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-// license:BSD-3-Clause
-// copyright-holders:Curt Coder, Robbbert
-/*****************************************************************************************
-
- ETI project 660, featured in the Australian magazine Electronics Today International.
-
- Commands:
- R - Reset (use this before any other instruction)
- S - Step
- 0 - Enter modify memory mode
- 2 - Save memory to cassette
- 4 - Load memory from cassette
- 6 - start binary program
- 8 - start chip-8 program.
-
- To modify memory, press R, 0, enter 4-digit address, S, enter data, S, continue on.
- R to escape.
-
- To save a tape, enter the start address into 0400,0401 (big endian), and the end
- address into 0402,0403. Press R. Press record on the tape, press 2.
-
- To load a tape, enter the start and end addresses as above. Press R, 4. Screen goes
- black. Press play on tape. If the screen is still black after the tape ends, press R.
-
- All chip-8 programs start at 0600. The manual says the max end address is 7FF (gives
- 512 bytes), but you can fill up all of memory (gives 2560 bytes).
-
- TODO:
- - sometimes there's no sound when started. You may need to hard reset until it beeps.
- - doesn't run programs for other chip-8 computers (this might be normal?)
- - we support BIN files, but have none to test with.
- - possible CPU bugs?:
- - in Invaders, can't shoot them
- - in Maze, the result is rubbish (works in Emma02 emulator v1.21, but not in v1.30)
-
-**************************************************************************************************/
-
-#include "emu.h"
-#include "includes/eti660.h"
-#include "screen.h"
-#include "speaker.h"
-
-
-/* Read/Write Handlers */
-// Schematic is wrong, PCB layout is correct: D0-7 swapped around on PIA.
-// There's still a bug in the PIA: if ca2 is instructed to go low, nothing happens.
-READ8_MEMBER( eti660_state::pia_r )
-{
- uint8_t pia_offset = m_maincpu->get_memory_address() & 0x03;
-
- return bitswap<8>(m_pia->read(pia_offset), 0,1,2,3,4,5,6,7);
-}
-
-WRITE8_MEMBER( eti660_state::pia_w )
-{
- uint8_t pia_offset = m_maincpu->get_memory_address() & 0x03;
- data = bitswap<8>(data,0,1,2,3,4,5,6,7);
- m_pia->write(pia_offset, data);
-
- // handle bug in PIA
- if ((pia_offset == 1) && ((data & 0x30) == 0x30))
- ca2_w(BIT(data, 3));
-}
-
-WRITE_LINE_MEMBER( eti660_state::ca2_w ) // test with Wipeout game - it should start up in colour
-{
- m_color_on = !state;
- m_cti->con_w(state);
-}
-
-WRITE8_MEMBER( eti660_state::colorram_w )
-{
- offset = m_maincpu->get_memory_address() - 0xc80;
-
- uint8_t colorram_offset = (((offset & 0x1f0) >> 1) | (offset & 0x07));
-
- if (colorram_offset < 0xc0)
- m_color_ram[colorram_offset] = data;
-}
-
-/* Memory Maps */
-
-void eti660_state::mem_map(address_map &map)
-{
- map.global_mask(0xfff);
- map(0x0000, 0x03ff).rom();
- map(0x0400, 0x047f).ram();
- map(0x0480, 0x05ff).ram().share("videoram");
- map(0x0600, 0x0fff).ram();
-}
-
-void eti660_state::io_map(address_map &map)
-{
- map(0x01, 0x01).rw(m_cti, FUNC(cdp1864_device::dispon_r), FUNC(cdp1864_device::step_bgcolor_w));
- map(0x02, 0x02).rw(FUNC(eti660_state::pia_r), FUNC(eti660_state::pia_w));
- map(0x03, 0x03).w(FUNC(eti660_state::colorram_w));
- map(0x04, 0x04).rw(m_cti, FUNC(cdp1864_device::dispoff_r), FUNC(cdp1864_device::tone_latch_w));
-}
-
-/* Input Ports */
-static INPUT_PORTS_START( eti660 )
- PORT_START("KEY.0")
- PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
- PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2')
- PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
- PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
- PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
-
- PORT_START("KEY.1")
- PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
- PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
- PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
- PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
- PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
-
- PORT_START("KEY.2")
- PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
- PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
- PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
- PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
- PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
-
- PORT_START("KEY.3")
- PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F')
- PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
- PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
- PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
- PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
-
- PORT_START("SPECIAL")
- PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_NAME("RESET") PORT_CODE(KEYCODE_R)
- PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYPAD ) PORT_NAME("STEP") PORT_CODE(KEYCODE_S)
-INPUT_PORTS_END
-
-/* CDP1802 Interface */
-
-READ_LINE_MEMBER( eti660_state::clear_r )
-{
- // A hack to make the machine reset itself on
- // boot, like the real one does.
