diff options
Diffstat (limited to 'src/devices/bus/msx_cart/fmpac.cpp')
-rw-r--r-- | src/devices/bus/msx_cart/fmpac.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/devices/bus/msx_cart/fmpac.cpp b/src/devices/bus/msx_cart/fmpac.cpp new file mode 100644 index 00000000000..c4222094c1a --- /dev/null +++ b/src/devices/bus/msx_cart/fmpac.cpp @@ -0,0 +1,173 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +/********************************************************************************** + +When backing up the SRAM from an FM-PAC the file seems to be prefixed +with: PAC2 BACKUP DATA. We only store the raw sram contents. + +**********************************************************************************/ + +#include "emu.h" +#include "fmpac.h" + +const device_type MSX_CART_FMPAC = &device_creator<msx_cart_fmpac>; + + +msx_cart_fmpac::msx_cart_fmpac(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_FMPAC, "MSX Cartridge - FM-PAC", tag, owner, clock, "msx_cart_fmpac", __FILE__) + , msx_cart_interface(mconfig, *this) + , m_ym2413(*this, "ym2413") + , m_selected_bank(0) + , m_bank_base(NULL) + , m_sram_active(false) + , m_opll_active(false) + , m_1ffe(0) + , m_1fff(0) + , m_7ff6(0) +{ +} + + +static MACHINE_CONFIG_FRAGMENT( fmpac ) + // This is actually incorrect. The sound output is passed back into the MSX machine where it is mixed internally and output through the system 'speaker'. + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD("ym2413", YM2413, XTAL_10_738635MHz/3) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40) +MACHINE_CONFIG_END + + +machine_config_constructor msx_cart_fmpac::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( fmpac ); +} + + +void msx_cart_fmpac::device_start() +{ + save_item(NAME(m_selected_bank)); + save_item(NAME(m_sram_active)); + save_item(NAME(m_opll_active)); + save_item(NAME(m_1ffe)); + save_item(NAME(m_1fff)); + save_item(NAME(m_7ff6)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_fmpac::restore_banks), this)); + + // Install IO read/write handlers + address_space &space = machine().device<cpu_device>("maincpu")->space(AS_IO); + space.install_write_handler(0x7c, 0x7d, write8_delegate(FUNC(msx_cart_fmpac::write_ym2413), this)); +} + + +void msx_cart_fmpac::restore_banks() +{ + m_bank_base = get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000; +} + + +void msx_cart_fmpac::device_reset() +{ + m_selected_bank = 0; + m_sram_active = false; + m_opll_active = false; + m_1ffe = 0; + m_1fff = 0; + m_7ff6 = 0; +} + + +void msx_cart_fmpac::initialize_cartridge() +{ + if ( get_rom_size() != 0x10000 ) + { + fatalerror("fmpac: Invalid ROM size\n"); + } + + if ( get_sram_size() != 0x2000 ) + { + fatalerror("fmpac: Invalid SRAM size\n"); + } + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_fmpac::read_cart) +{ + if (offset >= 0x4000 && offset < 0x8000) + { + if (offset == 0x7ff6) + { + return m_7ff6; + } + if (offset == 0x7ff7) + { + return m_selected_bank & 0x03; + } + if (m_sram_active) + { + if (offset & 0x2000) + { + return 0xff; + } + return get_sram_base()[offset & 0x1fff]; + } + else + { + return m_bank_base[offset & 0x3fff]; + } + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_fmpac::write_cart) +{ + if (offset >= 0x4000 && offset < 0x6000) + { + if (m_sram_active) + { + get_sram_base()[offset & 0x1fff] = data; + } + if (offset == 0x5ffe) + { + m_1ffe = data; + } + if (offset == 0x5fff) + { + m_1fff = data; + } + m_sram_active = (m_1ffe == 0x4d) && (m_1fff == 0x69); + } + + switch (offset) + { + case 0x7ff4: + case 0x7ff5: + if (m_opll_active) + { + m_ym2413->write(space, offset & 1, data); + } + break; + + case 0x7ff6: + m_7ff6 = data & 0x11; + m_opll_active = (m_7ff6 & 0x01); + break; + + case 0x7ff7: + m_selected_bank = data; + restore_banks(); + break; + } + +} + + +WRITE8_MEMBER(msx_cart_fmpac::write_ym2413) +{ + if (m_opll_active) + { + m_ym2413->write(space, offset & 1, data); + } +} |