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// license:BSD-3-Clause
// copyright-holders:Sergey Svishchev
/***************************************************************************
Krokha ("Tiny") TV game. Screen is 48x32 monochrome text.
Only known cartridge has 5 built-in games:
- Breakout
- Tetris
- Snake
- Xonix
- Air Defence
https://zx-pk.ru/threads/26306-igrovaya-pristavka-quot-krokha-quot.html
discussion
http://www.nedopc.org/forum/viewtopic.php?f=90&t=11458
discussion + schematics
http://alemorf.ru/comps/kroha/index.html
photos
To do: second joystick, keyboard (?)
****************************************************************************/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "sound/spkrdev.h"
#include "emupal.h"
#include "screen.h"
#include "speaker.h"
class krokha_state : public driver_device
{
public:
krokha_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_screen(*this, "screen")
, m_p_videoram(*this, "videoram")
, m_p_chargen(*this, "chargen")
, m_speaker(*this, "speaker")
{ }
static constexpr feature_type imperfect_features() { return feature::CONTROLS; }
void krokha(machine_config &config);
private:
virtual void machine_reset() override;
uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
void krokha_mem(address_map &map);
void status_callback(uint8_t data);
void speaker_w(uint8_t data);
required_device<i8080_cpu_device> m_maincpu;
required_device<screen_device> m_screen;
required_shared_ptr<u8> m_p_videoram;
required_region_ptr<u8> m_p_chargen;
required_device<speaker_sound_device> m_speaker;
int m_speaker_state;
};
//
void krokha_state::status_callback(uint8_t data)
{
if (data & i8080_cpu_device::STATUS_INTA)
{
/* interrupt acknowledge */
m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
}
}
void krokha_state::speaker_w(uint8_t data)
{
m_speaker_state = BIT(data, 1);
m_speaker->level_w(m_speaker_state);
}
//
void krokha_state::krokha_mem(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0x1fff).rom();
map(0xe000, 0xe7ff).ram().mirror(0x0800).share("videoram");
map(0xf7ff, 0xf7ff).portr("P1").w(FUNC(krokha_state::speaker_w));
}
static INPUT_PORTS_START( krokha )
PORT_START("P1")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END
void krokha_state::machine_reset()
{
m_speaker_state = 0;
m_speaker->level_w(m_speaker_state);
// setup save states
save_item(NAME(m_speaker_state));
}
uint32_t krokha_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for (uint8_t y = 0; y < 32; y++)
{
uint16_t ma = 0xe0 + y;
for (uint8_t ra = 0; ra < 8; ra++)
{
for (uint16_t x = ma; x < ma + 64*32; x += 32)
{
uint16_t chr = m_p_videoram[x] << 3;
uint8_t gfx = m_p_chargen[chr | ra];
for (int i = 0; i < 8; i++)
{
bitmap.pix(y * 8 + ra, (x - ma) / 4 + i) = BIT(gfx, 7 - i);
}
}
}
}
return 0;
}
void krokha_state::krokha(machine_config &config)
{
I8080(config, m_maincpu, 2000000);
m_maincpu->set_addrmap(AS_PROGRAM, &krokha_state::krokha_mem);
m_maincpu->out_status_func().set(FUNC(krokha_state::status_callback));
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
m_screen->set_refresh_hz(50);
m_screen->set_vblank_time(ATTOSECONDS_IN_USEC(2500)); // XXX
m_screen->set_size(64*8, 32*8);
m_screen->set_visarea(9*8, (48+9)*8-1, 0*8, 32*8-1);
m_screen->set_screen_update(FUNC(krokha_state::screen_update));
m_screen->set_palette("palette");
m_screen->screen_vblank().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
PALETTE(config, "palette", palette_device::MONOCHROME);
SPEAKER(config, "mono").front_center();
SPEAKER_SOUND(config, "speaker").add_route(ALL_OUTPUTS, "mono", 1.00);
}
ROM_START( krokha )
ROM_REGION(0x2000, "maincpu", ROMREGION_ERASE00)
ROM_LOAD("bios.bin", 0x0000, 0x2000, CRC(e37556f4) SHA1(b1da9d7338eb227b0aff5675719f7a2aab607e66))
ROM_REGION(0x0800, "chargen", ROMREGION_ERASE00)
ROM_LOAD("font.bin", 0x0000, 0x0800, CRC(2f4fcfb5) SHA1(175cafe3dc9291f505d69aced9c405c38b7f7086))
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
COMP( 1990, krokha, 0, 0, krokha, krokha, krokha_state, empty_init, "SKB Kontur", "Krokha", 0 )
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