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+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/***************************************************************************
+
+Ravensburger Selbstbaucomputer
+
+This is a project described in "Ravensburger" magazine. You had to make
+the entire thing (including the circuit boards) yourself.
+
+
+https://web.archive.org/web/20160321001634/http://petersieg.bplaced.com/?2650_Computer:2650_Selbstbaucomputer
+
+2013-04-23 Skeleton driver.
+
+No instructions, no schematics - it's all guesswork.
+
+The cassette saves a noise but it returns a bad load. This is why MNW is set.
+
+
+Version 0.9
+-----------
+Hardware:
+ 0000-07FF ROM "MON1"
+ 0800-1FFF RAM (3x HM6116)
+ 24 pushbuttons and 6-digit LED display on front panel.
+ Other buttons and switches on the main board.
+
+The few photos show the CPU and a number of ordinary 74LSxxx chips.
+There is a XTAL of unknown frequency.
+
+The buttons are labelled CMD, RUN, GOTO, RST, F, MON, PC, NXT but at
+this time not all buttons are identified.
+
+What is known:
+- Press NXT to read memory. Press NXT again to read the next address.
+- Press PC and it says PCxxxx
+- Press CMD, it says CND=, you can choose one of these:
+-- A displays value of a register. Press A again to see more registers.
+-- B sets a breakpoint
+-- C clears a breakpoint
+-- D dumps blocks to tape
+-- E examine tape file
+-- F fetch (load) from tape
+
+Quickload: Load the program then press Y. There are 6 that work and
+ 6 that do nothing.
+
+ToDo:
+- Cassette
+
+Version V2.0
+------------
+This used a terminal interface with a few non-standard control codes.
+The pushbuttons and LEDs appear to have been done away with.
+
+Commands (must be in uppercase):
+A Examine memory; press C to alter memory
+B Set breakpoint?
+C View breakpoint?
+D Dump to screen and tape (at the same time) D 00 04 dumps pages 0 to 4
+E Execute
+I Registers? (Esc to quit)
+L Load
+R ? (Esc to quit)
+V Verify
+
+ToDo:
+- Cassette
+
+****************************************************************************/
+
+#include "emu.h"
+
+#include "cpu/s2650/s2650.h"
+#include "imagedev/cassette.h"
+#include "imagedev/snapquik.h"
+#include "machine/terminal.h"
+#include "speaker.h"
+
+#include "ravens.lh"
+
+
+namespace {
+
+class ravens_base : public driver_device
+{
+public:
+ ravens_base(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_cass(*this, "cassette")
+ { }
+
+protected:
+ int cass_r();
+ void cass_w(int state);
+ DECLARE_QUICKLOAD_LOAD_MEMBER(quickload_cb);
+ void mem_map(address_map &map) ATTR_COLD;
+ required_device<s2650_device> m_maincpu;
+ required_device<cassette_image_device> m_cass;
+};
+
+class ravens_state : public ravens_base
+{
+public:
+ ravens_state(const machine_config &mconfig, device_type type, const char *tag)
+ : ravens_base(mconfig, type, tag)
+ , m_io_keyboard(*this, "X%u", 0U)
+ , m_digits(*this, "digit%u", 0U)
+ , m_leds(*this, "led%u", 0U)
+ { }
+
+ void ravens(machine_config &config);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+
+private:
+ void io_map(address_map &map) ATTR_COLD;
+ u8 port17_r();
+ void display_w(offs_t offset, u8 data);
+ void leds_w(u8 data);
+
+ required_ioport_array<3> m_io_keyboard;
+ output_finder<7> m_digits;
+ output_finder<8> m_leds;
+};
+
+class ravens2_state : public ravens_base
+{
+public:
+ ravens2_state(const machine_config &mconfig, device_type type, const char *tag)
+ : ravens_base(mconfig, type, tag)
+ , m_terminal(*this, "terminal")
+ { }
+
+ void ravens2(machine_config &config);
+
+protected:
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void machine_start() override ATTR_COLD;
+
+private:
+ void io_map(address_map &map) ATTR_COLD;
+ void kbd_put(u8 data);
+ u8 port07_r();
+ void port1b_w(u8 data);
+ void port1c_w(u8 data);
+ u8 m_term_out = 0U;
+ u8 m_term_in = 0U;
+ required_device<generic_terminal_device> m_terminal;
+};
+
+void ravens_base::cass_w(int state)
