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https://github.com/holub/mame
synced 2025-04-19 15:11:37 +03:00
(MESS) nes_datach: documented the eeprom hookups, and the
second eeprom used by Battle Rush. they do not work yet. nw.
This commit is contained in:
Fabio Priuli
parent
c164e73a4b
commit
a4ad409630
@ -10,7 +10,7 @@
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<info name="release" value="19931112"/>
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<info name="alt_title" value="データック バトルラッシュ"/>
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<part name="cart" interface="datach_cart">
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<feature name="slot" value="datach_rom" />
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<feature name="slot" value="datach_ep1" />
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<feature name="pcb" value="BANDAI-DATACH" />
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<dataarea name="rom" size="262144">
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<rom name="datach - battle rush - build up robot tournament (japan).prg" size="262144" crc="983d8175" sha1="29cc759d5ca214eefc0cc1c6ce0f8b9111e58124" offset="00000" status="baddump" />
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@ -27,6 +27,11 @@
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#define LOG_MMC(x) do { if (VERBOSE) logerror x; } while (0)
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#define EEPROM_INTERNAL 0
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#define EEPROM_EXTERNAL 1
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#define TEST_EEPROM 0
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//--------------------------------
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//
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@ -40,6 +45,7 @@
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datach_cart_interface::datach_cart_interface(const machine_config &mconfig, device_t &device)
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: device_slot_card_interface(mconfig, device),
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m_i2cmem(*this, "i2cmem"),
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m_rom(NULL),
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m_rom_size(0)
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{
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@ -141,6 +147,7 @@ bool nes_datach_slot_device::call_softlist_load(char *swlist, char *swname, rom_
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const char * nes_datach_slot_device::get_default_card_software(const machine_config &config, emu_options &options)
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{
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// any way to detect the game with X24C01?
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return software_get_default_slot(config, options, this, "datach_rom");
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}
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@ -149,6 +156,11 @@ const char * nes_datach_slot_device::get_default_card_software(const machine_con
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//
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// Datach Minicart implementation
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//
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// Two kinds of PCB exist
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// * ROM only, used by most games
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// * ROM + X24C01 EEPROM, used by
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// Battle Rush
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//
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//--------------------------------
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ROM_START( datach_rom )
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@ -156,6 +168,13 @@ ROM_START( datach_rom )
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ROM_END
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const device_type NES_DATACH_ROM = &device_creator<nes_datach_rom_device>;
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const device_type NES_DATACH_24C01 = &device_creator<nes_datach_24c01_device>;
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nes_datach_rom_device::nes_datach_rom_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
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: device_t(mconfig, type, name, tag, owner, clock, "nes_datach_24c01", __FILE__),
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datach_cart_interface( mconfig, *this )
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{
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}
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nes_datach_rom_device::nes_datach_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, NES_DATACH_ROM, "NES Datach ROM", tag, owner, clock, "nes_datach_rom", __FILE__),
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@ -163,6 +182,12 @@ nes_datach_rom_device::nes_datach_rom_device(const machine_config &mconfig, cons
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{
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}
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nes_datach_24c01_device::nes_datach_24c01_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: nes_datach_rom_device(mconfig, NES_DATACH_24C01, "NES Datach + 24C01 PCB", tag, owner, clock, "nes_datach_ep1", __FILE__)
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{
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}
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void nes_datach_rom_device::device_start()
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{
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m_rom = (UINT8*)memregion("datachrom")->base();
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@ -185,6 +210,16 @@ UINT8 *nes_datach_rom_device::get_cart_base()
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}
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MACHINE_CONFIG_FRAGMENT( subcart_i2c_24c01 )
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MCFG_24C01_ADD("i2cmem")
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MACHINE_CONFIG_END
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machine_config_constructor nes_datach_24c01_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( subcart_i2c_24c01 );
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}
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//---------------------------------
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//
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// Datach Base Unit implementation
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@ -226,6 +261,7 @@ void nes_datach_device::pcb_reset()
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m_irq_enable = 0;
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m_irq_count = 0;
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m_datach_latch = 0;
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m_i2c_in_use = EEPROM_INTERNAL;
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}
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@ -261,7 +297,17 @@ void nes_datach_device::pcb_reset()
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READ8_MEMBER(nes_datach_device::read_m)
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{
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LOG_MMC(("Datach read_m, offset: %04x\n", offset));
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return m_datach_latch;
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UINT8 i2c_val = 0;
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#if TEST_EEPROM
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if (m_i2c_dir)
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{
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if (m_i2c_in_use == EEPROM_INTERNAL)
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i2c_val = (m_i2cmem->read_sda() & 1) << 4;
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if (m_i2c_in_use == EEPROM_EXTERNAL && m_subslot->m_cart && m_subslot->m_cart->m_i2cmem)
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i2c_val = (m_subslot->m_cart->m_i2cmem->read_sda() & 1) << 4;
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}
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#endif
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return m_datach_latch | i2c_val;
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}
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@ -285,16 +331,36 @@ WRITE8_MEMBER(nes_datach_device::write_h)
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{
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case 0: case 1: case 2: case 3:
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case 4: case 5: case 6: case 7:
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// these don't switch CHR bank, but are SCL output
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// of the oncart I2C EEPROM!
