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Diffstat (limited to 'src/mame/homebrew/ravens.cpp')
-rw-r--r-- | src/mame/homebrew/ravens.cpp | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/src/mame/homebrew/ravens.cpp b/src/mame/homebrew/ravens.cpp new file mode 100644 index 00000000000..bd9eea8fef6 --- /dev/null +++ b/src/mame/homebrew/ravens.cpp @@ -0,0 +1,417 @@ +// 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 ) |