// license:BSD-3-Clause // copyright-holders:Nigel Barnes /*************************************************************************** JCB Sound Extension Module The Dragon 32 Sound Extension Module is a cartridge by J.C.B. (Microsystems), that contains a General Instruments AY-3-8910 sound chip. This allows the Dragon to play interesting sound effects and complex chiptunes without taking all processor time. The cartridge also adds two 8-bit I/O ports (provided also by the AY-3-8910). The sound chip can be operated via the new commands in BASIC provided in the cartridge ROM, or via the 0xFEFE and 0xFEFF addresses. ***************************************************************************/ #include "emu.h" #include "dragon_jcbsnd.h" #include "speaker.h" ROM_START( dragon_jcbsnd ) ROM_REGION(0x8000, "eprom", ROMREGION_ERASE00) ROM_LOAD("D32SEM.ROM", 0x0000, 0x1000, CRC(4cd0f30b) SHA1(d07bb9272e3d3928059853730ff656905a80b68e)) ROM_END //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(DRAGON_JCBSND, dragon_jcbsnd_device, "dragon_jcbsnd", "Dragon Sound Extension Module") //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // dragon_jcbsnd_device - constructor //------------------------------------------------- dragon_jcbsnd_device::dragon_jcbsnd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, DRAGON_JCBSND, tag, owner, clock) , device_cococart_interface(mconfig, *this ) , m_ay8910(*this, "ay8910") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void dragon_jcbsnd_device::device_start() { m_cart = dynamic_cast(owner()); } //------------------------------------------------- // device_reset - device-specific startup //------------------------------------------------- void dragon_jcbsnd_device::device_reset() { set_line_value(line::CART, line_value::Q); address_space& space = machine().device("maincpu")->memory().space(AS_PROGRAM); space.install_write_handler(0xfefe, 0xfefe, WRITE8_DEVICE_DELEGATE(m_ay8910, ay8910_device, address_w)); space.install_readwrite_handler(0xfeff, 0xfeff, READ8_DEVICE_DELEGATE(m_ay8910, ay8910_device, data_r), WRITE8_DEVICE_DELEGATE(m_ay8910, ay8910_device, data_w)); } //------------------------------------------------- // dragon_jcbsnd_device::get_cart_base //------------------------------------------------- uint8_t* dragon_jcbsnd_device::get_cart_base() { return memregion("eprom")->base(); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- MACHINE_CONFIG_MEMBER( dragon_jcbsnd_device::device_add_mconfig ) MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_ADD("ay8910", AY8910, DERIVED_CLOCK(1, 4)) /* AY-3-8910 - clock not verified */ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) MACHINE_CONFIG_END //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *dragon_jcbsnd_device::device_rom_region() const { return ROM_NAME( dragon_jcbsnd ); }