diff options
Diffstat (limited to 'src/devices/bus/coco/dragon_serial.cpp')
-rw-r--r-- | src/devices/bus/coco/dragon_serial.cpp | 106 |
1 files changed, 45 insertions, 61 deletions
diff --git a/src/devices/bus/coco/dragon_serial.cpp b/src/devices/bus/coco/dragon_serial.cpp index cb9127959b5..c2ecab858d8 100644 --- a/src/devices/bus/coco/dragon_serial.cpp +++ b/src/devices/bus/coco/dragon_serial.cpp @@ -8,75 +8,64 @@ includes a through port for DOS cartridges. TODO: - - RX/TX rate set by dipswitches (default 100001/001001?), for use with a 1200/75 modem. - add throughport, not known how CTS/SCS lines are switched between slots. ***************************************************************************/ #include "emu.h" #include "dragon_serial.h" +#include "machine/6850acia.h" #include "machine/clock.h" #include "bus/rs232/rs232.h" -//------------------------------------------------- -// ROM( dragon_serial ) -//------------------------------------------------- +namespace { -ROM_START(dragon_serial) - ROM_REGION(0x2000, "eprom", 0) - ROM_LOAD("comron_peaksoft.rom", 0x0000, 0x2000, CRC(9d18cf46) SHA1(14124dfb4bd78d1907e80d779cd7f3bae30564c9)) -ROM_END +class dragon_serial_device : public device_t, public device_cococart_interface +{ +public: + dragon_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, DRAGON_SERIAL, tag, owner, clock) + , device_cococart_interface(mconfig, *this ) + , m_eprom(*this, "eprom") + , m_acia(*this, "acia") + { + } -//************************************************************************** -// GLOBAL VARIABLES -//************************************************************************** +protected: + // device_t overrides + virtual void device_start() override { } + virtual u8 *get_cart_base() override { return m_eprom->base(); } + virtual memory_region *get_cart_memregion() override { return m_eprom; } -DEFINE_DEVICE_TYPE(DRAGON_SERIAL, dragon_serial_device, "dragon_serial", "Dragon Peaksoft Prestel Module") + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; + virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD; + virtual u8 cts_read(offs_t offset) override; + virtual u8 scs_read(offs_t offset) override; + virtual void scs_write(offs_t offset, u8 data) override; -//************************************************************************** -// LIVE DEVICE -//************************************************************************** +private: + required_memory_region m_eprom; + required_device<acia6850_device> m_acia; +}; -//------------------------------------------------- -// dragon_serial_device - constructor -//------------------------------------------------- - -dragon_serial_device::dragon_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) - : device_t(mconfig, DRAGON_SERIAL, tag, owner, clock) - , device_cococart_interface(mconfig, *this ) - , m_eprom(*this, "eprom") - , m_acia(*this, "acia") -{ -} //------------------------------------------------- -// device_start - device-specific startup +// ROM( dragon_serial ) //------------------------------------------------- -void dragon_serial_device::device_start() -{ - set_line_value(line::CART, line_value::Q); -} - -//------------------------------------------------- -// dragon_serial_device::get_cart_base -//------------------------------------------------- +ROM_START(dragon_serial) + ROM_REGION(0x2000, "eprom", 0) + ROM_LOAD("comron_peaksoft.rom", 0x0000, 0x2000, CRC(9d18cf46) SHA1(14124dfb4bd78d1907e80d779cd7f3bae30564c9)) +ROM_END -u8 *dragon_serial_device::get_cart_base() +const tiny_rom_entry *dragon_serial_device::device_rom_region() const { - return m_eprom->base(); + return ROM_NAME( dragon_serial ); } -//------------------------------------------------- -// dragon_serial_device::get_cart_memregion -//------------------------------------------------- - -memory_region *dragon_serial_device::get_cart_memregion() -{ - return m_eprom; -} //------------------------------------------------- // device_add_mconfig - add device configuration @@ -89,23 +78,18 @@ void dragon_serial_device::device_add_mconfig(machine_config &config) m_acia->rts_handler().set("rs232", FUNC(rs232_port_device::write_rts)); m_acia->irq_handler().set([this](int state) { set_line_value(line::NMI, state); }); - clock_device &acia_clock(CLOCK(config, "acia_clock", 2.4576_MHz_XTAL)); - acia_clock.signal_handler().set(FUNC(dragon_serial_device::write_acia_clock)); + clock_device &rx_clock(CLOCK(config, "rx_clock", 2.4576_MHz_XTAL / 32)); // 1200 baud + rx_clock.signal_handler().set(m_acia, FUNC(acia6850_device::write_rxc)); + + clock_device &tx_clock(CLOCK(config, "tx_clock", 2.4576_MHz_XTAL / 512)); // 75 baud + tx_clock.signal_handler().set(m_acia, FUNC(acia6850_device::write_txc)); rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, "null_modem")); rs232.rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd)); rs232.cts_handler().set(m_acia, FUNC(acia6850_device::write_cts)); - rs232.dcd_handler().set(m_acia, FUNC(acia6850_device::write_dcd)); + rs232.dcd_handler().set(m_acia, FUNC(acia6850_device::write_dcd)).invert(); } -//------------------------------------------------- -// rom_region - device-specific ROM region -//------------------------------------------------- - -const tiny_rom_entry *dragon_serial_device::device_rom_region() const -{ - return ROM_NAME( dragon_serial ); -} //------------------------------------------------- // cts_read @@ -130,6 +114,7 @@ u8 dragon_serial_device::scs_read(offs_t offset) result = m_acia->read(offset & 1); break; } + return result; } @@ -147,8 +132,7 @@ void dragon_serial_device::scs_write(offs_t offset, u8 data) } } -void dragon_serial_device::write_acia_clock(int state) -{ - m_acia->write_txc(state); - m_acia->write_rxc(state); -} +} // anonymous namespace + + +DEFINE_DEVICE_TYPE_PRIVATE(DRAGON_SERIAL, device_cococart_interface, dragon_serial_device, "dragon_serial", "Dragon Peaksoft Prestel Module") |