// 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<cpu_device> m_maincpu;
required_device<pit8253_device> m_pit;
required_device<i8251_device> m_usart;
required_device<rs232_port_device> m_rs232;
required_ioport_array<3> m_dsw;
required_ioport m_jumpers;
required_ioport m_cpu_speed;
required_region_ptr<u8> m_eprom;
required_shared_ptr<u8> 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 )