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octopus: hooked up RTC to the PPI (hopefully more or less correctly)

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This commit is contained in:
mahlemiut 2016-09-22 14:52:12 +12:00
parent 8ce8d4be72
commit e6ecdf0dea
1 changed files with 55 additions and 2 deletions
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57
src/mame/drivers/octopus.cpp
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@ -144,6 +144,7 @@ public:
m_floppy1(*this, "fdc:1"),
m_kb_uart(*this, "keyboard"),
m_pit(*this, "pit"),
m_ppi(*this, "ppi"),
m_speaker(*this, "speaker"),
m_z80_bankdev(*this, "z80_bank"),
m_ram(*this, "main_ram"),
@ -177,6 +178,8 @@ public:
DECLARE_READ8_MEMBER(z80_io_r);
DECLARE_WRITE8_MEMBER(z80_io_w);
IRQ_CALLBACK_MEMBER(x86_irq_cb);
DECLARE_READ8_MEMBER(rtc_r);
DECLARE_WRITE8_MEMBER(rtc_w);
DECLARE_WRITE_LINE_MEMBER(spk_w);
DECLARE_WRITE_LINE_MEMBER(spk_freq_w);
@ -215,6 +218,7 @@ private:
required_device<floppy_connector> m_floppy1;
required_device<i8251_device> m_kb_uart;
required_device<pit8253_device> m_pit;
required_device<i8255_device> m_ppi;
required_device<speaker_sound_device> m_speaker;
required_device<address_map_bank_device> m_z80_bankdev;
required_device<ram_device> m_ram;
@ -231,6 +235,9 @@ private:
bool m_beep_active;
bool m_speaker_level;
bool m_z80_active;
bool m_rtc_address;
bool m_rtc_data;
UINT8 m_prev_cntl;
emu_timer* m_timer_beep;
};
@ -420,7 +427,36 @@ WRITE8_MEMBER(octopus_state::z80_io_w)
m_z80_active = false;
}
// RTC data and I/O - PPI port A
// bits 0-3 of RTC/FDC control go to control lines of the MC146818
// The technical manual does not mention what is connected to each bit
// This is an educated guess, based on the BIOS code
// bit 0 = ? (Pulsed low after writing to an RTC register)
// bit 1 = PPI Port A strobe?
// bit 2 = Data strobe?
// bit 3 = Address strobe?
READ8_MEMBER(octopus_state::rtc_r)
{
UINT8 ret = 0xff;
if(m_rtc_data)
ret = m_rtc->read(space,1);
else if(m_rtc_address)
ret = m_rtc->read(space,0);
return ret;
}
WRITE8_MEMBER(octopus_state::rtc_w)
{
if(m_rtc_data)
m_rtc->write(space,1,data);
else if(m_rtc_address)
m_rtc->write(space,0,data);
}
// RTC/FDC control - PPI port B
// bits0-3: RTC control lines
// bit4-5: write precomp.
// bit6-7: drive select
READ8_MEMBER(octopus_state::cntl_r)
@ -431,6 +467,21 @@ READ8_MEMBER(octopus_state::cntl_r)
WRITE8_MEMBER(octopus_state::cntl_w)
{
m_cntl = data;
if((m_cntl & 0x08) && !(m_prev_cntl & 0x08))
{
m_rtc_address = true;
m_rtc_data = false;
logerror("Address strobe!\n");
}
if((data & 0x04) && !(m_prev_cntl & 0x04))
{
m_rtc_address = false;
m_rtc_data = true;
logerror("Data strobe!\n");
}
m_ppi->pc4_w(data & 0x02);
m_prev_cntl = m_cntl;
m_current_drive = (data & 0xc0) >> 6;
switch(m_current_drive)
{
@ -567,6 +618,8 @@ void octopus_state::machine_reset()
m_z80_active = false;
m_current_dma = -1;
m_current_drive = 0;
m_rtc_address = true;
m_rtc_data = false;
membank("main_ram_bank")->set_base(m_ram->pointer());
}
@ -651,10 +704,10 @@ static MACHINE_CONFIG_START( octopus, octopus_state )
// RTC (MC146818 via i8255 PPI) TODO: hook up RTC to PPI
MCFG_DEVICE_ADD("ppi", I8255, 0)
MCFG_I8255_IN_PORTA_CB(NOOP)
MCFG_I8255_IN_PORTA_CB(READ8(octopus_state,rtc_r))
MCFG_I8255_IN_PORTB_CB(READ8(octopus_state,cntl_r))
MCFG_I8255_IN_PORTC_CB(READ8(octopus_state,gpo_r))
MCFG_I8255_OUT_PORTA_CB(NOOP)
MCFG_I8255_OUT_PORTA_CB(WRITE8(octopus_state,rtc_w))
MCFG_I8255_OUT_PORTB_CB(WRITE8(octopus_state,cntl_w))
MCFG_I8255_OUT_PORTC_CB(WRITE8(octopus_state,gpo_w))
MCFG_MC146818_ADD("rtc", XTAL_32_768kHz)