mirror of
https://github.com/holub/mame
synced 2025-10-06 09:00:04 +03:00
e6712208ea
According to the C++ standard 14.7 clause 5, "an explicit instantiation definition shall appear at most once in a program". Move the instantiation from the individual implementation files to the interface implementation file. Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
// license:BSD-3-Clause
|
|
// copyright-holders:Nathan Woods
|
|
/***************************************************************************
|
|
|
|
coco_orch90.cpp
|
|
|
|
Code for emulating the CoCo Orch-90 (Orchestra 90) sound cartridge
|
|
|
|
The Orch-90 was a simple sound cartridge; it had two 8-bit DACs
|
|
supporting stereo sound. The left channel was at $FF7A, and the right
|
|
channel was at $FF7B
|
|
|
|
|
|
Hidden Code exists in the ORCH-90 to produce a higher quality output.
|
|
Once you start the PAK, hit "SHIFT+ENTER" at the title screen. Once you
|
|
are at command, type the following (playing the William Tell default):
|
|
"S" + "ENTER"
|
|
"P" + "SHIFT+ENTER"
|
|
|
|
The output will be cleaner due to code causing a change in CPU speed by
|
|
addressing CPU registers to run the 6809 at 2x speed.
|
|
|
|
"P" + "ENTER" will play at regular CPU speed. The difference should be
|
|
very noticable.
|
|
|
|
***************************************************************************/
|
|
|
|
#include "emu.h"
|
|
#include "coco_orch90.h"
|
|
#include "cococart.h"
|
|
|
|
#include "sound/dac.h"
|
|
#include "sound/volt_reg.h"
|
|
#include "speaker.h"
|
|
|
|
|
|
//**************************************************************************
|
|
// ROM DECLARATIONS
|
|
//**************************************************************************
|
|
|
|
ROM_START(coco_orch90)
|
|
ROM_REGION(0x2000, "eprom", ROMREGION_ERASE00)
|
|
ROM_LOAD("orchestra 90,1984,26 - 3143,tandy.rom", 0x0000, 0x2000, CRC(15fb39af) SHA1(6a20fee9c70b36a6435ac8378f31d5b626017df0))
|
|
ROM_END
|
|
|
|
|
|
//**************************************************************************
|
|
// ORCH90 DEVICE CLASS
|
|
//**************************************************************************
|
|
|
|
namespace
|
|
{
|
|
// ======================> coco_orch90_device
|
|
|
|
class coco_orch90_device :
|
|
public device_t,
|
|
public device_cococart_interface
|
|
{
|
|
public:
|
|
// construction/destruction
|
|
coco_orch90_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
|
|
: device_t(mconfig, COCO_ORCH90, tag, owner, clock)
|
|
, device_cococart_interface(mconfig, *this)
|
|
, m_ldac(*this, "ldac")
|
|
, m_rdac(*this, "rdac")
|
|
{
|
|
}
|
|
|
|
// optional information overrides
|
|
virtual void device_add_mconfig(machine_config &config) override;
|
|
|
|
protected:
|
|
// device-level overrides
|
|
virtual void device_start() override
|
|
{
|
|
// install handlers
|
|
install_write_handler(0xFF7A, 0xFF7A, write8_delegate(FUNC(coco_orch90_device::write_left), this));
|
|
install_write_handler(0xFF7B, 0xFF7B, write8_delegate(FUNC(coco_orch90_device::write_right), this));
|
|
|
|
// Orch-90 ties CART to Q
|
|
set_line_value(line::CART, line_value::Q);
|
|
}
|
|
|
|
virtual const tiny_rom_entry *device_rom_region() const override
|
|
{
|
|
return ROM_NAME(coco_orch90);
|
|
}
|
|
|
|
// CoCo cartridge level overrides
|
|
virtual uint8_t *get_cart_base() override
|
|
{
|
|
return memregion("eprom")->base();
|
|
}
|
|
|
|
private:
|
|
WRITE8_MEMBER(write_left) { m_ldac->write(data); }
|
|
WRITE8_MEMBER(write_right) { m_rdac->write(data); }
|
|
|
|
// internal state
|
|
required_device<dac_byte_interface> m_ldac;
|
|
required_device<dac_byte_interface> m_rdac;
|
|
};
|
|
};
|
|
|
|
|
|
//**************************************************************************
|
|
// MACHINE AND ROM DECLARATIONS
|
|
//**************************************************************************
|
|
|
|
MACHINE_CONFIG_START(coco_orch90_device::device_add_mconfig)
|
|
SPEAKER(config, "lspeaker").front_left();
|
|
SPEAKER(config, "rspeaker").front_right();
|
|
MCFG_DEVICE_ADD("ldac", DAC_8BIT_R2R, 0) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "lspeaker", 0.5) // ls374.ic5 + r7 (8x20k) + r9 (8x10k)
|
|
MCFG_DEVICE_ADD("rdac", DAC_8BIT_R2R, 0) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "rspeaker", 0.5) // ls374.ic4 + r6 (8x20k) + r8 (8x10k)
|
|
MCFG_DEVICE_ADD("vref", VOLTAGE_REGULATOR, 0) MCFG_VOLTAGE_REGULATOR_OUTPUT(5.0)
|
|
MCFG_SOUND_ROUTE(0, "ldac", 1.0, DAC_VREF_POS_INPUT) MCFG_SOUND_ROUTE(0, "ldac", -1.0, DAC_VREF_NEG_INPUT)
|
|
MCFG_SOUND_ROUTE(0, "rdac", 1.0, DAC_VREF_POS_INPUT) MCFG_SOUND_ROUTE(0, "rdac", -1.0, DAC_VREF_NEG_INPUT)
|
|
MACHINE_CONFIG_END
|
|
|
|
|
|
//**************************************************************************
|
|
// DEVICE DECLARATION
|
|
//**************************************************************************
|
|
|
|
DEFINE_DEVICE_TYPE_PRIVATE(COCO_ORCH90, device_cococart_interface, coco_orch90_device, "coco_orch90", "CoCo Orch-90 PAK")
|