- if (m_resetcnt < 0xffff)
- m_resetcnt++;
- if (m_resetcnt == 0xf000)
- return 0;
- return BIT(m_special->read(), 0); // R key
-}
-
-READ_LINE_MEMBER( eti660_state::ef2_r )
-{
- return m_cassette->input() < 0;
-}
-
-READ_LINE_MEMBER( eti660_state::ef4_r )
-{
- return BIT(m_special->read(), 1); // S key
-}
-
-WRITE_LINE_MEMBER( eti660_state::q_w )
-{
- /* CDP1864 audio output enable */
- m_cti->aoe_w(state);
-
- /* PULSE led */
- m_leds[LED_PULSE] = state ? 1 : 0;
-
- /* tape output */
- m_cassette->output(state ? 1.0 : -1.0);
-}
-
-WRITE8_MEMBER( eti660_state::dma_w )
-{
- offset -= 0x480;
-
- m_color = 7;
-
- if (m_color_on)
- {
- uint8_t colorram_offset = ((offset & 0x1f0) >> 1) | (offset & 0x07);
-
- if (colorram_offset < 0xc0)
- m_color = m_color_ram[colorram_offset];
- }
- else
- m_color = m_p_videoram[offset] ? 7 : 0;
-
- m_cti->dma_w(space, offset, data);
-}
-
-/* PIA6821 Interface */
-
-READ8_MEMBER( eti660_state::pia_pa_r )
-{
- /*
-
- bit description
-
- PA0 keyboard row 0
- PA1 keyboard row 1
- PA2 keyboard row 2
- PA3 keyboard row 3
- PA4 keyboard column 0
- PA5 keyboard column 1
- PA6 keyboard column 2
- PA7 keyboard column 3
-
- */
-
- uint8_t i, data = 0xff;
-
- for (i = 0; i < 4; i++)
- if (BIT(m_keylatch, i))
- return m_io_keyboard[i]->read();
-
- return data;
-}
-
-WRITE8_MEMBER( eti660_state::pia_pa_w )
-{
- /*
-
- bit description
-
- PA0 keyboard row 0
- PA1 keyboard row 1
- PA2 keyboard row 2
- PA3 keyboard row 3
- PA4 keyboard column 0
- PA5 keyboard column 1
- PA6 keyboard column 2
- PA7 keyboard column 3
-
- */
-
- m_keylatch = bitswap<8>(data,0,1,2,3,4,5,6,7) ^ 0xff;
-}
-
-void eti660_state::machine_reset()
-{
- m_resetcnt = 0;
- m_color_on = 0;
- m_cti->con_w(0);
- m_maincpu->reset(); // needed
-}
-
-void eti660_state::machine_start()
-{
- m_leds.resolve();
-
- save_item(NAME(m_color_ram));
- save_item(NAME(m_color));
- save_item(NAME(m_color_on));
- save_item(NAME(m_keylatch));
- save_item(NAME(m_resetcnt));
-}
-
-QUICKLOAD_LOAD_MEMBER(eti660_state::quickload_cb)
-{
- address_space &space = m_maincpu->space(AS_PROGRAM);
- int i;
- int quick_addr = 0x600;
- int quick_length;
- std::vector<uint8_t> quick_data;
- int read_;
- image_init_result result = image_init_result::FAIL;
-
- quick_length = image.length();
- quick_data.resize(quick_length);
- read_ = image.fread( &quick_data[0], quick_length);
- if (read_ != quick_length)
- {
- image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Cannot read the file");
- image.message(" Cannot read the file");
- }
- else
- {
- for (i = 0; i < quick_length; i++)
- if ((quick_addr + i) < 0x1000)
- space.write_byte(i + quick_addr, quick_data[i]);
-
- /* display a message about the loaded quickload */
- if (image.is_filetype("bin"))
- image.message(" Quickload: size=%04X : start=%04X : end=%04X : Press 6 to start",quick_length,quick_addr,quick_addr+quick_length);
