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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/***************************************************************************
+
+CKZ-80
+
+2010-08-30 Skeleton driver
+2010-11-27 Connected to a terminal
+2014-01-08 Added devices
+
+Only known info: http://forumcpm.gaby.de/oldboard/showtopic0adb.html?threadid=280
+
+On main board there are Z80A CPU, Z80A PIO, Z80A DART and Z80A CTC
+ there is 8K ROM and XTAL 16MHz
+ Two undumped proms, AM27S20DC and D3631-1.
+FDC board contains Z80A DMA and NEC 765A (XTAL on it is 8MHZ)
+Mega board contains 74LS612 and memory chips (32x 41256)
+
+Status:
+ It prints 2 lines of text, then waits for a floppy.
+
+ToDo:
+- Everything... no diagram or manuals, so EVERYTHING below is guesswork.
+- Need software
+
+I/O ports: These ranges are what is guessed
+ 40 : rom switching
+ 4c-4F : PIO
+ 50-53 : DART
+ 54-57 : CTC
+ 80-81 : Parallel port (no programming bytes are sent, so it isn't a device)
+ C0-C1 : FDC
+ It is not known what address is used by:
+ - the DMA
+ - the Motor-on signal(s)
+ as there are no unknown writes.
+
+
+****************************************************************************/
+
+#include "emu.h"
+
+#include "cpu/z80/z80.h"
+#include "imagedev/floppy.h"
+#include "machine/terminal.h"
+#include "machine/upd765.h"
+#include "machine/z80ctc.h"
+#include "machine/z80daisy.h"
+#include "machine/z80pio.h"
+#include "machine/z80sio.h"
+
+
+namespace {
+
+class ckz80_state : public driver_device
+{
+public:
+ ckz80_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_rom(*this, "maincpu")
+ , m_ram(*this, "mainram")
+ , m_bank1(*this, "bank1")
+ , m_terminal(*this, "terminal")
+ , m_fdc(*this, "fdc")
+ { }
+
+ void ckz80(machine_config &config);
+
+private:
+ virtual void machine_start() override ATTR_COLD;
+ virtual void machine_reset() override ATTR_COLD;
+ u8 port80_r();
+ u8 port81_r();
+ void port40_w(u8 data);
+ void kbd_put(u8 data);
+ void ctc_z0_w(int state);
+ void ctc_z1_w(int state);
+ void ctc_z2_w(int state);
+ void io_map(address_map &map) ATTR_COLD;
+ void mem_map(address_map &map) ATTR_COLD;
+ u8 m_term_data = 0U;
+ memory_passthrough_handler m_rom_shadow_tap;
+ required_device<z80_device> m_maincpu;
+ required_region_ptr<u8> m_rom;
+ required_shared_ptr<u8> m_ram;
+ required_memory_bank m_bank1;
+ required_device<generic_terminal_device> m_terminal;
+ required_device<upd765a_device> m_fdc;
+};
+
+
+void ckz80_state::port40_w(u8 data)
+{
+ m_bank1->set_entry(BIT(~data, 1));
+}
+
+u8 ckz80_state::port80_r()
+{
+ u8 ret = m_term_data;
+ m_term_data = 0;
+ return ret;
+}
+
+u8 ckz80_state::port81_r()
+{
+ return (m_term_data) ? 3 : 1;
+}
+
+void ckz80_state::mem_map(address_map &map)
+{
+ map(0x0000, 0xffff).ram().share("mainram");
+ map(0xe000, 0xffff).bankr("bank1");
+}
+
+void ckz80_state::io_map(address_map &map)
+{
+ map.global_mask(0xff);
+ map(0x40, 0x40).w(FUNC(ckz80_state::port40_w));
+ map(0x4c, 0x4f).rw("pio", FUNC(z80pio_device::read), FUNC(z80pio_device::write));
+ map(0x50, 0x53).rw("dart", FUNC(z80dart_device::cd_ba_r), FUNC(z80dart_device::cd_ba_w));
+ map(0x54, 0x57).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
+ // 80, 81 - no setup bytes
+ map(0x80, 0x80).r(FUNC(ckz80_state::port80_r)).w(m_terminal, FUNC(generic_terminal_device::write));
+ map(0x81, 0x81).r(FUNC(ckz80_state::port81_r));
+ map(0xc0, 0xc1).m(m_fdc, FUNC(upd765a_device::map));
+}
+
+/* Input ports */
+static INPUT_PORTS_START( ckz80 )
+INPUT_PORTS_END
+
+/* Z80 Daisy Chain */
+
+static const z80_daisy_config daisy_chain[] =
+{
+ { "pio" },
+ { "dart" },
+ { "ctc" },
+ { nullptr }
+};
+
+/* Z80-CTC Interface */
+
+void ckz80_state::ctc_z0_w(int state)
+{
+// guess this generates clock for z80dart
+}
+
+void ckz80_state::ctc_z1_w(int state)
+{
+}
+
+void ckz80_state::ctc_z2_w(int state)
+{
+}
+
+void ckz80_state::machine_start()
+{
+ m_bank1->configure_entry(0, m_ram+0xe000);
+ m_bank1->configure_entry(1, m_rom);
+ save_item(NAME(m_term_data));
+}
+
+void ckz80_state::machine_reset()
+{
+ address_space &program = m_maincpu->space(AS_PROGRAM);
+ program.install_rom(0x0000, 0x1fff, m_rom); // do it here for F3
+ m_rom_shadow_tap.remove();
+ m_rom_shadow_tap = program.install_read_tap(
+ 0xe000, 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, 0x1fff, m_ram);
+ }
+ },
+ &m_rom_shadow_tap);
+
+ m_bank1->set_entry(1);
+}
+
+static void ckz80_floppies(device_slot_interface &device)
+{
+ device.option_add("525dd", FLOPPY_525_DD);
+}
+
+void ckz80_state::kbd_put(u8 data)
+{
+ m_term_data = data;
+}
+
+void ckz80_state::ckz80(machine_config &config)
+{
+ /* basic machine hardware */
+ Z80(config, m_maincpu, 16_MHz_XTAL / 4);
+ m_maincpu->set_addrmap(AS_PROGRAM, &ckz80_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &ckz80_state::io_map);
+ m_maincpu->set_daisy_config(daisy_chain);
+
+ GENERIC_TERMINAL(config, m_terminal, 0);
+ m_terminal->set_keyboard_callback(FUNC(ckz80_state::kbd_put));
+ UPD765A(config, m_fdc, 8_MHz_XTAL, true, true);
+ FLOPPY_CONNECTOR(config, "fdc:0", ckz80_floppies, "525dd", floppy_image_device::default_mfm_floppy_formats);
+
+ z80ctc_device& ctc(Z80CTC(config, "ctc", 16_MHz_XTAL / 4));
+ ctc.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
+ ctc.zc_callback<0>().set(FUNC(ckz80_state::ctc_z0_w));
+ ctc.zc_callback<1>().set(FUNC(ckz80_state::ctc_z1_w));
+ ctc.zc_callback<2>().set(FUNC(ckz80_state::ctc_z2_w));
+
+ z80dart_device& dart(Z80DART(config, "dart", 16_MHz_XTAL / 4));
+ //dart.out_txda_callback().set("rs232", FUNC(rs232_port_device::write_txd));
+ //dart.out_dtra_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
+ //dart.out_rtsa_callback().set("rs232", FUNC(rs232_port_device::write_rts));
+ dart.out_int_callback().set_inputline("maincpu", INPUT_LINE_IRQ0);
+
+ z80pio_device& pio(Z80PIO(config, "pio", 16_MHz_XTAL / 4));
+ pio.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
+}
+
+
+/* ROM definition */
+ROM_START( ckz80 )
+ ROM_REGION( 0x2000, "maincpu", 0 )
+ ROM_LOAD( "ckz80.rom", 0x0000, 0x2000, CRC(7081b7c6) SHA1(13f75b14ea73b252bdfa2384e6eead6e720e49e3))
+ROM_END
+
+} // anonymous namespace
+
+/* Driver */
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 198?, ckz80, 0, 0, ckz80, ckz80, ckz80_state, empty_init, "<unknown>", "CKZ-80", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )