/
littlerb.cpp
342 lines (286 loc) · 12.7 KB
/
littlerb.cpp
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// license:BSD-3-Clause
// copyright-holders:Pierpaolo Prazzoli, David Haywood
/*
Little Robin, (c)1994 TCH
driver by:
Pierpaolo Prazzoli
David Haywood
Notes:
How big are the actual framebuffers? Are both also double buffered?
Sound pitch is directly correlated with irqs, scanline timings and pixel clock,
so it's surely not 100% correct. Sound sample playbacks looks fine at current time tho.
------
LITTLE ROBIN TCH S.A.
+---------------------------------------------+
|TDA2003 U41_RAM 44C256|
|VR1 U48 U40_RAM 44C256|
| 6.000MHz U36_RAM 44C256|
| U35_RAM 44C256|
| Bt478 |
|J GAL22V10 |
|A GAL20V8 |
|M TMS34010 |
|M 555N 40.000MHz|
|A GAL22V10 |
| 84256A-70 84256A-70 |
| TCH_1.U53 TCH_2.U29 |
| 16.000MHz |
| TCH_4.U32 |
| DSW1 DSW2 MC68000P12 TCH_3.U26 |
|---------------------------------------------+
CPU: MC68000 series @ 16.000MHz/2 (known to use 10MHz or 12MHz parts)
OSC: 40.000MHz, 16.000MHz & 6.000MHz
Graphics: TMS34010 (surface scratched, stamped B)
RAM: 2 Fujitsu 84256A-70L 32K SRAM
4 Samsung KM44C256CP-10 256K x 4bit CMOS DRAM
U35, U36, U40 & U41 unknown ZIP style RAM
DSW: 2 8-switch dipswitch banks
Other: TDA2003 10Watt Amp
ST 555N General Purpose Single Bipolar Timer
Bt478KPJ35 Brooktree 80Mhz 265-Word Color Palette PS/2 RAMDAC
VR1 volume resistor pot
U48 is an unknown surface scratched socketed QFP68 part stamped A
Dip sw.1
--------
| Coin 1 | Coin 2 |
1 2 3 4 5 6 7 8 Coin Play
---------------------------------------------------
Coins - - - - - - 1 4
+ - - + - - 1 3
- + - - + - 1 2
+ + - + + - 1 1
- - + - - + 2 1
+ - + + - + 3 1
- + + - + + 4 1
+ + + + + + 5 1
Player - - 2
+ - 3
- + 4
+ + 5
Dip sw.2
-------- 1 2 3 4 5 6 7 8
-----------------------------------------------------------
Demo Sound - Yes
+ No
Mode - Test Mode
+ Game Mode
Difficulty - - - 0 (Easy)
+ - - 1
- + - 2 (Normal)
+ + - 3
- - + 4
+ - + 5
- + + 6
+ + + 7 (Hardest)
Bonus - - Every 150000
+ - Every 200000
- + Every 300000
+ + No Bonus
*/
#include "emu.h"
#include "inder_vid.h"
#include "cpu/m68000/m68000.h"
#include "machine/timer.h"
#include "sound/dac.h"
#include "speaker.h"
namespace {
#define littlerb_printf logerror
#define littlerb_alt_printf logerror
class littlerb_state : public driver_device
{
public:
littlerb_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_indervid(*this, "inder_vid"),
m_sample_rom(*this, "samples"),
m_ldac(*this, "ldac"),
m_rdac(*this, "rdac"),
m_soundframe(0)
{
}
void littlerb(machine_config &config);
void init_littlerb();
DECLARE_CUSTOM_INPUT_MEMBER(frame_step_r);
protected:
virtual void machine_start() override;
private:
required_device<cpu_device> m_maincpu;
required_device<inder_vid_device> m_indervid;
required_region_ptr<uint8_t> m_sample_rom;
required_device<dac_byte_interface> m_ldac;
required_device<dac_byte_interface> m_rdac;
uint8_t m_sound_index_l = 0, m_sound_index_r = 0;
uint16_t m_sound_pointer_l = 0, m_sound_pointer_r = 0;
int m_soundframe;
void l_sound_w(uint16_t data);
void r_sound_w(uint16_t data);
uint8_t sound_data_shift();
TIMER_DEVICE_CALLBACK_MEMBER(sound_step_cb);
TIMER_DEVICE_CALLBACK_MEMBER(sound_cb);
void main(address_map &map);
};
void littlerb_state::machine_start()
{
save_item(NAME(m_sound_index_l));
save_item(NAME(m_sound_index_r));
save_item(NAME(m_sound_pointer_l));
save_item(NAME(m_sound_pointer_r));
save_item(NAME(m_soundframe));
}
// could be slightly different (timing wise, directly related to the irqs), but certainly they smoked some bad pot for this messy way ...
