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https://github.com/holub/mame
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tiki100: Used PROM for memory mapping. [Curt Coder]
This commit is contained in:
Curt Coder
parent
c18820c99d
commit
93d9d28df9
@ -30,67 +30,55 @@
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/* Memory Banking */
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READ8_MEMBER( tiki100_state::gfxram_r )
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READ8_MEMBER( tiki100_state::read )
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{
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UINT16 addr = (offset + (m_scroll << 7)) & TIKI100_VIDEORAM_MASK;
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int mdis = 1;
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offs_t prom_addr = mdis << 5 | m_vire << 4 | m_rome << 3 | (offset >> 13);
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UINT8 prom = m_prom->base()[prom_addr] ^ 0xff;
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return m_video_ram[addr];
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}
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UINT8 data = 0xff;
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WRITE8_MEMBER( tiki100_state::gfxram_w )
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{
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UINT16 addr = (offset + (m_scroll << 7)) & TIKI100_VIDEORAM_MASK;
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m_video_ram[addr] = data;
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}
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void tiki100_state::bankswitch()
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{
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address_space &program = m_maincpu->space(AS_PROGRAM);
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if (m_vire)
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if (prom & ROM0)
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{
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if (!m_rome)
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{
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/* reserved */
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program.unmap_readwrite(0x0000, 0xffff);
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}
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else
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{
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/* GFXRAM, GFXRAM, RAM */
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program.install_readwrite_handler(0x0000, 0x7fff, READ8_DELEGATE(tiki100_state, gfxram_r), WRITE8_DELEGATE(tiki100_state, gfxram_w));
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program.install_readwrite_bank(0x8000, 0xffff, "bank3");
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membank("bank1")->set_entry(BANK_VIDEO_RAM);
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membank("bank2")->set_entry(BANK_VIDEO_RAM);
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membank("bank3")->set_entry(BANK_RAM);
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}
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data = m_rom->base()[offset & 0x3fff];
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}
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else
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if (prom & ROM1)
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{
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if (!m_rome)
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{
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/* ROM, RAM, RAM */
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program.install_read_bank(0x0000, 0x3fff, "bank1");
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program.unmap_write(0x0000, 0x3fff);
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program.install_readwrite_bank(0x4000, 0x7fff, "bank2");
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program.install_readwrite_bank(0x8000, 0xffff, "bank3");
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data = m_rom->base()[0x2000 | (offset & 0x3fff)];
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}
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membank("bank1")->set_entry(BANK_ROM);
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membank("bank2")->set_entry(BANK_RAM);
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membank("bank3")->set_entry(BANK_RAM);
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}
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else
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{
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/* RAM, RAM, RAM */
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program.install_readwrite_bank(0x0000, 0x3fff, "bank1");
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program.install_readwrite_bank(0x4000, 0x7fff, "bank2");
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program.install_readwrite_bank(0x8000, 0xffff, "bank3");
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if (prom & VIR)
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{
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UINT16 addr = (offset + (m_scroll << 7)) & TIKI100_VIDEORAM_MASK;
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membank("bank1")->set_entry(BANK_RAM);
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membank("bank2")->set_entry(BANK_RAM);
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membank("bank3")->set_entry(BANK_RAM);
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}
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data = m_video_ram[addr];
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}
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if (prom & RAM)
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{
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data = m_ram->pointer()[offset];
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}
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return data;
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}
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WRITE8_MEMBER( tiki100_state::write )
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{
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int mdis = 1;
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offs_t prom_addr = mdis << 5 | m_vire << 4 | m_rome << 3 | (offset >> 13);
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UINT8 prom = m_prom->base()[prom_addr] ^ 0xff;
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if (prom & VIR)
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{
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UINT16 addr = (offset + (m_scroll << 7)) & TIKI100_VIDEORAM_MASK;
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m_video_ram[addr] = data;
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}
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if (prom & RAM)
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{
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m_ram->pointer()[offset] = data;
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}
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}
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@ -215,17 +203,13 @@ WRITE8_MEMBER( tiki100_state::system_w )
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/* bankswitch */
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m_rome = BIT(data, 2);
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m_vire = BIT(data, 3);
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bankswitch();
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}
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/* Memory Maps */
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static ADDRESS_MAP_START( tiki100_mem, AS_PROGRAM, 8, tiki100_state )
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x0000, 0x3fff) AM_RAMBANK("bank1")
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AM_RANGE(0x4000, 0x7fff) AM_RAMBANK("bank2")
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AM_RANGE(0x8000, 0xffff) AM_RAMBANK("bank3")
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AM_RANGE(0x0000, 0xffff) AM_READWRITE(read, write)