+{
+ m_cass->output(state ? -1.0 : +1.0);
+}
+
+int ravens_base::cass_r()
+{
+ return (m_cass->input() > 0.03) ? 1 : 0;
+}
+
+void ravens_state::machine_start()
+{
+ m_digits.resolve();
+ m_leds.resolve();
+}
+
+void ravens_state::display_w(offs_t offset, u8 data)
+{
+ m_digits[offset] = data;
+}
+
+void ravens_state::leds_w(u8 data)
+{
+ for (int i = 0; i < 8; i++)
+ m_leds[i] = !BIT(data, i);
+}
+
+u8 ravens2_state::port07_r()
+{
+ u8 ret = m_term_in;
+ if (!machine().side_effects_disabled())
+ m_term_in = 0x80;
+ return ret;
+}
+
+u8 ravens_state::port17_r()
+{
+ u8 keyin, i;
+
+ keyin = m_io_keyboard[0]->read();
+ if (keyin != 0xff)
+ for (i = 0; i < 8; i++)
+ if (BIT(~keyin, i))
+ return i | 0x80;
+
+ keyin = m_io_keyboard[1]->read();
+ if (keyin != 0xff)
+ for (i = 0; i < 8; i++)
+ if (BIT(~keyin, i))
+ return i | 0x88;
+
+ keyin = m_io_keyboard[2]->read();
+ if (!BIT(keyin, 0))
+ m_maincpu->reset();
+ if (keyin != 0xff)
+ for (i = 0; i < 8; i++)
+ if (BIT(~keyin, i))
+ return (i<<4) | 0x80;
+
+ return 0;
+}
+
+void ravens2_state::port1b_w(u8 data)
+{
+ if (BIT(data, 7))
+ return;
+ if (data == 1) // don't send PSU register to terminal
+ return;
+ else
+ if ((data == 0x08 && m_term_out == 0x20))
+ data = 0x0c; // FormFeed
+ else
+ if ((data == 0x0a && m_term_out == 0x20))
+ data = 0x0a; // LineFeed
+ else
+ data = m_term_out;
+
+ m_terminal->write(data);
+}
+
+void ravens2_state::port1c_w(u8 data)
+{
+ m_term_out = data;
+}
+
+void ravens2_state::machine_reset()
+{
+ m_term_in = 0x80;
+}
+
+void ravens2_state::machine_start()
+{
+ save_item(NAME(m_term_out));
+ save_item(NAME(m_term_in));
+}
+
+void ravens_base::mem_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x0000, 0x07ff).rom();
+ map(0x0800, 0x1fff).ram();
+ map(0x2000, 0x7FFF).ram(); // for quickload, optional
+}
+
+void ravens_state::io_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x09, 0x09).w(FUNC(ravens_state::leds_w)); // LED output port
+ map(0x10, 0x15).w(FUNC(ravens_state::display_w)); // 6-led display
+ map(0x17, 0x17).r(FUNC(ravens_state::port17_r)); // pushbuttons
+}
+
+void ravens2_state::io_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x07, 0x07).r(FUNC(ravens2_state::port07_r));
+ map(0x1b, 0x1b).w(FUNC(ravens2_state::port1b_w));
+ map(0x1c, 0x1c).w(FUNC(ravens2_state::port1c_w));
+}
+
+/* Input ports */
+static INPUT_PORTS_START( ravens )
+ PORT_START("X0")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("1") PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("2") PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("3") PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("4") PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("5") PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+
+ PORT_START("X1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("8") PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("9") PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+
+ PORT_START("X2")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RST") PORT_CODE(KEYCODE_F3)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("NXT") PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RUN") PORT_CODE(KEYCODE_X) PORT_CHAR('X')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("PC") PORT_CODE(KEYCODE_P) PORT_CHAR('P')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("???") PORT_CODE(KEYCODE_Y) PORT_CHAR('Y')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("???") PORT_CODE(KEYCODE_U) PORT_CHAR('U')
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("CMD") PORT_CODE(KEYCODE_M) PORT_CHAR('M')
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("???") PORT_CODE(KEYCODE_O) PORT_CHAR('O')
+INPUT_PORTS_END
+
+void ravens2_state::kbd_put(u8 data)
+{
+ if (data > 0x60) data -= 0x20; // fold to uppercase
+ m_term_in = data;
+}
+
+QUICKLOAD_LOAD_MEMBER(ravens_base::quickload_cb)
+{
+ int const quick_length = image.length();
