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Diffstat (limited to 'src/mame/trs/agvision.cpp')
-rw-r--r-- | src/mame/trs/agvision.cpp | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/src/mame/trs/agvision.cpp b/src/mame/trs/agvision.cpp new file mode 100644 index 00000000000..c96052050a0 --- /dev/null +++ b/src/mame/trs/agvision.cpp @@ -0,0 +1,407 @@ +// license:BSD-3-Clause +// copyright-holders: tim lindner +/*************************************************************************** + + Elanco AgVision and Radio Shack VideoTex terminals + + Dynamic RAM (16 or 4k) starts at $0000. + ROM (2K) starts at $A000 and mirrors up to $BFFF + Static RAM starts at $C000 for 128 bytes + The PIA data port a is at $FF1C + control port a is at $FF1D + data port b is at $FF1E + control port b is at $FF1F + + The Control Register (flip flop) is at $FF20 + The SAM starts at $FFC0 + + PIA: + Port A and B make up the keyboard matrix + PA7 - RS-232 receive. + CA1 - The horizontal sync from the VDG. + CA2 - Unconnected, not verified. + CB1 - Modem status, carrier detect. + CB2 - Modem control (unverified). + IRQA - Connected to the 6809 FIRQ. + IRQB - Unconnected, not verified. + + Control Register: + Bit 7 - RS-232 transmit. + Bit 6 - RS-232 DTR, or activity LED (unsure which). + Bit 5 - unconnected (not verified). + Bit 3 - VDG GM0. + Bit 2 - VDG GM1. + Bit 1 - VDG GM2. + Bit 0 - VDG A* / G. + + Reverse engineering used with permission of George Phillips of the + trs80gp emulator. + +***************************************************************************/ + +#include "emu.h" + +#include "bus/rs232/rs232.h" +#include "cpu/m6809/m6809.h" +#include "machine/6821pia.h" +#include "machine/6883sam.h" +#include "machine/ram.h" +#include "video/mc6847.h" +#include "screen.h" + +//------------------------------------------------- +// TYPE DEFINITIONS +//------------------------------------------------- + +namespace +{ + +class agvision_state : public driver_device +{ +public: + agvision_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag) + , m_maincpu(*this, "maincpu") + , m_screen(*this, "screen") + , m_ram(*this, "ram") + , m_pia_0(*this, "pia0") + , m_sam(*this, "sam") + , m_vdg(*this, "vdg") + , m_rs232(*this, "rs232") + , m_keyboard(*this, "row%u", 0) + {} + + void agvision(machine_config &config); + DECLARE_INPUT_CHANGED_MEMBER(hang_up); + +protected: + virtual void machine_start() override; + +private: + static constexpr int CD_DELAY = 250; + + required_device<cpu_device> m_maincpu; + required_device<screen_device> m_screen; + required_device<ram_device> m_ram; + required_device<pia6821_device> m_pia_0; + required_device<sam6883_device> m_sam; + required_device<mc6847_base_device> m_vdg; + required_device<rs232_port_device> m_rs232; + required_ioport_array<7> m_keyboard; + + emu_timer *m_timer; // Carrier Detect Timer + uint8_t sam_read(offs_t offset); + void mem_map(address_map &map); + void rom_map(address_map &map); + void static_ram_map(address_map &map); + void io0_map(address_map &map); + void io1_map(address_map &map); + void boot_map(address_map &map); + void ff20_write(offs_t offset, uint8_t data); + void configure_sam(); + uint8_t pia0_pa_r(); + void pia0_cb2_w(int state); + TIMER_CALLBACK_MEMBER(timer_elapsed); + + int m_cd; +}; + +//------------------------------------------------- +// INPUT_PORTS( agvision ) +//------------------------------------------------- + +static INPUT_PORTS_START( agvision ) + PORT_START("row0") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('@') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C') + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D') + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G') + + PORT_START("row1") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K') + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L') + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O') + + PORT_START("row2") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S') + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T') + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W') + + PORT_START("row3") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("UP") PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP)) + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("DOWN") PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN), 10) + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LEFT") PORT_CODE(KEYCODE_LEFT) PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(UCHAR_MAMEKEY(LEFT), 8) PORT_CHAR('[') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("RIGHT") PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT), 9) PORT_CHAR(']') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("SPACE") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ') + + PORT_START("row4") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0) PORT_CHAR('0') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('\"') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#') + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$') + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'') + + PORT_START("row5") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(') + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')') + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS) PORT_CHAR(':') PORT_CHAR('*') + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+') + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<') + PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('-') PORT_CHAR('=') + PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>') + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?') + + PORT_START("row6") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("ENTER") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CLEAR") PORT_CODE(KEYCODE_HOME) PORT_CHAR(12, UCHAR_SHIFT_2) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("BREAK") PORT_CODE(KEYCODE_END) PORT_CODE(KEYCODE_ESC) PORT_CHAR(27) + PORT_BIT(0x78, IP_ACTIVE_LOW, IPT_UNUSED) + PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("SHIFT") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1) + + PORT_START("hup") + PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("HUP") PORT_CODE(KEYCODE_TAB) PORT_CHANGED_MEMBER(DEVICE_SELF, agvision_state, agvision_state::hang_up, 0) +INPUT_PORTS_END + +//------------------------------------------------- +// DEVICE_INPUT_DEFAULTS_START( ag_modem ) +//------------------------------------------------- + +static DEVICE_INPUT_DEFAULTS_START( ag_modem ) + DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_300 ) + DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_300 ) + DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 ) + DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE ) + DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 ) +DEVICE_INPUT_DEFAULTS_END + +//------------------------------------------------- +// machine_config +//------------------------------------------------- + +void agvision_state::agvision(machine_config &config) +{ + // basic machine hardware + MC6809E(config, m_maincpu, XTAL(14'318'181) / 16); + m_maincpu->set_addrmap(AS_PROGRAM, &agvision_state::mem_map); + + PIA6821(config, m_pia_0); + m_pia_0->readpa_handler().set(FUNC(agvision_state::pia0_pa_r)); + m_pia_0->irqa_handler().set_inputline(m_maincpu, M6809_FIRQ_LINE); + m_pia_0->cb2_handler().set(FUNC(agvision_state::pia0_cb2_w)); + + // video hardware + SCREEN(config, m_screen, SCREEN_TYPE_RASTER); + + MC6847_NTSC(config, m_vdg, XTAL(14'318'181) / 4); // VClk output from MC6883 + m_vdg->set_screen(m_screen); + m_vdg->hsync_wr_callback().set(m_pia_0, FUNC(pia6821_device::ca1_w)); + m_vdg->input_callback().set(FUNC(agvision_state::sam_read)); + + // memory controller + SAM6883(config, m_sam, XTAL(14'318'181), m_maincpu); + m_sam->set_addrmap(2, &agvision_state::rom_map); // ROM at $A000 + m_sam->set_addrmap(3, &agvision_state::static_ram_map); // RAM at $C000 + m_sam->set_addrmap(4, &agvision_state::io0_map); // IO at $FF00 + m_sam->set_addrmap(5, &agvision_state::io1_map); // IO at $FF20 + m_sam->set_addrmap(7, &agvision_state::boot_map); // IO at $FF60 + + RS232_PORT(config, m_rs232, default_rs232_devices, "null_modem"); + m_rs232->set_option_device_input_defaults("null_modem", DEVICE_INPUT_DEFAULTS_NAME(ag_modem)); + + // internal ram + RAM(config, m_ram).set_default_size("16K").set_extra_options("4K"); +} + +//************************************************************************** +// ADDRESS MAPS +//************************************************************************** + +void agvision_state::mem_map(address_map &map) +{ + map(0x0000, 