// license:BSD-3-Clause // copyright-holders:AJR /*************************************************************************** QT Computer Systems SBC +2/4 This looks like the same system as the Compu/Time SBC-880 Processor Board. Currently it crashes. There's a memory move routine at 50A4, and after a few turns it is told to move E603 bytes which corrupts everything. Chips: P8251, D8253C, MK3880N-4 (Z80). 3x 6-sw dips. Unmarked crystal. EPROM: D2716-2; RAM: 2x MM2114N-3L. A blue jumper marked 4M and 2M (between U11 and U12) selects the CPU clock. The RS232 port uses a 26-pin header (J1) rather than the conventional DB25 connector. The second 26-pin header (J2) is for the parallel port. Feature list from QT ad: - 1K RAM (which can be located at any 1K boundary) plus one each Parallel and Serial I/O ports on board - Power on jump to onboard EPROM (2708 or 2716) - EPROM addressable on any 1K or 2K boundary - Full 64K use of RAM allowed in shadow mode - Programmable Baud rate selection, 110-9600 - 2 or 4MHz switch selectable - DMA capability allows MWRT signal generation on CPU board or elsewhere in system under DMA logic or front panel control - Two programmable timers available for use by programs run with the SBC+2/4 (timer output and controls available at parallel I/O connector; parallel input and output ports available for use on CPU board). ****************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" #include "machine/i8251.h" #include "machine/pit8253.h" #include "bus/rs232/rs232.h" //#include "bus/s100/s100.h" class qtsbc_state : public driver_device { public: qtsbc_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_pit(*this, "pit") , m_usart(*this, "usart") , m_rs232(*this, "rs232") , m_dsw(*this, "DSW%u", 1) , m_jumpers(*this, "JUMPERS") , m_cpu_speed(*this, "SPEED") , m_eprom(*this, "maincpu") , m_p_ram(*this, "ram") , m_rts(true) { } void qtsbc(machine_config &config); void io_map(address_map &map); void mem_map(address_map &map); private: DECLARE_READ8_MEMBER(memory_r); DECLARE_WRITE8_MEMBER(memory_w); DECLARE_READ8_MEMBER(io_r); DECLARE_WRITE8_MEMBER(io_w); DECLARE_WRITE_LINE_MEMBER(rts_loopback_w); virtual void machine_start() override; virtual void machine_reset() override; required_device m_maincpu; required_device m_pit; required_device m_usart; required_device m_rs232; required_ioport_array<3> m_dsw; required_ioport m_jumpers; required_ioport m_cpu_speed; required_region_ptr m_eprom; required_shared_ptr m_p_ram; bool m_power_on; bool m_rts; }; READ8_MEMBER(qtsbc_state::memory_r) { ioport_value jumpers = m_jumpers->read(); ioport_value dsw3 = m_dsw[2]->read(); bool eprom_addressed = (offset & (BIT(jumpers, 2) ? 0xf800 : 0xfc00)) >> 10 == dsw3; if (eprom_addressed && !machine().side_effects_disabled()) m_power_on = false; if ((m_power_on && !BIT(jumpers, 1)) || (eprom_addressed && !BIT(jumpers, 0))) { offset &= BIT(jumpers, 2) ? 0x07ff : 0x03ff; return m_eprom[offset]; } #ifdef NOT_IMPLEMENTED_CURRENTLY else if ((offset & 0xfc00) >> 10 == m_dsw[1]->read()) { offset &= 0x03ff; return m_ram[offset]; } #endif else { if (offset == 0xe377) return 0x80; // TODO: S-100 bus return m_p_ram[offset]; } } WRITE8_MEMBER(qtsbc_state::memory_w) { #ifdef NOT_IMPLEMENTED_CURRENTLY if ((offset & 0xfc00) >> 10 == m_dsw[1]->read()) { offset &= 0x03ff; m_ram[offset] = data; } else #endif { // TODO: S-100 bus m_p_ram[offset] = data; } } READ8_MEMBER(qtsbc_state::io_r) { if ((offset & 0xf8) >> 3 == (m_dsw[0]->read() & 0x1f)) { switch (offset & 7) { case 0: case 1: case 2: case 3: default: return m_pit->read(space, offset & 3); case 4: case 5: // TODO: 8-bit parallel input port return 0xff; case 6: return m_usart->data_r(space, 