uint8_t littlerb_state::sound_data_shift()
{
return ((m_soundframe % 16) == 0) ? 8 : 0;
}
// l is SFX, r is BGM (they don't seem to share the same data ROM)
void littlerb_state::l_sound_w(uint16_t data)
{
m_sound_index_l = (data >> sound_data_shift()) & 0xff;
m_sound_pointer_l = 0;
//popmessage("%04x %04x",m_sound_index_l,m_sound_index_r);
}
void littlerb_state::r_sound_w(uint16_t data)
{
m_sound_index_r = (data >> sound_data_shift()) & 0xff;
m_sound_pointer_r = 0;
//popmessage("%04x %04x",m_sound_index_l,m_sound_index_r);
}
void littlerb_state::main(address_map &map)
{
map(0x000008, 0x000017).nopw();
map(0x000020, 0x00002f).nopw();
map(0x000070, 0x000073).nopw();
map(0x060004, 0x060007).nopw();
map(0x000000, 0x0fffff).rom();
map(0x200000, 0x203fff).ram(); // main ram?
map(0x700000, 0x700007).rw("inder_vid:tms", FUNC(tms34010_device::host_r), FUNC(tms34010_device::host_w));
map(0x740000, 0x740001).w(FUNC(littlerb_state::l_sound_w));
map(0x760000, 0x760001).w(FUNC(littlerb_state::r_sound_w));
map(0x780000, 0x780001).nopw(); // generic outputs
map(0x7c0000, 0x7c0001).portr("DSW");
map(0x7e0000, 0x7e0001).portr("P1");
map(0x7e0002, 0x7e0003).portr("P2");
}
// guess according to DASM code and checking the gameplay speed, could be different
CUSTOM_INPUT_MEMBER(littlerb_state::frame_step_r)
{
uint32_t ret = m_soundframe;
return (ret) & 7;
}
static INPUT_PORTS_START( littlerb )
PORT_START("DSW") // 16bit
PORT_DIPNAME( 0x0003, 0x0001, DEF_STR( Lives ) ) PORT_DIPLOCATION("SW1:8,7")
PORT_DIPSETTING( 0x0003, "2" )
PORT_DIPSETTING( 0x0001, "3" )
PORT_DIPSETTING( 0x0002, "4" )
PORT_DIPSETTING( 0x0000, "5" )
PORT_DIPNAME( 0x001c, 0x0004, DEF_STR( Coin_B ) ) PORT_DIPLOCATION("SW1:6,5,4")
PORT_DIPSETTING( 0x0000, DEF_STR( 5C_1C ) )
PORT_DIPSETTING( 0x0010, DEF_STR( 4C_1C ) )
PORT_DIPSETTING( 0x0008, DEF_STR( 3C_1C ) )
PORT_DIPSETTING( 0x0018, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x0004, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x0014, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x000c, DEF_STR( 1C_3C ) )
PORT_DIPSETTING( 0x001c, DEF_STR( 1C_4C ) )
PORT_DIPNAME( 0x00e0, 0x0020, DEF_STR( Coin_A ) ) PORT_DIPLOCATION("SW1:3,2,1")
PORT_DIPSETTING( 0x0000, DEF_STR( 5C_1C ) )
PORT_DIPSETTING( 0x0080, DEF_STR( 4C_1C ) )
PORT_DIPSETTING( 0x0040, DEF_STR( 3C_1C ) )
PORT_DIPSETTING( 0x00c0, DEF_STR( 2C_1C ) )
PORT_DIPSETTING( 0x0020, DEF_STR( 1C_1C ) )
PORT_DIPSETTING( 0x00a0, DEF_STR( 1C_2C ) )
PORT_DIPSETTING( 0x0060, DEF_STR( 1C_3C ) )
PORT_DIPSETTING( 0x00e0, DEF_STR( 1C_4C ) )
PORT_DIPNAME( 0x0100, 0x0100, DEF_STR( Unknown ) ) PORT_DIPLOCATION("SW2:8")
PORT_DIPSETTING( 0x0100, DEF_STR( Off ) )
PORT_DIPSETTING( 0x0000, DEF_STR( On ) )
PORT_DIPNAME( 0x0600, 0x0600, DEF_STR( Bonus_Life ) ) PORT_DIPLOCATION("SW2:7,6")
PORT_DIPSETTING( 0x0600, "Every 150,000" )
PORT_DIPSETTING( 0x0200, "Every 200,000" )
PORT_DIPSETTING( 0x0400, "Every 300,000" )
PORT_DIPSETTING( 0x0000, DEF_STR( None ) )
PORT_DIPNAME( 0x3800, 0x2800, DEF_STR( Difficulty ) ) PORT_DIPLOCATION("SW2:5,4,3")
PORT_DIPSETTING( 0x3800, DEF_STR( Easy ) )
PORT_DIPSETTING( 0x1800, DEF_STR( Medium_Easy ) )
PORT_DIPSETTING( 0x2800, DEF_STR( Normal ) )
PORT_DIPSETTING( 0x0800, DEF_STR( Medium_Hard ) )
PORT_DIPSETTING( 0x3000, DEF_STR( Hard ) )
PORT_DIPSETTING( 0x1000, DEF_STR( Harder ) )
