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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
JCB Sound Extension Module
http://archive.worldofdragon.org/index.php?title=Dragon_32_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(0x1000, "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()
{
install_write_handler(0xfefe, 0xfefe, write8smo_delegate(FUNC(ay8910_device::address_w), (ay8910_device *)m_ay8910));
install_readwrite_handler(0xfeff, 0xfeff, read8smo_delegate(FUNC(ay8910_device::data_r), (ay8910_device *)m_ay8910), write8smo_delegate(FUNC(ay8910_device::data_w), (ay8910_device *)m_ay8910));
set_line_value(line::CART, line_value::Q);
}
//-------------------------------------------------
// dragon_jcbsnd_device::get_cart_base
//-------------------------------------------------
uint8_t* dragon_jcbsnd_device::get_cart_base()
{
return memregion("eprom")->base();
}
//-------------------------------------------------
// dragon_jcbsnd_device::get_cart_memregion
//-------------------------------------------------
memory_region* dragon_jcbsnd_device::get_cart_memregion()
{
return memregion("eprom");
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void dragon_jcbsnd_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "mono").front_center();
AY8910(config, m_ay8910, DERIVED_CLOCK(1, 1)); /* AY-3-8910 - clock not verified */
m_ay8910->add_route(ALL_OUTPUTS, "mono", 1.00);
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const tiny_rom_entry *dragon_jcbsnd_device::device_rom_region() const
{
return ROM_NAME( dragon_jcbsnd );
}
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