0); case 7: return m_usart->status_r(space, 0); } } else { // TODO: S-100 bus (no address mirroring) logerror("Input from %04X\n", offset); // Ports 40 and 43 are for some sort of off-board RAM // Bit 0 of 43 is some sort of busy signal; bits 1-3 select some memory size factor if ((offset & 0xff) == 0x43) return 0x00; // Ports 08, 10 and 80 also used for read access return 0xff; } } WRITE8_MEMBER(qtsbc_state::io_w) { if ((offset & 0x00f8) >> 3 == (m_dsw[0]->read() & 0x1f)) { switch (offset & 7) { case 0: case 1: case 2: case 3: default: m_pit->write(space, offset & 3, data); break; case 4: case 5: // TODO: 8-bit parallel output port break; case 6: m_usart->data_w(space, 0, data); break; case 7: m_usart->control_w(space, 0, data); break; } } else { // TODO: S-100 bus (no address mirroring) logerror("Output %02X to %04X\n", data, offset); } } WRITE_LINE_MEMBER(qtsbc_state::rts_loopback_w) { // Filtered through this routine to avoid infinite loops if (state != bool(m_rts)) { m_rts = state; m_rs232->write_rts(m_rts); } } void qtsbc_state::mem_map(address_map &map) { map.unmap_value_high(); map(0x0000, 0xffff).ram().share("ram"); map(0x0000, 0xffff).rw(this, FUNC(qtsbc_state::memory_r), FUNC(qtsbc_state::memory_w)); } void qtsbc_state::io_map(address_map &map) { map.unmap_value_high(); map(0x0000, 0xffff).rw(this, FUNC(qtsbc_state::io_r), FUNC(qtsbc_state::io_w)); } /* Input ports */ static INPUT_PORTS_START( qtsbc ) PORT_START("DSW1") PORT_DIPNAME(0x1f, 0x00, "On-Board I/O Ports") PORT_DIPLOCATION("SW1:1,2,3,4,5") PORT_DIPSETTING(0x00, "00-07") PORT_DIPSETTING(0x01, "08-0F") PORT_DIPSETTING(0x02, "10-17") PORT_DIPSETTING(0x03, "18-1F") PORT_DIPSETTING(0x04, "20-27") PORT_DIPSETTING(0x05, "28-2F") PORT_DIPSETTING(0x06, "30-37") PORT_DIPSETTING(0x07, "38-3F") PORT_DIPSETTING(0x08, "40-47") PORT_DIPSETTING(0x09, "48-4F") PORT_DIPSETTING(0x0a, "50-57") PORT_DIPSETTING(0x0b, "58-5F") PORT_DIPSETTING(0x0c, "60-67") PORT_DIPSETTING(0x0d, "68-6F") PORT_DIPSETTING(0x0e, "70-77") PORT_DIPSETTING(0x0f, "78-7F") PORT_DIPSETTING(0x10, "80-87") PORT_DIPSETTING(0x11, "88-8F") PORT_DIPSETTING(0x12, "90-87") PORT_DIPSETTING(0x13, "98-9F") PORT_DIPSETTING(0x14, "A0-A7") PORT_DIPSETTING(0x15, "A8-AF") PORT_DIPSETTING(0x16, "B0-B7") PORT_DIPSETTING(0x17, "B8-BF") PORT_DIPSETTING(0x18, "C0-C7") PORT_DIPSETTING(0x19, "C8-CF") PORT_DIPSETTING(0x1a, "D0-D7") PORT_DIPSETTING(0x1b, "D8-DF") PORT_DIPSETTING(0x1c, "E0-E7") PORT_DIPSETTING(0x1d, "E8-EF") PORT_DIPSETTING(0x1e, "F0-F7") PORT_DIPSETTING(0x1f, "F8-FF") PORT_DIPUNUSED(0x20, 0x20) PORT_DIPLOCATION("SW1:6") PORT_START("DSW2") PORT_DIPNAME(0x3f, 0x37, "On-Board RAM Address") PORT_DIPLOCATION("SW2:6,5,4,3,2,1") PORT_DIPSETTING(0x00, "0000-03FF") PORT_DIPSETTING(0x01, "0400-07FF") PORT_DIPSETTING(0x02, "0800-0BFF") PORT_DIPSETTING(0x03, "0C00-0FFF") PORT_DIPSETTING(0x04, "1000-13FF") PORT_DIPSETTING(0x05, "1400-17FF") PORT_DIPSETTING(0x06, "1800-1BFF") PORT_DIPSETTING(0x07, "1C00-1FFF") PORT_DIPSETTING(0x08, "2000-23FF") PORT_DIPSETTING(0x09, "2400-27FF") PORT_DIPSETTING(0x0a, "2800-2BFF") PORT_DIPSETTING(0x0b, "2C00-2FFF") PORT_DIPSETTING(0x0c, "3000-33FF") PORT_DIPSETTING(0x0d, "3400-37FF") PORT_DIPSETTING(0x0e, "3800-3BFF") PORT_DIPSETTING(0x0f, "3C00-3FFF") PORT_DIPSETTING(0x10, "4000-43FF") PORT_DIPSETTING(0x11, "4400-47FF") PORT_DIPSETTING(0x12, "4800-4BFF") PORT_DIPSETTING(0x13, "4C00-4FFF") PORT_DIPSETTING(0x14, "5000-53FF") PORT_DIPSETTING(0x15, "5400-57FF") PORT_DIPSETTING(0x16, "5800-5BFF") PORT_DIPSETTING(0x17, "5C00-5FFF") PORT_DIPSETTING(0x18, "6000-63FF") PORT_DIPSETTING(0x19, "6400-67FF") PORT_DIPSETTING(0x1a, "6800-6BFF") PORT_DIPSETTING(0x1b, "6C00-6FFF") PORT_DIPSETTING(0x1c, "7000-73FF") PORT_DIPSETTING(0x1d, "7400-77FF") PORT_DIPSETTING(0x1e, "7800-7BFF") PORT_DIPSETTING(0x1f, "7C00-7FFF") PORT_DIPSETTING(0x20, "8000-83FF") PORT_DIPSETTING(0x21, "8400-87FF") PORT_DIPSETTING(0x22, "8800-8BFF") PORT_DIPSETTING(0x23, "8C00-8FFF") PORT_DIPSETTING(0x24, "9000-93FF") PORT_DIPSETTING(0x25, "9400-97FF") PORT_DIPSETTING(0x26, "9800-9BFF") PORT_DIPSETTING(0x27, "9C00-9FFF") PORT_DIPSETTING(0x28, "A000-A3FF") PORT_DIPSETTING(0x29, "A400-A7FF") PORT_DIPSETTING(0x2a, "A800-ABFF") PORT_DIPSETTING(0x2b, "AC00-AFFF") PORT_DIPSETTING(0x2c, "B000-B3FF") PORT_DIPSETTING(0x2d, "B400-B7FF") PORT_DIPSETTING(0x2e, "B800-BBFF") PORT_DIPSETTING(0x2f, "BC00-BFFF") PORT_DIPSETTING(0x30, "C000-C3FF") PORT_DIPSETTING(0x31, "C400-C7FF") PORT_DIPSETTING(0x32, "C800-CBFF") PORT_DIPSETTING(0x33, "CC00-CFFF") PORT_DIPSETTING(0x34, "D000-D3FF") PORT_DIPSETTING(0x35, "D400-D7FF") PORT_DIPSETTING(0x36, "D800-DBFF") PORT_DIPSETTING(0x37, "DC00-DFFF") PORT_DIPSETTING(0x38, "E000-E3FF") PORT_DIPSETTING(0x39, "E400-E7FF") PORT_DIPSETTING(0x3a, "E800-EBFF") PORT_DIPSETTING(0x3b, "EC00-EFFF") PORT_DIPSETTING(0x3c, "F000-F3FF") PORT_DIPSETTING(0x3d, "F400-F7FF") PORT_DIPSETTING(0x3e, "F800-FBFF") PORT_DIPSETTING(0x3f, "FC00-FFFF") PORT_START("DSW3") PORT_DIPNAME(0x3f, 0x14, "On-Board EPROM Address") PORT_DIPLOCATION("SW3:6,5,4,3,2,1") PORT_DIPSETTING(0x00, "0000-03FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x01, "0400-07FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x02, "0800-0BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x03, "0C00-0FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x04, "1000-13FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x05, "1400-17FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x06, "1800-1BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x07, "1C00-1FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x08, "2000-23FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x09, "2400-27FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0a, "2800-2BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0b, "2C00-2FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0c, "3000-33FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0d, "3400-37FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0e, "3800-3BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x0f, "3C00-3FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x10, "4000-43FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x11, "4400-47FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x12, "4800-4BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x13, "4C00-4FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x14, "5000-53FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x15, "5400-57FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x16, "5800-5BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x17, "5C00-5FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x18, "6000-63FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x19, "6400-67FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1a, "6800-6BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1b, "6C00-6FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1c, "7000-73FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1d, "7400-77FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1e, "7800-7BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x1f, "7C00-7FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x20, "8000-83FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x21, "8400-87FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x22, "8800-8BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