PORT_DIPSETTING( 0x2000, DEF_STR( Very_Hard ) )
PORT_DIPSETTING( 0x0000, DEF_STR( Hardest ) )
PORT_SERVICE_DIPLOC( 0x4000, IP_ACTIVE_LOW, "SW2:2" )
PORT_DIPNAME( 0x8000, 0x8000, DEF_STR( Demo_Sounds ) ) PORT_DIPLOCATION("SW2:1")
PORT_DIPSETTING( 0x0000, DEF_STR( Off ) )
PORT_DIPSETTING( 0x8000, DEF_STR( On ) )
PORT_START("P1") // 16bit
PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1)
PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1)
PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x0100, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x0200, IP_ACTIVE_LOW, IPT_START2 )
PORT_BIT( 0x0400, IP_ACTIVE_LOW, IPT_COIN1 )
PORT_BIT( 0x0800, IP_ACTIVE_LOW, IPT_COIN2 )
PORT_DIPNAME( 0x1000, 0x1000, "???" )
PORT_DIPSETTING( 0x1000, DEF_STR( Off ) )
PORT_DIPSETTING( 0x0000, DEF_STR( On ) )
PORT_BIT( 0xe000, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_CUSTOM_MEMBER(littlerb_state, frame_step_r)
PORT_START("P2") // 16bit
PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2)
PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2)
PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::sound_cb)
{
m_ldac->write(m_sample_rom[m_sound_pointer_l | (m_sound_index_l << 10) | 0x40000]);
m_rdac->write(m_sample_rom[m_sound_pointer_r | (m_sound_index_r << 10) | 0x00000]);
m_sound_pointer_l++;
m_sound_pointer_l&=0x3ff;
m_sound_pointer_r++;
m_sound_pointer_r&=0x3ff;
}
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::sound_step_cb)
{
m_soundframe++;
}
void littlerb_state::littlerb(machine_config &config)
{
M68000(config, m_maincpu, XTAL(16'000'000)/2); // 10MHz rated part, near 16Mhz XTAL
m_maincpu->set_addrmap(AS_PROGRAM, &littlerb_state::main);
INDER_VIDEO(config, m_indervid, 0); // XTAL(40'000'000)
// TODO: not accurate - driven by XTAL(6'000'000)?
TIMER(config, "step_timer").configure_periodic(FUNC(littlerb_state::sound_step_cb), attotime::from_hz(7500/150));
TIMER(config, "sound_timer").configure_periodic(FUNC(littlerb_state::sound_cb), attotime::from_hz(7500));
SPEAKER(config, "lspeaker").front_left();
SPEAKER(config, "rspeaker").front_right();
DAC_8BIT_R2R(config, m_ldac, 0).add_route(ALL_OUTPUTS, "lspeaker", 0.5); // unknown DAC
DAC_8BIT_R2R(config, m_rdac, 0).add_route(ALL_OUTPUTS, "rspeaker", 0.5); // unknown DAC
}
ROM_START( littlerb )
ROM_REGION( 0x100000, "maincpu", 0 ) // 68000 Code
ROM_LOAD16_BYTE( "tch_1.u53", 0x00001, 0x80000, CRC(172fbc13) SHA1(cd165ca0d0546e2634cf182dc98004cbfb02cf9f) )
ROM_LOAD16_BYTE( "tch_2.u29", 0x00000, 0x80000, CRC(b2fb1d61) SHA1(9a9d7176c241928d07af651e5f7f21d4f019701d) )
ROM_REGION( 0x80000, "samples", 0 )
ROM_LOAD( "tch_3.u26", 0x40000, 0x40000, CRC(f193c5b6) SHA1(95548a40e2b5064c558b36cabbf507d23678b1b2) )
ROM_LOAD( "tch_4.u32", 0x00000, 0x40000, CRC(d6b81583) SHA1(b7a63d18a41ccac4d3db9211de0b0cdbc914317a) )
ROM_END
void littlerb_state::init_littlerb()
{
/* various scenes flicker to the point of graphics being invisible (eg. the map screen at the very start of a game)
unless you overclock the TMS34010 to 120%, possible timing bug in the core? this is a hack */
m_indervid->subdevice<cpu_device>("tms")->set_clock_scale(1.2f);
}
} // anonymous namespace
GAME( 1994, littlerb, 0, littlerb, littlerb, littlerb_state, init_littlerb, ROT0, "TCH", "Little Robin", MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )