diff options
author | Robbbert <Robbbert@users.noreply.github.com> | 2019-05-15 02:38:32 +1000 |
---|---|---|
committer | Robbbert <Robbbert@users.noreply.github.com> | 2019-05-15 02:38:32 +1000 |
commit | 0e685cc2e71511036e83834059de87f02bf93cf0 (patch) | |
tree | b0c504bf84835ea98e4ec17f1a76e1e5a0c85e33 | |
parent | 5f187d283d7c5b4582f11d1d5c350d78789edb35 (diff) |
Microkit: Working machine. [Robbbert]
-rw-r--r-- | src/mame/drivers/microkit.cpp | 140 |
1 files changed, 94 insertions, 46 deletions
diff --git a/src/mame/drivers/microkit.cpp b/src/mame/drivers/microkit.cpp index c57c2ceb475..dda3d5ed972 100644 --- a/src/mame/drivers/microkit.cpp +++ b/src/mame/drivers/microkit.cpp @@ -1,5 +1,5 @@ // license:BSD-3-Clause -// copyright-holders:Curt Coder +// copyright-holders:Curt Coder, Robbbert /* RCA COSMAC Microkit @@ -7,36 +7,25 @@ http://www.vintagecomputer.net/browse_thread.cfm?id=511 Press CR or LF to get the * prompt. - Commands: + Commands (must be in UPPERcase): $Pxxxx - Jump to address xxxx ?Mxxxx yyyy - Dump memory starting at xxxx for yyyy bytes - !Mxxxx yy zz... - Write data (yy etc) to memory xxxx. Data gets entered when you - press the space after the data. + !Mxxxx yyzz... - Write data (yy etc) to memory xxxx onwards. There's no sound or storage facilities, therefore no software. - ToDo: - - No technical manual or schematic available, so the entire driver is bodgy guesswork. - - Address 0 needs to be read/writeable, otherwise the numbers you enter will get - internally corrupted. - - Address 8000 is IDL which hangs the system, so program counter is preset to 8001. - - The keyboard is hooked up serially, which is ok, but the output to the terminal - is rubbish, so parallel is used so you can at least see something. - - When you enter commands, you can't see what you're doing. - - When you enter numbers, they display as rubbish or act as control codes. They - internally work though. - - The computer looks like a rack-mount metal box with a rudimentary front panel. - Buttons are: Reset; Load; Run program; Run Utility - There is a RUN LED. - None of these items are emulated. - It also has a power switch and lamp, and a fuse. + The computer looks like a rack-mount metal box with a rudimentary front panel. + - Buttons are: Reset; Load; Run program; Run Utility + - There is a RUN LED. + - It also has a power switch and lamp, and a fuse. + - According to the schematic there are LEDs on every data, address and status line. *****************************************************************************************/ #include "emu.h" #include "cpu/cosmac/cosmac.h" #include "bus/rs232/rs232.h" -#include "machine/terminal.h" +#include "machine/cdp1852.h" class microkit_state : public driver_device @@ -44,13 +33,18 @@ class microkit_state : public driver_device public: microkit_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) + , m_a15(1) , m_maincpu(*this, "maincpu") + , m_rom(*this, "maincpu") , m_rs232(*this, "rs232") - , m_terminal(*this, "terminal") { } void microkit(machine_config &config); + DECLARE_INPUT_CHANGED_MEMBER(reset_button); + DECLARE_INPUT_CHANGED_MEMBER(runp_button); + DECLARE_INPUT_CHANGED_MEMBER(runu_button); + private: DECLARE_READ_LINE_MEMBER(clear_r); DECLARE_WRITE8_MEMBER(ram_w); @@ -59,63 +53,106 @@ private: void microkit_io(address_map &map); void microkit_mem(address_map &map); + virtual void machine_start() override; virtual void machine_reset() override; + std::unique_ptr<uint8_t[]> m_ram; uint8_t m_resetcnt; - uint8_t m_ram_data; + bool m_a15; required_device<cosmac_device> m_maincpu; + required_memory_region m_rom; required_device<rs232_port_device> m_rs232; - required_device<generic_terminal_device> m_terminal; }; void microkit_state::microkit_mem(address_map &map) { - map(0x0000, 0x0000).rw(FUNC(microkit_state::ram_r), FUNC(microkit_state::ram_w)); - map(0x8000, 0x81ff).rom().region("maincpu", 0); - map(0x8200, 0x83ff).ram(); + map(0x0000, 0x01ff).rw(FUNC(microkit_state::ram_r),FUNC(microkit_state::ram_w)); + map(0x0200, 0x0fff).ram(); + map(0x8000, 0x81ff).rom().region("maincpu", 0); // CDP1832.U2 + map(0x8c00, 0x8c1f).ram(); // CDP1824.U3 "Register Storage" } void microkit_state::microkit_io(address_map &map) { - map(0x07, 0x07).nopw(); // writes a lots of zeros here + map(0x05, 0x05).r("u4", FUNC(cdp1852_device::read)).w("u4", FUNC(cdp1852_device::write)); // user output port + map(0x06, 0x06).r("u5", FUNC(cdp1852_device::read)).w("u5", FUNC(cdp1852_device::write)); // user input port + map(0x07, 0x07).nopw(); // writes lots of zeros here } static INPUT_PORTS_START( microkit ) + PORT_START("RESET") + PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RESET") PORT_CODE(KEYCODE_F3) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, reset_button, nullptr) + PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RUN P") PORT_CODE(KEYCODE_F2) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, runp_button, nullptr) + PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RUN U") PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, runu_button, nullptr) INPUT_PORTS_END +INPUT_CHANGED_MEMBER(microkit_state::reset_button) +{ + m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE); + m_resetcnt = 0; +} + +INPUT_CHANGED_MEMBER(microkit_state::runp_button) +{ + m_a15 = 0; + m_resetcnt = 0; + m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE); +} + +INPUT_CHANGED_MEMBER(microkit_state::runu_button) +{ + m_a15 = 1; + m_resetcnt = 0; + m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE); +} + READ_LINE_MEMBER( microkit_state::clear_r ) { - if (m_resetcnt < 0x10) - m_maincpu->set_state_int(cosmac_device::COSMAC_R0, 0x8001); // skip IDL if (m_resetcnt < 0x20) m_resetcnt++; - // set reset pin to normal - return 1; + + if (m_resetcnt < 0x10) + return 0; + else + if (m_resetcnt == 0x1c) + m_a15 = 0; + + return 1; } READ8_MEMBER( microkit_state::ram_r ) { - return m_ram_data; + if (m_a15) + return m_rom->base()[offset]; + else + return m_ram[offset]; } WRITE8_MEMBER( microkit_state::ram_w ) { - m_ram_data = data; - if (data > 0 && data < 0x80) - m_terminal->write(data); + m_ram[offset] = data; } void microkit_state::machine_reset() { m_resetcnt = 0; - m_ram_data = 0; + m_maincpu->reset(); +} + +void microkit_state::machine_start() +{ + // Register save state + save_item(NAME(m_resetcnt)); + save_item(NAME(m_a15)); + m_ram = make_unique_clear<uint8_t[]>(0x200); + save_pointer(NAME(m_ram), 0x200); } static DEVICE_INPUT_DEFAULTS_START( serial_keyb ) DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_300 ) DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_300 ) DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 ) - DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 ) - DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE ) + DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 ) + DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_MARK ) DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_2 ) DEVICE_INPUT_DEFAULTS_END @@ -123,23 +160,34 @@ DEVICE_INPUT_DEFAULTS_END void microkit_state::microkit(machine_config &config) { // basic machine hardware - CDP1802(config, m_maincpu, 1750000); + CDP1802(config, m_maincpu, 2_MHz_XTAL); m_maincpu->set_addrmap(AS_PROGRAM, µkit_state::microkit_mem); m_maincpu->set_addrmap(AS_IO, µkit_state::microkit_io); m_maincpu->wait_cb().set_constant(1); m_maincpu->clear_cb().set(FUNC(microkit_state::clear_r)); + m_maincpu->q_cb().set(m_rs232, FUNC(rs232_port_device::write_txd)).invert(); /* video hardware */ - RS232_PORT(config, m_rs232, default_rs232_devices, "keyboard"); + RS232_PORT(config, m_rs232, default_rs232_devices, "terminal"); m_rs232->rxd_handler().set_inputline(m_maincpu, COSMAC_INPUT_LINE_EF4); - m_rs232->set_option_device_input_defaults("keyboard", DEVICE_INPUT_DEFAULTS_NAME(serial_keyb)); - GENERIC_TERMINAL(config, m_terminal, 0); + m_rs232->set_option_device_input_defaults("terminal", DEVICE_INPUT_DEFAULTS_NAME(serial_keyb)); + + cdp1852_device &u4(CDP1852(config, "u4")); + u4.mode_cb().set_constant(1); // output + + cdp1852_device &u5(CDP1852(config, "u5")); + u5.mode_cb().set_constant(0); // input } ROM_START( microkit ) - ROM_REGION( 0x200, "maincpu", ROMREGION_INVERT ) - ROM_LOAD( "3.2b", 0x000, 0x100, CRC(6799357e) SHA1(c46e3322b8b1b6534a7da04806be29fa265951b7) ) - ROM_LOAD( "4.2a", 0x100, 0x100, CRC(27267bad) SHA1(838df9be2dc175584a1a6ee1770039118e49482e) ) + ROM_REGION( 0x200, "maincpu", 0 ) + ROM_LOAD( "ut4.u2", 0x0000, 0x0200, CRC(ba642f8e) SHA1(8975a4c6a0bb699b53c753946aac54860054246a) ) + + // These are bad, with heaps of bugs + //ROM_REGION( 0x200, "maincpu", ROMREGION_INVERT ) + //ROM_LOAD( "3.2b", 0x000, 0x100, CRC(6799357e) SHA1(c46e3322b8b1b6534a7da04806be29fa265951b7) ) + //ROM_LOAD( "4.2a", 0x100, 0x100, CRC(27267bad) SHA1(838df9be2dc175584a1a6ee1770039118e49482e) ) + ROM_END -COMP( 1975, microkit, 0, 0, microkit, microkit, microkit_state, empty_init, "RCA", "COSMAC Microkit", MACHINE_IS_SKELETON ) +COMP( 1975, microkit, 0, 0, microkit, microkit, microkit_state, empty_init, "RCA", "COSMAC Microkit", MACHINE_SUPPORTS_SAVE ) |