeled D650C 133
* 3*uPD444C 1024x4 Static CMOS SRAM
* board is packed with discrete components
x
***************************************************************************/
#include "emu.h"
#include "cpu/ucom4/ucom4.h"
#include "tb303.lh"
class tb303_state : public driver_device
{
public:
tb303_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_t3_off_timer(*this, "t3_off")
{ }
required_device<cpu_device> m_maincpu;
required_device<timer_device> m_t3_off_timer;
TIMER_DEVICE_CALLBACK_MEMBER(t3_clock);
TIMER_DEVICE_CALLBACK_MEMBER(t3_off);
virtual void machine_start();
};
// T2 to MCU CLK: LC circuit, stable sine wave, 2.2us interval
#define TB303_T2_CLOCK_HZ 454545 /* in hz */
// T3 to MCU _INT: square wave, 1.8ms interval, short duty cycle
#define TB303_T3_CLOCK attotime::from_usec(1800)
#define TB303_T3_OFF (TB303_T3_CLOCK / 8)
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::t3_off)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
}
TIMER_DEVICE_CALLBACK_MEMBER(tb303_state::t3_clock)
{
m_maincpu->set_input_line(0, ASSERT_LINE);
m_t3_off_timer->adjust(TB303_T3_OFF);
}
static INPUT_PORTS_START( tb303 )
INPUT_PORTS_END
/***************************************************************************
Machine Config
***************************************************************************/
void tb303_state::machine_start()
{
}
static MACHINE_CONFIG_START( tb303, tb303_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", NEC_D650, TB303_T2_CLOCK_HZ)
MCFG_TIMER_DRIVER_ADD_PERIODIC("t3_clock", tb303_state, t3_clock, TB303_T3_CLOCK)
MCFG_TIMER_START_DELAY(TB303_T3_CLOCK)
MCFG_TIMER_DRIVER_ADD("t3_off", tb303_state, t3_off)
MCFG_DEFAULT_LAYOUT(layout_tb303)
/* no video! */
/* sound hardware */
// discrete...
MACHINE_CONFIG_END
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START( tb303 )
ROM_REGION( 0x0800, "maincpu", 0 )
ROM_LOAD( "d650c-133.ic8", 0x0000, 0x0800, CRC(dd2f26ae) SHA1(7f5e37f38d970219dc9e5d49a20dc5335a5c0b30) )
ROM_END
CONS( 1982, tb303, 0, 0, tb303, tb303, driver_device, 0, "Roland", "TB-303", GAME_NOT_WORKING | GAME_NO_SOUND | GAME_SUPPORTS_SAVE )
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