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Diffstat (limited to 'src/devices/bus/coco/dragon_serial.cpp')
-rw-r--r--src/devices/bus/coco/dragon_serial.cpp106
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")