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guab: hook up 4th ppi

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This commit is contained in:
Dirk Best 2016-12-02 03:32:56 +01:00
parent 5df36e5631
commit e44ca0abe6
1 changed files with 49 additions and 25 deletions
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74
src/mame/drivers/guab.cpp
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@ -64,7 +64,9 @@ public:
m_sn(*this, "snsnd"),
m_fdc(*this, "fdc"),
m_floppy(*this, "fdc:0"),
m_palette(*this, "palette") { }
m_palette(*this, "palette"),
m_sound_buffer(0), m_sound_latch(false)
{ }
EF9369_COLOR_UPDATE(ef9369_color_update);
DECLARE_WRITE16_MEMBER(tms34061_w);
@ -78,9 +80,10 @@ public:
DECLARE_WRITE8_MEMBER(output5_w);
DECLARE_WRITE8_MEMBER(output6_w);
DECLARE_READ8_MEMBER(sn76489_ready_r);
DECLARE_WRITE8_MEMBER(floppy_ctrl_w);
DECLARE_WRITE8_MEMBER(sn76489_buffer_w);
DECLARE_WRITE8_MEMBER(system_w);
DECLARE_READ8_MEMBER(watchdog_r);
DECLARE_WRITE8_MEMBER(watchdog_w);
DECLARE_WRITE8_MEMBER(unknown_w);
DECLARE_INPUT_CHANGED_MEMBER(coin_inserted);
@ -96,6 +99,9 @@ private:
required_device<wd1773_t> m_fdc;
required_device<floppy_connector> m_floppy;
required_device<palette_device> m_palette;
uint8_t m_sound_buffer;
bool m_sound_latch;
};
@ -109,10 +115,7 @@ static ADDRESS_MAP_START( guab_map, AS_PROGRAM, 16, guab_state )
AM_RANGE(0x0c0000, 0x0c0007) AM_DEVREADWRITE8("i8255_1", i8255_device, read, write, 0x00ff)
AM_RANGE(0x0c0020, 0x0c0027) AM_DEVREADWRITE8("i8255_2", i8255_device, read, write, 0x00ff)
AM_RANGE(0x0c0040, 0x0c0047) AM_DEVREADWRITE8("i8255_3", i8255_device, read, write, 0x00ff)
AM_RANGE(0x0c0060, 0x0c0061) AM_READ8(sn76489_ready_r, 0x00ff) AM_DEVWRITE8("snsnd", sn76489_device, write, 0x00ff)
AM_RANGE(0x0c0062, 0x0c0063) AM_WRITE8(floppy_ctrl_w, 0x00ff)
AM_RANGE(0x0c0064, 0x0c0065) AM_WRITE8(watchdog_w, 0x00ff)
AM_RANGE(0x0c0066, 0x0c0067) AM_WRITE8(unknown_w, 0x00ff)
AM_RANGE(0x0c0060, 0x0c0067) AM_DEVREADWRITE8("i8255_4", i8255_device, read, write, 0x00ff)
AM_RANGE(0x0c0080, 0x0c0081) AM_DEVREADWRITE8("acia6850_1", acia6850_device, status_r, control_w, 0x00ff)
AM_RANGE(0x0c0082, 0x0c0083) AM_DEVREADWRITE8("acia6850_1", acia6850_device, data_r, data_w, 0x00ff)
AM_RANGE(0x0c00a0, 0x0c00a1) AM_DEVREADWRITE8("acia6850_2", acia6850_device, status_r, control_w, 0x00ff)
@ -285,19 +288,36 @@ void guab_state::machine_start()
m_fdc->set_floppy(m_floppy->get_device());
}
WRITE8_MEMBER( guab_state::watchdog_w )
READ8_MEMBER( guab_state::watchdog_r )
{
// nibbles only
// reads from the port, then writes the sequence
// b 3 1 5 d a 2 0 4 0 8 b 3 1 5 d a 2 0 4 0 8
// after that it just continues writing f to it
// only read after writing the sequence below
return 0xff;
}
WRITE8_MEMBER( guab_state::unknown_w )
WRITE8_MEMBER( guab_state::watchdog_w )
{
// unknown
// at startup, 0x88 or 0x98 is written here
// while the game is running only 0x88
// watchdog?
// writes b 3 1 5 d a 2 0 4 0 8 b 3 1 5 d a 2 0 4 0 8
// then later toggles between 0 and f
}
WRITE8_MEMBER( guab_state::system_w )
{
// bit 0, sound latch
if (m_sound_latch != bool(BIT(data, 0)))
{
// falling edge
if (!m_sound_latch)
m_sn->write(m_sound_buffer);
m_sound_latch = bool(BIT(data, 0));
}
// bit 3, floppy drive side select
m_floppy->get_device()->ss_w(BIT(data, 3));
// one of those bits will probably control the motor, we just let it run all the time for now
m_floppy->get_device()->mon_w(0);
}
@ -397,23 +417,20 @@ WRITE8_MEMBER( guab_state::output6_w )
READ8_MEMBER( guab_state::sn76489_ready_r )
{
// bit 7 connected to sn76489 ready output (0 = ready)
// bit 7 connected to sn76489 ready output (0 = ready)^
return ~(m_sn->ready_r() << 7);
}
WRITE8_MEMBER( guab_state::sn76489_buffer_w )
{
m_sound_buffer = data;
}
//**************************************************************************
// FLOPPY DRIVE
//**************************************************************************
WRITE8_MEMBER( guab_state::floppy_ctrl_w )
{
m_floppy->get_device()->ss_w(BIT(data, 3));
// one of those bits will probably control the motor, we just let it run all the time for now
m_floppy->get_device()->mon_w(0);
}
FLOPPY_FORMATS_MEMBER( guab_state::floppy_formats )
FLOPPY_GUAB_FORMAT
FLOPPY_FORMATS_END
@ -477,6 +494,13 @@ static MACHINE_CONFIG_START( guab, guab_state )
MCFG_I8255_OUT_PORTB_CB(WRITE8(guab_state, output5_w))
MCFG_I8255_OUT_PORTC_CB(WRITE8(guab_state, output6_w))
MCFG_DEVICE_ADD("i8255_4", I8255, 0)
MCFG_I8255_IN_PORTA_CB(READ8(guab_state, sn76489_ready_r))
MCFG_I8255_OUT_PORTA_CB(WRITE8(guab_state, sn76489_buffer_w))
MCFG_I8255_OUT_PORTB_CB(WRITE8(guab_state, system_w))
MCFG_I8255_IN_PORTC_CB(READ8(guab_state, watchdog_r))
MCFG_I8255_OUT_PORTC_CB(WRITE8(guab_state, watchdog_w))
MCFG_DEVICE_ADD("acia6850_1", ACIA6850, 0)
MCFG_DEVICE_ADD("acia6850_2", ACIA6850, 0)