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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*
mboardd.cpp - Mockingboard D emulation
by R. Belmont
The Apple IIc didn't have slots, so Sweet Micro Systems came up with this, a Mockingboard
in a little box that attached to the IIc's modem port. There's nothing special about the
IIc though - with a proper cable, anything that speaks 9600 8N1 RS-232 could drive this
device.
A decent disassembly of the 6803 firmware is available from the Apple II Documentation Project:
https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Audio/Sweet%20Microsystems%20Mockingboard/Source%20Code/
*/
#include "emu.h"
#include "mboardd.h"
#include "speaker.h"
ROM_START(mboardd)
ROM_REGION(0x800, "mbcpu", 0)
ROM_LOAD("mockingboard d rom.bin", 0x000000, 0x000800, CRC(277b1813) SHA1(e8d20f4b59fe867ff76434d35a14d2cbdc8533e3))
ROM_END
mockingboard_d_device::mockingboard_d_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, SERIAL_MOCKINGBOARD_D, tag, owner, clock)
, device_rs232_port_interface(mconfig, *this)
, m_cpu(*this, "mbdcpu")
, m_ay1(*this, "ay1")
, m_ay2(*this, "ay2")
{
}
void mockingboard_d_device::device_add_mconfig(machine_config &config)
{
M6803(config, m_cpu, 4.9152_MHz_XTAL); // value reverse-engineered from 9600 baud SCI rate needed
m_cpu->set_addrmap(AS_PROGRAM, &mockingboard_d_device::m6803_mem);
m_cpu->in_p2_cb().set(FUNC(mockingboard_d_device::p2_r));
m_cpu->out_p1_cb().set(FUNC(mockingboard_d_device::p1_w));
m_cpu->out_ser_tx_cb().set(FUNC(mockingboard_d_device::ser_tx_w));
SPEAKER(config, "lspeaker").front_left();
SPEAKER(config, "rspeaker").front_right();
AY8913(config, m_ay1, 1022727);
m_ay1->add_route(ALL_OUTPUTS, "lspeaker", 0.5);
AY8913(config, m_ay2, 1022727);
m_ay2->add_route(ALL_OUTPUTS, "lspeaker", 0.5);
}
const tiny_rom_entry *mockingboard_d_device::device_rom_region() const
{
return ROM_NAME(mboardd);
}
void mockingboard_d_device::device_start()
{
}
void mockingboard_d_device::device_reset()
{
output_dcd(0);
output_dsr(0);
output_cts(0);
}
void mockingboard_d_device::m6803_mem(address_map &map)
{
map(0x8000, 0x83ff).ram();
// SSI-263 at a000/a001
map(0xc000, 0xc000).w(FUNC(mockingboard_d_device::c000_w));
map(0xf800, 0xffff).rom().region("mbcpu", 0);
}
WRITE_LINE_MEMBER(mockingboard_d_device::input_txd)
{
m_rx_state = (state & 1);
}
void mockingboard_d_device::p1_w(u8 data)
{
if (BIT(data, 3))
{
m_ay2->address_w(m_c000_latch);
//printf("%02x to AY2 address\n", m_c000_latch);
}
else if (BIT(data, 2))
{
m_ay2->data_w(m_c000_latch);
//printf("%02x to AY2 data\n", m_c000_latch);
}
else if (BIT(data, 1))
{
m_ay1->address_w(m_c000_latch);
//printf("%02x to AY1 address\n", m_c000_latch);
}
else if (BIT(data, 0))
{
m_ay1->data_w(m_c000_latch);
//printf("%02x to AY1 data\n", m_c000_latch);
}
}
DEFINE_DEVICE_TYPE(SERIAL_MOCKINGBOARD_D, mockingboard_d_device, "mockingboardd", "Sweet Micro Systems Mockingboard D")
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