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sanyo/mbc200.cpp: Mix PPI sound outputs for system speaker. (#11123)

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Each CPU uses a PPI output line for sound output, which are summed and AC-coupled to the output amplifier.
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Stefano 2023-04-19 20:10:17 +02:00 committed by GitHub
parent b35ba6b31d
commit d26645c531
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 9 deletions
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23
src/mame/sanyo/mbc200.cpp
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@ -52,7 +52,6 @@ TODO:
#include "machine/i8255.h"
#include "machine/keyboard.h"
#include "machine/wd_fdc.h"
#include "sound/beep.h"
#include "sound/spkrdev.h"
#include "video/mc6845.h"
@ -76,7 +75,6 @@ public:
, m_maincpu(*this, "maincpu")
, m_rom(*this, "maincpu")
, m_ram(*this, "mainram")
, m_beep(*this, "beeper")
, m_speaker(*this, "speaker")
, m_fdc(*this, "fdc")
, m_floppy(*this, "fdc:%u", 0)
@ -103,6 +101,8 @@ private:
void sub_mem(address_map &map);
void sub_io(address_map &map);
u8 m_cpu_m_sound = 0U;
u8 m_cpu_s_sound = 0U;
u8 m_comm_latch = 0U;
u8 m_term_data = 0U;
required_device<mc6845_device> m_crtc;
@ -111,7 +111,6 @@ private:
required_device<cpu_device> m_maincpu;
required_region_ptr<u8> m_rom;
required_shared_ptr<u8> m_ram;
required_device<beep_device> m_beep;
required_device<speaker_sound_device> m_speaker;
required_device<mb8876_device> m_fdc;
required_device_array<floppy_connector, 4> m_floppy;
@ -125,16 +124,17 @@ void mbc200_state::main_mem(address_map &map)
void mbc200_state::p1_portc_w(u8 data)
{
m_speaker->level_w(BIT(data, 4)); // used by beep command in basic
m_cpu_s_sound = BIT(data, 4); // used by beep command in basic
m_speaker->level_w(m_cpu_m_sound + m_cpu_s_sound);
}
void mbc200_state::pm_porta_w(u8 data)
{
machine().scheduler().synchronize(); // force resync
//printf("A %02x %c\n",data,data);
m_comm_latch = data; // to slave CPU
}
// Writing to PPI port B ($E9). Being programmed for output, read operations will get the current value.
void mbc200_state::pm_portb_w(u8 data)
{
// The BIOS supports up tp 4 drives, (2 internal + 2 external)
@ -151,7 +151,9 @@ void mbc200_state::pm_portb_w(u8 data)
floppy->mon_w(0);
floppy->ss_w(BIT(data, 7));
}
m_beep->set_state(BIT(data, 1)); // key-click
m_cpu_m_sound = BIT(data, 1); // key-click
m_speaker->level_w(m_cpu_m_sound + m_cpu_s_sound);
}
void mbc200_state::main_io(address_map &map)
@ -256,6 +258,8 @@ void mbc200_state::kbd_put(u8 data)
void mbc200_state::machine_start()
{
save_item(NAME(m_cpu_m_sound));
save_item(NAME(m_cpu_s_sound));
save_item(NAME(m_comm_latch));
save_item(NAME(m_term_data));
}
@ -335,9 +339,10 @@ void mbc200_state::mbc200(machine_config &config)
// sound
SPEAKER(config, "mono").front_center();
BEEP(config, m_beep, 1000).add_route(ALL_OUTPUTS, "mono", 0.50); // frequency unknown
SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 0.50);
static const double speaker_levels[4] = { 0.0, 0.6, 1.0 };
SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 0.25);
m_speaker->set_levels(3, speaker_levels);
I8255(config, "ppi_1").out_pc_callback().set(FUNC(mbc200_state::p1_portc_w));
I8255(config, "ppi_2").in_pa_callback().set(FUNC(mbc200_state::p2_porta_r));