- else
- image.message(" Quickload: size=%04X : start=%04X : end=%04X : Press 8 to start",quick_length,quick_addr,quick_addr+quick_length);
-
- result = image_init_result::PASS;
- }
-
- return result;
-}
-
-/* Machine Drivers */
-
-void eti660_state::eti660(machine_config &config)
-{
- /* basic machine hardware */
- CDP1802(config, m_maincpu, XTAL(8'867'238)/5);
- m_maincpu->set_addrmap(AS_PROGRAM, &eti660_state::mem_map);
- m_maincpu->set_addrmap(AS_IO, &eti660_state::io_map);
- m_maincpu->wait_cb().set_constant(1);
- m_maincpu->clear_cb().set(FUNC(eti660_state::clear_r));
- m_maincpu->ef2_cb().set(FUNC(eti660_state::ef2_r));
- m_maincpu->ef4_cb().set(FUNC(eti660_state::ef4_r));
- m_maincpu->q_cb().set(FUNC(eti660_state::q_w));
- m_maincpu->dma_wr_cb().set(FUNC(eti660_state::dma_w));
-
- /* video hardware */
- SCREEN(config, SCREEN_TAG, SCREEN_TYPE_RASTER);
-
- /* sound hardware */
- SPEAKER(config, "mono").front_center();
- CDP1864(config, m_cti, XTAL(8'867'238)/5).set_screen(SCREEN_TAG);
- m_cti->inlace_cb().set_constant(0);
- m_cti->int_cb().set_inputline(m_maincpu, COSMAC_INPUT_LINE_INT);
- m_cti->dma_out_cb().set_inputline(m_maincpu, COSMAC_INPUT_LINE_DMAOUT);
- m_cti->efx_cb().set_inputline(m_maincpu, COSMAC_INPUT_LINE_EF1);
- m_cti->rdata_cb().set([this] () { return BIT(m_color, 0); });
- m_cti->bdata_cb().set([this] () { return BIT(m_color, 1); });
- m_cti->gdata_cb().set([this] () { return BIT(m_color, 2); });
- m_cti->set_chrominance(RES_K(2.2), RES_K(1), RES_K(4.7), RES_K(4.7)); // R7, R5, R6, R4
- m_cti->add_route(ALL_OUTPUTS, "mono", 0.25);
-
- /* devices */
- PIA6821(config, m_pia, 0);
- m_pia->readpa_handler().set(FUNC(eti660_state::pia_pa_r));
- m_pia->writepa_handler().set(FUNC(eti660_state::pia_pa_w));
- m_pia->ca2_handler().set(FUNC(eti660_state::ca2_w)); // not working, bug in pia
- m_pia->irqa_handler().set_inputline(m_maincpu, COSMAC_INPUT_LINE_INT).invert(); // FIXME: use an input merger for these lines
- m_pia->irqb_handler().set_inputline(m_maincpu, COSMAC_INPUT_LINE_INT).invert();
-
- CASSETTE(config, m_cassette);
- m_cassette->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
- m_cassette->add_route(ALL_OUTPUTS, "mono", 0.05);
-
- /* internal ram */
- RAM(config, RAM_TAG).set_default_size("3K");
-
- /* quickload */
- QUICKLOAD(config, "quickload", "bin,c8,ch8", attotime::from_seconds(2)).set_load_callback(FUNC(eti660_state::quickload_cb));
-}
-
-/* ROMs */
-
-ROM_START( eti660 )
- ROM_REGION( 0x10000, CDP1802_TAG, 0 )
- ROM_LOAD( "eti660.bin", 0x0000, 0x0400, CRC(811dfa62) SHA1(c0c4951e02f873f15560bdc3f35cdf3f99653922) )
-ROM_END
-
-// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
-COMP( 1981, eti660, 0, 0, eti660, eti660, eti660_state, empty_init, "Electronics Today International", "ETI-660", 0 )