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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Mikro-80 machine driver by Miodrag Milanovic
10/03/2008 Preliminary driver.
****************************************************************************/
#include "emu.h"
#include "includes/mikro80.h"
/* Driver initialization */
void mikro80_state::init_mikro80()
{
m_key_mask = 0x7f;
}
void mikro80_state::init_radio99()
{
m_key_mask = 0xff;
}
u8 mikro80_state::portb_r()
{
u8 key = 0xff;
for (u8 i = 0; i < 8; i++)
if (BIT(m_keyboard_mask, i))
key &= m_io_keyboard[i]->read();
return key & m_key_mask;
}
u8 mikro80_state::portc_r()
{
return m_io_keyboard[8]->read();
}
u8 mikro80_state::kristall2_portc_r()
{
return (m_io_keyboard[8]->read() & 0xfe) | ((m_cassette->input() < 0.04) ? 1 : 0);
}
void mikro80_state::porta_w(u8 data)
{
m_keyboard_mask = data ^ 0xff;
}
void mikro80_state::portc_w(u8 data)
{
m_cassette->output(BIT(data, 7) ? 1.0 : -1.0); // for Kristall2 only
}
void mikro80_state::machine_start()
{
save_item(NAME(m_keyboard_mask));
save_item(NAME(m_key_mask));
}
void mikro80_state::machine_reset()
{
m_keyboard_mask = 0;
address_space &program = m_maincpu->space(AS_PROGRAM);
program.install_rom(0x0000, 0x07ff, m_rom); // do it here for F3
m_rom_shadow_tap = program.install_read_tap(0xf800, 0xffff, "rom_shadow_r",[this](offs_t offset, u8 &data, u8 mem_mask)
{
if (!machine().side_effects_disabled())
{
// delete this tap
m_rom_shadow_tap->remove();
// reinstall ram over the rom shadow
m_maincpu->space(AS_PROGRAM).install_ram(0x0000, 0x07ff, m_ram);
}
// return the original data
return data;
});
}
void mikro80_state::tape_w(u8 data)
{
// Todo: this is incorrect, to be fixed when the CMT schematic can be found
m_cassette->output(BIT(data, 0) ? 1.0 : -1.0);
}
u8 mikro80_state::tape_r()
{
return (m_cassette->input() < 0.04) ? 0xff : 0;
}
void mikro80_state::sound_w(u8 data)
{
m_dac->write(BIT(data, 1));
}
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