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// these don't switch CHR bank (if you try this, both Battle Rush and SD Gundam Wars will have glitches!)
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// bit3 goes to SCL of the external EEPROM (and we use write=1 to enable reading from this EEPROM)
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// docs from naruko don't specify the bit, our choice comes from observation of writes performed by Battle Rush
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#if TEST_EEPROM
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if (m_subslot->m_cart && m_subslot->m_cart->m_i2cmem)
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{
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if (BIT(data, 3))
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m_i2c_in_use = EEPROM_EXTERNAL;
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m_subslot->m_cart->m_i2cmem->write_scl(BIT(data, 3));
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}
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#endif
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break;
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case 0x08:
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m_subslot->write_prg_bank(data & 0x0f);
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break;
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case 0x0d:
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// these should go to the I2C EEPROM on the Datach base
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// but SDA line is shared with the oncart I2C EEPROM if
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// there is one (only in Datach - Battle Rush)
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#if TEST_EEPROM
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// bit7, select SDA direction LZ93D50P -> EEPROM or EEPROM -> LZ93D50P
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m_i2c_dir = BIT(data, 7);
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// bit6 goes to SDA line, which is in common with the 2nd EEPROM, if present
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m_i2cmem->write_sda(BIT(data, 6));
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if (m_subslot->m_cart && m_subslot->m_cart->m_i2cmem)
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m_subslot->m_cart->m_i2cmem->write_sda(BIT(data, 6));
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// bit5 goes to SCL of the internal EEPROM (and we use write=1 to enable reading from this EEPROM)
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if (BIT(data, 5))
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m_i2c_in_use = EEPROM_INTERNAL;
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m_i2cmem->write_scl(BIT(data, 5));
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#endif
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break;
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default:
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fcg_write(space, offset & 0x0f, data, mem_mask);
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@ -302,13 +368,13 @@ WRITE8_MEMBER(nes_datach_device::write_h)
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}
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}
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//-------------------------------------------------
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// BARCODE READER + CART SLOT + X24C02
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//-------------------------------------------------
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static SLOT_INTERFACE_START(datach_cart)
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SLOT_INTERFACE("datach_rom", NES_DATACH_ROM)
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SLOT_INTERFACE("datach_ep1", NES_DATACH_24C01)
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SLOT_INTERFACE_END
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@ -26,6 +26,8 @@ public:
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UINT8 *get_cart_base() { return m_rom; }
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void write_prg_bank(UINT8 bank) { m_bank = bank; }
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optional_device<i2cmem_device> m_i2cmem;
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protected:
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// internal state
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UINT8 *m_rom;
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@ -94,6 +96,7 @@ class nes_datach_rom_device : public device_t,
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{
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public:
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// construction/destruction
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nes_datach_rom_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source);
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nes_datach_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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// optional information overrides
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@ -106,8 +109,21 @@ protected:
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virtual void device_reset();
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};
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// ======================> nes_datach_24c01_device
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class nes_datach_24c01_device : public nes_datach_rom_device
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{
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public:
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// construction/destruction
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nes_datach_24c01_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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// optional information overrides
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virtual machine_config_constructor device_mconfig_additions() const;
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};
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// device type definition
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extern const device_type NES_DATACH_ROM;
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extern const device_type NES_DATACH_24C01;
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//---------------------------------
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@ -140,6 +156,7 @@ protected:
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required_device<barcode_reader_device> m_reader;
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required_device<nes_datach_slot_device> m_subslot;
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UINT8 m_i2c_dir;
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UINT8 m_i2c_in_use;
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static const device_timer_id TIMER_SERIAL = 1;
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emu_timer *serial_timer;
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