0xffff).rw(m_sam, FUNC(sam6883_device::read), FUNC(sam6883_device::write)); +} + +void agvision_state::rom_map(address_map &map) +{ + // $A000-$BFFF + map(0x0000, 0x07ff).rom().region("maincpu", 0x0000).nopw().mirror(0x1800); +} + +void agvision_state::static_ram_map(address_map &map) +{ + // $C000-$FEFF + map(0x0000, 0x0080).ram(); +} + +void agvision_state::io0_map(address_map &map) +{ + // $FF00-$FF1F + map(0x1c, 0x1f).rw("pia0", FUNC(pia6821_device::read), FUNC(pia6821_device::write)); +} + +void agvision_state::io1_map(address_map &map) +{ + // $FF20-$FF3F + map(0x00, 0x00).w(FUNC(agvision_state::ff20_write)); +} + +void agvision_state::boot_map(address_map &map) +{ + // $FF60-$FFEF + map(0x60, 0x7f).nopw(); // SAM Registers +} + +//------------------------------------------------- +// device_start +//------------------------------------------------- + +void agvision_state::machine_start() +{ + configure_sam(); + + save_item(NAME(m_cd)); + m_pia_0->cb1_w(0); + m_timer = timer_alloc(FUNC(agvision_state::timer_elapsed), this); + m_cd = 0; +} + +//------------------------------------------------- +// sam_read +//------------------------------------------------- + +uint8_t agvision_state::sam_read(offs_t offset) +{ + uint8_t data = m_sam->display_read(offset); + m_vdg->as_w(BIT(data,7)); + m_vdg->inv_w(BIT(data,6)); + return data; +} + +//------------------------------------------------- +// ff20_write +//------------------------------------------------- + +void agvision_state::ff20_write(offs_t offset, uint8_t data) +{ + m_rs232->write_txd(BIT(data,7)); + m_vdg->gm0_w(BIT(data,3)); + m_vdg->gm1_w(BIT(data,2)); + m_vdg->gm2_w(BIT(data,1)); + m_vdg->ag_w(BIT(data,0)); +} + +//------------------------------------------------- +// configure_sam +//------------------------------------------------- + +void agvision_state::configure_sam() +{ + offs_t ramsize = m_ram->size(); + m_sam->space(0).install_ram(0, ramsize - 1, m_ram->pointer()); + if (ramsize < 65536) + m_sam->space(0).nop_readwrite(ramsize, 0xffff); +} + +//------------------------------------------------- +// timer_elapsed +//------------------------------------------------- + +TIMER_CALLBACK_MEMBER(agvision_state::timer_elapsed) +{ + m_timer->adjust(attotime::from_usec(CD_DELAY)); + m_pia_0->cb1_w(m_cd); + m_cd = !m_cd; +} + +//------------------------------------------------- +// pia0_pa_r - keyboard handler +//------------------------------------------------- + +uint8_t agvision_state::pia0_pa_r() +{ + uint8_t pia0_pb = m_pia_0->b_output(); + + uint8_t pia0_pa = 0x7f; + + /* poll the keyboard, and update PA6-PA0 accordingly*/ + for (unsigned i = 0; i < m_keyboard.size(); i++) + { + int value = m_keyboard[i]->read(); + if ((value | pia0_pb) != 0xff) + { + pia0_pa &= ~(0x01 << i); + } + } + + pia0_pa |= (m_rs232->rxd_r() ? 0x80 : 0); + + return pia0_pa; +} + +//------------------------------------------------- +// hang_up +//------------------------------------------------- + +INPUT_CHANGED_MEMBER(agvision_state::hang_up) +{ + if (newval == 1) + { + m_timer->adjust(attotime::never); + } +} + +//------------------------------------------------- +// pia0_cb2_w +//------------------------------------------------- + +void agvision_state::pia0_cb2_w(int state) +{ + if (state == 1) + { + m_timer->adjust(attotime::from_usec(CD_DELAY*8000)); + } + else + { + m_timer->adjust(attotime::never); + } +} + +//************************************************************************** +// ROMS +//************************************************************************** + +ROM_START(agvision) + ROM_REGION(0xa000,"maincpu",0) + ROM_LOAD("8041716-1.1-agvision.u13", 0x0000, 0x0800, CRC(5b11b13e) SHA1(896e68f90ed57e0921887e717fc92eda067a210d)) +ROM_END + +ROM_START(trsvidtx) + ROM_REGION(0xa000,"maincpu",0) + ROM_LOAD("8041716-1.1-videotex.u13", 0x0000, 0x0800, CRC(821a59bb) SHA1(e3643f27fcf8287c0bc0f66b21554dc988ded9c1)) +ROM_END + +} // anonymous namespace + +// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS +COMP( 1979, agvision, 0, 0, agvision, agvision, agvision_state, empty_init, "Elanco", "AgVision", MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND_HW ) +COMP( 1980, trsvidtx, 0, 0, agvision, agvision, agvision_state, empty_init, "Tandy Radio Shack", "Videotex", MACHINE_SUPPORTS_SAVE | MACHINE_NO_SOUND_HW ) |