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( tiki100_io, AS_IO, 8, tiki100_state )
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@ -601,20 +585,6 @@ void tiki100_state::machine_start()
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/* allocate video RAM */
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m_video_ram.allocate(TIKI100_VIDEORAM_SIZE);
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/* setup memory banking */
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UINT8 *ram = m_ram->pointer();
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membank("bank1")->configure_entry(BANK_ROM, m_rom->base());
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membank("bank1")->configure_entry(BANK_RAM, ram);
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membank("bank1")->configure_entry(BANK_VIDEO_RAM, m_video_ram);
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membank("bank2")->configure_entry(BANK_RAM, ram + 0x4000);
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membank("bank2")->configure_entry(BANK_VIDEO_RAM, m_video_ram + 0x4000);
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membank("bank3")->configure_entry(BANK_RAM, ram + 0x8000);
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bankswitch();
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/* register for state saving */
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save_item(NAME(m_rome));
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save_item(NAME(m_vire));
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@ -718,15 +688,15 @@ MACHINE_CONFIG_END
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/* ROMs */
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ROM_START( kontiki )
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ROM_REGION( 0x10000, Z80_TAG, ROMREGION_ERASEFF )
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ROM_REGION( 0x4000, Z80_TAG, ROMREGION_ERASEFF )
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ROM_LOAD( "tikirom-1.30.u10", 0x0000, 0x2000, CRC(c482dcaf) SHA1(d140706bb7fc8b1fbb37180d98921f5bdda73cf9) )
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ROM_REGION( 0x100, "proms", 0 )
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ROM_REGION( 0x100, "u4", 0 )
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ROM_LOAD( "53ls140.u4", 0x000, 0x100, CRC(894b756f) SHA1(429e10de0e0e749246895801b18186ff514c12bc) )
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ROM_END
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ROM_START( tiki100 )
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ROM_REGION( 0x10000, Z80_TAG, ROMREGION_ERASEFF )
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ROM_REGION( 0x4000, Z80_TAG, ROMREGION_ERASEFF )
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ROM_DEFAULT_BIOS( "v203w" )
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ROM_SYSTEM_BIOS( 0, "v135", "TIKI ROM v1.35" )
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@ -734,7 +704,7 @@ ROM_START( tiki100 )
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ROM_SYSTEM_BIOS( 1, "v203w", "TIKI ROM v2.03 W" )
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ROMX_LOAD( "tikirom-2.03w.u10", 0x0000, 0x2000, CRC(79662476) SHA1(96336633ecaf1b2190c36c43295ac9f785d1f83a), ROM_BIOS(2) )
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ROM_REGION( 0x100, "proms", 0 )
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ROM_REGION( 0x100, "u4", 0 )
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ROM_LOAD( "53ls140.u4", 0x000, 0x100, CRC(894b756f) SHA1(429e10de0e0e749246895801b18186ff514c12bc) )
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ROM_REGION( 0x1000, "8088", 0 )
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@ -41,8 +41,8 @@
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class tiki100_state : public driver_device
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{
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public:
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tiki100_state(const machine_config &mconfig, device_type type, const char *tag)
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: driver_device(mconfig, type, tag),
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tiki100_state(const machine_config &mconfig, device_type type, const char *tag) :
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driver_device(mconfig, type, tag),
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m_maincpu(*this, Z80_TAG),
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m_ctc(*this, Z80CTC_TAG),
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m_fdc(*this, FD1797_TAG),
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@ -54,6 +54,7 @@ public:
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m_cassette(*this, CASSETTE_TAG),
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m_centronics(*this, CENTRONICS_TAG),
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m_rom(*this, Z80_TAG),
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m_prom(*this, "u4"),
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m_video_ram(*this, "video_ram"),
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m_y1(*this, "Y1"),
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m_y2(*this, "Y2"),
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@ -67,7 +68,9 @@ public:
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m_y10(*this, "Y10"),
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m_y11(*this, "Y11"),
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m_y12(*this, "Y12"),
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m_palette(*this, "palette")
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m_palette(*this, "palette"),
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m_rome(1),
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m_vire(1)
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{ }
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required_device<cpu_device> m_maincpu;
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@ -81,6 +84,7 @@ public:
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required_device<cassette_image_device> m_cassette;
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required_device<centronics_device> m_centronics;
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required_memory_region m_rom;
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required_memory_region m_prom;
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optional_shared_ptr<UINT8> m_video_ram;
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required_ioport m_y1;
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required_ioport m_y2;
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@ -101,8 +105,9 @@ public:
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UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
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DECLARE_READ8_MEMBER( gfxram_r );
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DECLARE_WRITE8_MEMBER( gfxram_w );
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DECLARE_READ8_MEMBER( read );
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DECLARE_WRITE8_MEMBER( write );
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DECLARE_READ8_MEMBER( keyboard_r );
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DECLARE_WRITE8_MEMBER( keyboard_w );
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DECLARE_WRITE8_MEMBER( video_mode_w );
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@ -117,7 +122,13 @@ public:
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DECLARE_FLOPPY_FORMATS( floppy_formats );
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void bankswitch();
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enum
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{
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ROM0 = 0x01,
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ROM1 = 0x02,
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VIR = 0x04,
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RAM = 0x08
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};
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/* memory state */
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int m_rome;
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