+ if (quick_length < 0x0900)
+ return std::make_pair(image_error::INVALIDLENGTH, "File too short");
+ else if (quick_length > 0x8000)
+ return std::make_pair(image_error::INVALIDLENGTH, "File too long (must be no more than 32K)");
+
+ std::vector<u8> quick_data;
+ quick_data.resize(quick_length);
+ int const read_ = image.fread( &quick_data[0], quick_length);
+ if (read_ != quick_length)
+ return std::make_pair(image_error::UNSPECIFIED, "Cannot read the file");
+ else if (quick_data[0] != 0xc6)
+ return std::make_pair(image_error::INVALIDIMAGE, "Invalid header");
+
+ int const exec_addr = quick_data[2] * 256 + quick_data[3];
+ if (exec_addr >= quick_length)
+ {
+ return std::make_pair(
+ image_error::INVALIDIMAGE,
+ util::string_format("Exec address %04X beyond end of file %04X", exec_addr, quick_length));
+ }
+
+ constexpr int QUICK_ADDR = 0x900;
+ address_space &space = m_maincpu->space(AS_PROGRAM);
+ for (int i = QUICK_ADDR; i < read_; i++)
+ space.write_byte(i, quick_data[i]);
+
+ // display a message about the loaded quickload
+ image.message(" Quickload: size=%04X : exec=%04X",quick_length,exec_addr);
+
+ // Start the quickload
+ m_maincpu->set_state_int(S2650_PC, exec_addr);
+
+ return std::pair(std::error_condition(), std::string());
+}
+
+void ravens_state::ravens(machine_config &config)
+{
+ /* basic machine hardware */
+ S2650(config, m_maincpu, XTAL(1'000'000)); // frequency is unknown
+ m_maincpu->set_addrmap(AS_PROGRAM, &ravens_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &ravens_state::io_map);
+ m_maincpu->sense_handler().set(FUNC(ravens_state::cass_r));
+ m_maincpu->flag_handler().set(FUNC(ravens_state::cass_w));
+
+ /* video hardware */
+ config.set_default_layout(layout_ravens);
+
+ /* quickload */
+ QUICKLOAD(config, "quickload", "pgm", attotime::from_seconds(1)).set_load_callback(FUNC(ravens_state::quickload_cb));
+
+ SPEAKER(config, "mono").front_center();
+
+ /* cassette */
+ CASSETTE(config, m_cass);
+ m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
+}
+
+void ravens2_state::ravens2(machine_config &config)
+{
+ /* basic machine hardware */
+ S2650(config, m_maincpu, XTAL(1'000'000)); // frequency is unknown
+ m_maincpu->set_addrmap(AS_PROGRAM, &ravens2_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &ravens2_state::io_map);
+ m_maincpu->sense_handler().set(FUNC(ravens2_state::cass_r));
+ m_maincpu->flag_handler().set(FUNC(ravens2_state::cass_w));
+
+ /* video hardware */
+ GENERIC_TERMINAL(config, m_terminal, 0);
+ m_terminal->set_keyboard_callback(FUNC(ravens2_state::kbd_put));
+
+ /* quickload */
+ QUICKLOAD(config, "quickload", "pgm", attotime::from_seconds(1)).set_load_callback(FUNC(ravens2_state::quickload_cb));
+
+ SPEAKER(config, "mono").front_center();
+
+ /* cassette */
+ CASSETTE(config, m_cass);
+ m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
+}
+
+/* ROM definition */
+ROM_START( ravens )
+ ROM_REGION( 0x0800, "maincpu", 0 )
+ ROM_SYSTEM_BIOS( 0, "v1.0", "V1.0" )
+ ROMX_LOAD( "mon_v1.0.bin", 0x0000, 0x0800, CRC(785eb1ad) SHA1(c316b8ac32ab6aa37746af37b9f81a23367fedd8), ROM_BIOS(0))
+ ROM_SYSTEM_BIOS( 1, "v0.9", "V0.9" )
+ ROMX_LOAD( "mon_v0_9.bin", 0x0000, 0x07b5, CRC(2f9b9178) SHA1(ec2ebbc80ee9ff2502c1409ab4f99127032ed724), ROM_BIOS(1))
+ROM_END
+
+ROM_START( ravens2 )
+ ROM_REGION( 0x0800, "maincpu", 0 )
+ ROM_LOAD( "mon_v2.0.bin", 0x0000, 0x0800, CRC(bcd47c58) SHA1(f261a3f128fbedbf59a8b5480758fff4d7f76de1))
+ROM_END
+
+} // anonymous namespace
+
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1984, ravens, 0, 0, ravens, ravens, ravens_state, empty_init, "Joseph Glagla and Dieter Feiler", "Ravensburger Selbstbaucomputer V0.9", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )
+COMP( 1985, ravens2, ravens, 0, ravens2, ravens, ravens2_state, empty_init, "Joseph Glagla and Dieter Feiler", "Ravensburger Selbstbaucomputer V2.0", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW | MACHINE_SUPPORTS_SAVE )