x23, "8C00-8FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x24, "9000-93FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x25, "9400-97FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x26, "9800-9BFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x27, "9C00-9FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x28, "A000-A3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x29, "A400-A7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2a, "A800-ABFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2b, "AC00-AFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2c, "B000-B3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2d, "B400-B7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2e, "B800-BBFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x2f, "BC00-BFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x30, "C000-C3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x31, "C400-C7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x32, "C800-CBFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x33, "CC00-CFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x34, "D000-D3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x35, "D400-D7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x36, "D800-DBFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x37, "DC00-DFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x38, "E000-E3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x39, "E400-E7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3a, "E800-EBFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3b, "EC00-EFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3c, "F000-F3FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3d, "F400-F7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3e, "F800-FBFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x3f, "FC00-FFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x00) PORT_DIPSETTING(0x00, "0000-07FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x02, "0800-0FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x04, "1000-17FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x06, "1800-1FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x08, "2000-27FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x0a, "2800-2FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x0c, "3000-37FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x0e, "3800-3FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x10, "4000-47FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x12, "4800-4FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x14, "5000-57FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x16, "5800-5FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x18, "6000-67FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x1a, "6800-6FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x1c, "7000-77FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x1e, "7800-7FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x20, "8000-87FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x22, "8800-8FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x24, "9000-97FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x26, "9800-9FFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x28, "A000-A7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x2a, "A800-AFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x2c, "B000-B7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x2e, "B800-BFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x30, "C000-C7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x32, "C800-CFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x34, "D000-D7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x36, "D800-DFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x38, "E000-E7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x3a, "E800-EFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x3c, "F000-F7FF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_DIPSETTING(0x3e, "F800-FFFF") PORT_CONDITION("JUMPERS", 