// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Radio-86RK machine driver by Miodrag Milanovic
06/03/2008 Preliminary driver.
****************************************************************************/
#include "emu.h"
#include "includes/radio86.h"
#include "cpu/i8085/i8085.h"
void radio86_state::radio86_init_keyboard()
{
m_keyboard_mask = 0;
m_tape_value = 0x10;
}
/* Driver initialization */
void radio86_state::init_radio86()
{
radio86_init_keyboard();
}
void radio86_state::init_radioram()
{
init_radio86();
m_radio_ram_disk = make_unique_clear<u8[]>(0x20000);
save_pointer(NAME(m_radio_ram_disk), 0x20000);
}
u8 radio86_state::radio86_8255_portb_r2()
{
u8 key = 0xff;
for (u8 i = 0; i < 8; i++)
if (BIT(m_keyboard_mask, i))
key &= m_io_line[i]->read();
return key;
}
uint8_t radio86_state::kr03_8255_portb_r2()
{
uint8_t key = 0xff;
uint16_t data;
for (int i = 0; i < 8; i++)
{
if (BIT(m_keyboard_mask, i))
{
data = m_io_line[i]->read();
if (!BIT(data, 8)) data &= ~3;
if (!BIT(data, 9)) data &= ~5;
if (!BIT(data, 10)) data &= ~7;
key &= data;
}
}
return key;
}
u8 radio86_state::radio86_8255_portc_r2()
{
double level = m_cassette->input();
u8 dat = m_io_line[8]->read();
if (level < 0)
dat ^= m_tape_value;
return dat;
}
void radio86_state::radio86_8255_porta_w2(u8 data)
{
m_keyboard_mask = data ^ 0xff;
}
void radio86_state::radio86_8255_portc_w2(u8 data)
{
m_cassette->output(data & 0x01 ? 1 : -1);
}
u8 radio86_state::rk7007_8255_portc_r()
{
double level = m_cassette->input();
u8 key = 0xff;
for (u8 i = 0; i < 8; i++)
if ((m_keyboard_mask & (1 << i))!=0)
key &= m_io_cline[i]->read();
key &= 0xe0;
if (level < 0)
key ^= m_tape_value;
return key;
}
void radio86_state::hrq_w(int state)
{
/* HACK - this should be connected to the BUSREQ line of Z80 */
m_maincpu->set_input_line(INPUT_LINE_HALT, state);
/* HACK - this should be connected to the BUSACK line of Z80 */
m_dma->hlda_w(state);
}
u8 radio86_state::memory_read_byte(offs_t offset)
{
address_space& prog_space = m_maincpu->space(AS_PROGRAM);
return prog_space.read_byte(offset);
}
void radio86_state::memory_write_byte(offs_t offset, u8 data)
{
address_space& prog_space = m_maincpu->space(AS_PROGRAM);
return prog_space.write_byte(offset, data);
}
u8 radio86_state::radio_cpu_state_r()
{
// FIXME: the driver should handle the status callback rather than accessing this through the state interface
return m_maincpu->state_int(i8080_cpu_device::I8085_STATUS);
}
u8 radio86_state::radio_io_r(offs_t offset)
{
return m_maincpu->space(AS_PROGRAM).read_byte((offset << 8) + offset);
}
void radio86_state::radio_io_w(offs_t offset, u8 data)
{
m_maincpu->space(AS_PROGRAM).write_byte((offset << 8) + offset,data);
}
void radio86_state::machine_reset()
{
m_keyboard_mask = 0;
m_disk_sel = 0;
address_space &program = m_maincpu->space(AS_PROGRAM);
program.install_rom(0x0000, 0x0fff, m_rom); // do it here for F3
m_rom_shadow_tap = program.install_read_tap(0xf000, 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, 0x0fff, m_ram);
}
// return the original data
return data;
});
}
void radio86_state::machine_start()
{
save_item(NAME(m_tape_value));
save_item(NAME(m_keyboard_mask));
save_item(NAME(m_romdisk_lsb));
save_item(NAME(m_romdisk_msb));
save_item(NAME(m_disk_sel));
}
void radio86_state::radio86_pagesel(u8 data)
{
m_disk_sel = data;
}
u8 radio86_state::radio86rom_romdisk_porta_r()
{
u16 addr = (m_romdisk_msb << 8) | m_romdisk_lsb;
if (m_cart->exists() && addr < m_cart->get_rom_size())
return m_cart->read_rom(addr);
else
return 0xff;
}
u8 radio86_state::radio86ram_romdisk_porta_r()
{
u8 *romdisk = m_rom + 0x10000;
if ((m_disk_sel & 0x0f) ==0)
return romdisk[m_romdisk_msb*256+m_romdisk_lsb];
else if (m_disk_sel==0xdf)
return m_radio_ram_disk[m_romdisk_msb*256+m_romdisk_lsb + 0x10000];
else
return m_radio_ram_disk[m_romdisk_msb*256+m_romdisk_lsb];
}
void radio86_state::radio86_romdisk_portb_w(u8 data)
{
m_romdisk_lsb = data;
}
void radio86_state::radio86_romdisk_portc_w(u8 data)
{
m_romdisk_msb = data;
}
I8275_DRAW_CHARACTER_MEMBER(radio86_state::display_pixels)
{
rgb_t const *const palette = m_palette->palette()->entry_list_raw();
u8 pixels = m_chargen[(linecount & 7) + (charcode << 3)] ^ 0xff;
if (vsp)
pixels = 0;
if (lten)
pixels = 0xff;
if (rvv)
pixels ^= 0xff;
for (u8 i = 0; i < 6; i++)
bitmap.pix(y, x + i) = palette[(pixels >> (5-i)) & 1 ? (hlgt ? 2 : 1) : 0];
}
static constexpr rgb_t radio86_pens[3] = {
{ 0x00, 0x00, 0x00 }, // black
{ 0xa0, 0xa0, 0xa0 }, // white
{ 0xff, 0xff, 0xff } // highlight
};
void radio86_state::radio86_palette(palette_device &palette) const
{
palette.set_pen_colors(0, radio86_pens);
}