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smpc.cpp: simulate SETTIME bit behaviour if an invalid NVRAM data is found for Sega Saturn like original HW does. [Angelo Salese]

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* Now all Sega Saturn romsets calls the BIOS setup if NVRAM is uninitialized. This is intended behaviour and sets up proper defaults like Japanese language for saturnjp set.
This commit is contained in:
angelosa 2017-10-05 06:15:16 +02:00
parent 9628bda4fb
commit 5d6fcb0d8d
3 changed files with 18 additions and 16 deletions
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22
src/devices/machine/smpc.cpp
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@ -14,7 +14,8 @@ TODO:
- fix intback issue with inputs (according to the docs, it should fall in between
VBLANK-IN and OUT, for obvious reasons);
- clean-ups;
- RTC device (unknown type, handled here for convenience)
- RTC subdevice (unknown type, handled here for convenience);
- Does ST-V even has a battery backed NVRAM?
Notes:
SMPC NVRAM contents:
@ -204,7 +205,7 @@ smpc_hle_device::smpc_hle_device(const machine_config &mconfig, const char *tag,
: device_t(mconfig, SMPC_HLE, tag, owner, clock),
device_memory_interface(mconfig, *this),
m_space_config("regs", ENDIANNESS_LITTLE, 8, 7, 0, nullptr, *ADDRESS_MAP_NAME(smpc_regs)),
m_smpc_nv(*this, "smpc_nv"),
m_mini_nvram(*this, "nvram"),
m_mshres(*this),
m_mshnmi(*this),
m_sshres(*this),
@ -247,7 +248,7 @@ void smpc_hle_device::static_set_control_port_tags(device_t &device, const char
//-------------------------------------------------
MACHINE_CONFIG_MEMBER(smpc_hle_device::device_add_mconfig)
MCFG_NVRAM_ADD_0FILL("smpc_nv") // TODO: default for each region (+ move it inside SMPC when converted to device)
MCFG_NVRAM_ADD_1FILL("nvram")
// TODO: custom RTC subdevice
MACHINE_CONFIG_END
@ -261,7 +262,7 @@ void smpc_hle_device::device_start()
system_time systime;
machine().base_datetime(systime);
m_smpc_nv->set_base(&m_smem, 4);
m_mini_nvram->set_base(&m_smem, 4);
m_mshres.resolve_safe();
m_mshnmi.resolve_safe();
@ -345,6 +346,9 @@ void smpc_hle_device::device_reset()
m_cur_dotsel = false;
m_rtc_timer->adjust(attotime::zero, 0, attotime::from_seconds(1));
// check if SMEM has valid data (default 1 filled), if not then simulate a battery backup fail (-> call the RTC / Language select menu for Saturn)
m_settime = m_smem[0] != 0xff;
}
device_memory_interface::space_config_vector smpc_hle_device::memory_space_config() const
@ -504,11 +508,6 @@ uint8_t smpc_hle_device::get_ddr(bool which)
}
inline bool smpc_hle_device::get_nmi_status()
{
return m_NMI_reset;
}
inline void smpc_hle_device::master_sh2_nmi()
{
m_mshnmi(1);
@ -657,6 +656,9 @@ void smpc_hle_device::device_timer(emu_timer &timer, device_timer_id id, int par
case 0x16: // SETTIME
{
// setting this up will clear the set time in case of battery backed died
m_settime = true;
for(int i=0;i<7;i++)
m_rtc_data[i] = m_ireg[i];
break;
@ -714,7 +716,7 @@ void smpc_hle_device::resolve_intback()
if(m_intback_buf[0] != 0)
{
m_oreg[0] = ((0x80) | ((m_NMI_reset & 1) << 6));
m_oreg[0] = ((m_settime << 7) | ((m_NMI_reset & 1) << 6));
for(i=0;i<7;i++)
m_oreg[1+i] = m_rtc_data[i];

4
src/devices/machine/smpc.h
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@ -180,10 +180,10 @@ private:
bool m_command_in_progress;
bool m_NMI_reset;
bool m_cur_dotsel;
bool m_settime;
void master_sh2_nmi();
void irq_request();
bool get_nmi_status();
void resolve_intback();
void intback_continue_request();
@ -199,7 +199,7 @@ private:
int m_pmode;
uint8_t m_region_code;
required_device<nvram_device> m_smpc_nv;
required_device<nvram_device> m_mini_nvram;
devcb_write_line m_mshres;
devcb_write_line m_mshnmi;
devcb_write_line m_sshres;

4
src/mame/drivers/stv.cpp
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@ -1353,8 +1353,8 @@ static INPUT_PORTS_START( stv )
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE1 )
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START2 )
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1P Push Switch") PORT_CODE(KEYCODE_7)
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2P Push Switch") PORT_CODE(KEYCODE_8)
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("1P Push Switch (Multi Cart Select)") PORT_CODE(KEYCODE_7) // selects game in multi-cart mode
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE ) PORT_NAME("2P Push Switch (Pause)") PORT_CODE(KEYCODE_8) // for games that supports it, most of them needs to be enabled in game assignment first
PORT_START("PORTE")
STV_PLAYER_INPUTS(3, BUTTON1, BUTTON2, BUTTON3, START)