0x04, EQUALS, 0x04) PORT_START("JUMPERS") PORT_DIPNAME(0x02, 0x00, "Power-On Jump") PORT_DIPLOCATION("T to U:1") PORT_DIPSETTING(0x02, DEF_STR(Off)) // T to U open PORT_DIPSETTING(0x00, DEF_STR(On)) // T to U shorted PORT_DIPNAME(0x01, 0x01, "EPROM Phantom Mode") PORT_DIPLOCATION("Q to R:1") PORT_CONDITION("JUMPERS", 0x02, EQUALS, 0x00) PORT_DIPSETTING(0x00, DEF_STR(Off)) // Q to R shorted PORT_DIPSETTING(0x01, DEF_STR(On)) // Q to R open PORT_DIPNAME(0x01, 0x00, "On-Board EPROM") PORT_DIPLOCATION("Q to R:1") PORT_CONDITION("JUMPERS", 0x02, EQUALS, 0x02) PORT_DIPSETTING(0x01, "Disabled") // Q to R open PORT_DIPSETTING(0x00, "Enabled") // Q to R shorted PORT_DIPNAME(0x04, 0x04, "On-Board EPROM Size") PORT_DIPLOCATION("P to O:1") PORT_DIPSETTING(0x00, "1K x 8 (2708)") // P to O shorted PORT_DIPSETTING(0x04, "2K x 8 (2716)") // P to O open PORT_START("SPEED") PORT_CONFNAME(0x01, 0x01, "CPU Speed") PORT_CONFSETTING(0x00, "2 MHz") PORT_CONFSETTING(0x01, "4 MHz") INPUT_PORTS_END void qtsbc_state::machine_start() { m_usart->write_cts(0); save_item(NAME(m_power_on)); save_item(NAME(m_rts)); } void qtsbc_state::machine_reset() { m_power_on = true; m_maincpu->set_unscaled_clock(BIT(m_cpu_speed->read(), 0) ? 4_MHz_XTAL : 4_MHz_XTAL / 2); } static DEVICE_INPUT_DEFAULTS_START( terminal ) DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_9600 ) DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_9600 ) DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 ) DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 ) DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_EVEN ) DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 ) DEVICE_INPUT_DEFAULTS_END MACHINE_CONFIG_START(qtsbc_state::qtsbc) /* basic machine hardware */ MCFG_DEVICE_ADD("maincpu", Z80, 4_MHz_XTAL) // Mostek MK3880 MCFG_DEVICE_PROGRAM_MAP(mem_map) MCFG_DEVICE_IO_MAP(io_map) /* video hardware */ MCFG_DEVICE_ADD("pit", PIT8253, 0) // U9 MCFG_PIT8253_CLK0(4_MHz_XTAL / 2) /* Timer 0: baud rate gen for 8251 */ MCFG_PIT8253_OUT0_HANDLER(WRITELINE("usart", i8251_device, write_txc)) MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("usart", i8251_device, write_rxc)) MCFG_PIT8253_CLK1(4_MHz_XTAL / 2) MCFG_PIT8253_OUT1_HANDLER(WRITELINE("pit", pit8253_device, write_clk2)) MCFG_DEVICE_ADD("usart", I8251, 0) // U8 MCFG_I8251_TXD_HANDLER(WRITELINE("rs232", rs232_port_device, write_txd)) MCFG_DEVICE_ADD("rs232", RS232_PORT, default_rs232_devices, "terminal") MCFG_RS232_RXD_HANDLER(WRITELINE("usart", i8251_device, write_rxd)) MCFG_RS232_DSR_HANDLER(WRITELINE("usart", i8251_device, write_dsr)) // actually from pin 11, "Reverse Channel Transmit" MCFG_RS232_CTS_HANDLER(WRITELINE(*this, qtsbc_state, rts_loopback_w)) MCFG_RS232_DCD_HANDLER(WRITELINE("rs232", rs232_port_device, write_dtr)) MCFG_SLOT_OPTION_DEVICE_INPUT_DEFAULTS("terminal", terminal) // must be exactly here MACHINE_CONFIG_END /* ROM definition */ ROM_START( qtsbc ) ROM_REGION( 0x0800, "maincpu", ROMREGION_ERASEFF ) ROM_LOAD( "qtsbc.u23", 0x0000, 0x0800, CRC(823fd942) SHA1(64c4f74dd069ae4d43d301f5e279185f32a1efa0)) ROM_END /* Driver */ // YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS COMP( 19??, qtsbc, 0, 0, qtsbc, qtsbc, qtsbc_state, empty_init, "QT Computer Systems Inc.", "SBC + 2/4", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )