Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-22 16:31:49 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

bus/coco/dragon_serial: Fixed Rx/Tx clocks and removed cartridge autoboot.

Browse Source
This commit is contained in:
Nigel Barnes 2024-02-17 19:54:32 +00:00
parent 7d46eed853
commit 0a96285236
2 changed files with 48 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

110
src/devices/bus/coco/dragon_serial.cpp
View File

@ -8,17 +8,50 @@
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"
namespace {
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")
{
}
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; }
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
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;
private:
required_memory_region m_eprom;
required_device<acia6850_device> m_acia;
};
//-------------------------------------------------
// ROM( dragon_serial )
//-------------------------------------------------
@ -28,55 +61,11 @@ ROM_START(dragon_serial)
ROM_LOAD("comron_peaksoft.rom", 0x0000, 0x2000, CRC(9d18cf46) SHA1(14124dfb4bd78d1907e80d779cd7f3bae30564c9))
ROM_END
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(DRAGON_SERIAL, dragon_serial_device, "dragon_serial", "Dragon Peaksoft Prestel Module")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// 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")
const tiny_rom_entry *dragon_serial_device::device_rom_region() const
{
return ROM_NAME( dragon_serial );
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void dragon_serial_device::device_start()
{
set_line_value(line::CART, line_value::Q);
}
//-------------------------------------------------
// dragon_serial_device::get_cart_base
//-------------------------------------------------
u8 *dragon_serial_device::get_cart_base()
{
return m_eprom->base();
}
//-------------------------------------------------
// 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")

41
src/devices/bus/coco/dragon_serial.h
View File

@ -6,47 +6,8 @@
#pragma once
#include "cococart.h"
#include "machine/6850acia.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> dragon_serial_device
class dragon_serial_device :
public device_t,
public device_cococart_interface
{
public:
// construction/destruction
dragon_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
static constexpr feature_type imperfect_features() { return feature::COMMS; }
protected:
// device-level overrides
virtual void device_start() override;
virtual u8 *get_cart_base() override;
virtual memory_region *get_cart_memregion() override;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
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;
private:
void write_acia_clock(int state);
required_memory_region m_eprom;
required_device<acia6850_device> m_acia;
};
// device type definition
DECLARE_DEVICE_TYPE(DRAGON_SERIAL, dragon_serial_device)
DECLARE_DEVICE_TYPE(DRAGON_SERIAL, device_cococart_interface)
#endif // MAME_BUS_COCO_DRAGON_SERIAL_H