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https://github.com/holub/mame
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lc80e: correct cpu speed
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hap
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@ -89,6 +89,7 @@ const double XTAL::known_xtals[] = {
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3'072'000, /* 3.072_MHz_XTAL INS 8520 input clock rate */
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3'120'000, /* 3.12_MHz_XTAL SP0250 clock on Gottlieb games */
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3'276'800, /* 3.2768_MHz_XTAL SP0256 clock in Speech Synthesis for Dragon 32 */
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3'300'000, /* 3.3_MHz_XTAL LC 80 (export) */
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3'521'280, /* 3.52128_MHz_XTAL RCA COSMAC VIP */
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3'546'800, /* 3.5468_MHz_XTAL Atari 400 PAL */
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3'546'894, /* 3.546894_MHz_XTAL Atari 2600 PAL */
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@ -31,17 +31,17 @@ Hardware notes (2-ROM version from schematics):
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- cassette port
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- 6*7seg display, 2 leds, piezo
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The PCB is literally inside a map that can be closed like a book.
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It has a nice calculator style keypad attached to it.
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The PCB is literally inside a map that can be closed like a book. It has a nice
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calculator style keypad attached to it.
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The memory can be expanded. There's an export version with more
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RAM/ROM by default, and it included a chess program called SC-80.
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SC-80 starts at ADR C800.
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The memory can be expanded. There's an export version with more RAM/ROM by
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default and a faster U880D CPU (3300.0kHz XTAL). It included a chess program
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called SC-80, that can be started by inputting ADR C800.
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TODO:
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- KSD11 switch
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- CTC clock inputs
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- CTC clock inputs ("user bus")
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- Most characters are lost when pasting (lc80, lc80e).
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- Add internal artwork for the clickable keypad, and an overlay for SC-80?
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@ -113,20 +113,19 @@ private:
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DECLARE_WRITE_LINE_MEMBER(ctc_z0_w);
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DECLARE_WRITE_LINE_MEMBER(ctc_z1_w);
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DECLARE_WRITE_LINE_MEMBER(ctc_z2_w);
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void pio1_pa_w(uint8_t data);
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uint8_t pio1_pb_r();
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void pio1_pb_w(uint8_t data);
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uint8_t pio2_pb_r();
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void pio1_pa_w(u8 data);
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u8 pio1_pb_r();
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void pio1_pb_w(u8 data);
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u8 pio2_pb_r();
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void update_display();
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// display state
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uint8_t m_digit;
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uint8_t m_segment;
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u8 m_digit;
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u8 m_segment;
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};
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/* Memory Maps */
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// Memory Maps
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void lc80_state::lc80_mem(address_map &map)
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{
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@ -163,7 +162,7 @@ void lc80_state::lc80_io(address_map &map)
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}
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/* Input Ports */
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// Input Ports
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INPUT_CHANGED_MEMBER( lc80_state::trigger_reset )
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{
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@ -214,7 +213,7 @@ static INPUT_PORTS_START( lc80 )
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INPUT_PORTS_END
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/* Z80-CTC Interface */
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// Z80-CTC Interface
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WRITE_LINE_MEMBER(lc80_state::ctc_z0_w)
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{
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@ -229,14 +228,14 @@ WRITE_LINE_MEMBER(lc80_state::ctc_z2_w)
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}
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/* Z80-PIO Interface */
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// Z80-PIO Interface
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void lc80_state::update_display()
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{
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m_display->matrix(m_digit >> 1, m_segment);
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}
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void lc80_state::pio1_pa_w(uint8_t data)
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void lc80_state::pio1_pa_w(u8 data)
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{
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/*
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@ -257,7 +256,7 @@ void lc80_state::pio1_pa_w(uint8_t data)
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update_display();
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}
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uint8_t lc80_state::pio1_pb_r()
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u8 lc80_state::pio1_pb_r()
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{
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/*
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@ -277,7 +276,7 @@ uint8_t lc80_state::pio1_pb_r()
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return (m_cassette->input() < +0.0);
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}
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void lc80_state::pio1_pb_w(uint8_t data)
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void lc80_state::pio1_pb_w(u8 data)
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{
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/*
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@ -294,18 +293,18 @@ void lc80_state::pio1_pb_w(uint8_t data)
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*/
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/* tape output */
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// tape output
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m_cassette->output(BIT(data, 1) ? +1.0 : -1.0);
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/* speaker */
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// speaker
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m_speaker->level_w(!BIT(data, 1));
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/* 7segs/led/keyboard */
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// 7segs/led/keyboard
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m_digit = ~data;
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update_display();
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}
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uint8_t lc80_state::pio2_pb_r()
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u8 lc80_state::pio2_pb_r()
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{
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/*
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@ -322,7 +321,7 @@ uint8_t lc80_state::pio2_pb_r()
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*/
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uint8_t data = 0xf0;
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u8 data = 0xf0;
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for (int i = 0; i < 6; i++)
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{
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@ -339,7 +338,7 @@ uint8_t lc80_state::pio2_pb_r()
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}
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/* Z80 Daisy Chain */
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// Z80 Daisy Chain
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static const z80_daisy_config lc80_daisy_chain[] =
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{
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@ -350,43 +349,45 @@ static const z80_daisy_config lc80_daisy_chain[] =
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};
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/* Machine Initialization */
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// Machine Initialization
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void lc80_state::machine_start()
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{
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m_halt_led.resolve();
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// install RAM
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address_space &program = m_maincpu->space(AS_PROGRAM);
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offs_t mirror = program.map()->m_globalmask & 0x5000;
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program.install_ram(0x2000, 0x2000 + m_ram->size() - 1, mirror, m_ram->pointer());
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const offs_t mirror = (program.map()->m_globalmask & 0xc000) | 0x1000;
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const offs_t start = 0x2000;
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program.install_ram(start, start + m_ram->size() - 1, mirror, m_ram->pointer());
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/* register for state saving */
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// register for state saving
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save_item(NAME(m_digit));
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save_item(NAME(m_segment));
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}
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/* Machine Driver */
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// Machine Driver
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void lc80_state::lc80(machine_config &config)
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{
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/* basic machine hardware */
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Z80(config, m_maincpu, 900000); /* UD880D */
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// basic machine hardware
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Z80(config, m_maincpu, 900000); // UD880D
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m_maincpu->set_addrmap(AS_PROGRAM, &lc80_state::lc80_mem);
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m_maincpu->set_addrmap(AS_IO, &lc80_state::lc80_io);
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m_maincpu->halt_cb().set(FUNC(lc80_state::halt_w));
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m_maincpu->set_daisy_config(lc80_daisy_chain);
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/* video hardware */
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// video hardware
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PWM_DISPLAY(config, m_display).set_size(1+6, 8);
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m_display->set_segmask(0x3f << 1, 0xff);
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config.set_default_layout(layout_lc80);
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/* sound hardware */
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// sound hardware
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SPEAKER(config, "mono").front_center();
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SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 0.25);
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/* devices */
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// devices
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Z80CTC(config, m_ctc, 900000);
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m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
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m_ctc->zc_callback<0>().set(FUNC(lc80_state::ctc_z0_w));
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@ -433,15 +434,16 @@ void lc80_state::lc80e(machine_config &config)
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m_maincpu->set_addrmap(AS_PROGRAM, &lc80_state::lc80e_mem);
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m_ram->set_default_size("4K");
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// it is running twice as fast
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m_maincpu->set_clock(1800000);
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m_ctc->set_clock(1800000);
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m_pio[0]->set_clock(1800000);
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m_pio[1]->set_clock(1800000);
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// it is running almost twice as fast
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const XTAL clk = 3.3_MHz_XTAL / 2;
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m_maincpu->set_clock(clk);
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m_ctc->set_clock(clk);
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m_pio[0]->set_clock(clk);
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m_pio[1]->set_clock(clk);
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}
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/* ROMs */
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// ROMs
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ROM_START( lc80 )
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ROM_REGION( 0x10000, "maincpu", 0 )
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@ -469,7 +471,7 @@ ROM_END
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} // anonymous namespace
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/* System Drivers */
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// System Drivers
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// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY, FULLNAME, FLAGS
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COMP( 1984, lc80, 0, 0, lc80, lc80, lc80_state, empty_init, "VEB Mikroelektronik \"Karl Marx\" Erfurt", "Lerncomputer LC 80 (set 1)", MACHINE_SUPPORTS_SAVE )
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