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path: root/src/devices/bus/coco/coco_rs232.cpp
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// license:BSD-3-Clause
// copyright-holders:Nathan Woods
/***************************************************************************

    coco_rs232.cpp

    Code for emulating the CoCo Deluxe RS-232 PAK

***************************************************************************/

#include "emu.h"
#include "coco_rs232.h"

#include "cococart.h"
#include "machine/mos6551.h"
#include "bus/rs232/rs232.h"


/***************************************************************************
    CONSTANTS
***************************************************************************/

#define UART_TAG        "uart"
#define PORT_TAG        "port"

//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

// ======================> coco_rs232_device

namespace
{
	class coco_rs232_device :
		public device_t,
		public device_cococart_interface
	{
	public:
		// construction/destruction
		coco_rs232_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
			: device_t(mconfig, COCO_RS232, tag, owner, clock)
			, device_cococart_interface(mconfig, *this)
			, m_uart(*this, UART_TAG)
		{
		}

		// optional information overrides
		virtual void device_add_mconfig(machine_config &config) override;

		WRITE_LINE_MEMBER(uart_irq_w)
		{
			set_line_value(line::CART, state != 0);
		}

	protected:
		// device-level overrides
		virtual void device_start() override
		{
			install_readwrite_handler(0xFF68, 0xFF6B,
				read8_delegate(FUNC(mos6551_device::read), (mos6551_device *)m_uart),
				write8_delegate(FUNC(mos6551_device::write), (mos6551_device *)m_uart));
		}

		virtual const tiny_rom_entry *device_rom_region() const override;

		// CoCo cartridge level overrides
		virtual uint8_t *get_cart_base() override
		{
			return memregion("eprom")->base();
		}

	private:
		// internal state
		required_device<mos6551_device> m_uart;
	};
};


/***************************************************************************
IMPLEMENTATION
***************************************************************************/

MACHINE_CONFIG_START(coco_rs232_device::device_add_mconfig)
	MCFG_DEVICE_ADD(UART_TAG, MOS6551, 0)
	MCFG_MOS6551_XTAL(XTAL(1'843'200))

	MCFG_MOS6551_IRQ_HANDLER(WRITELINE(coco_rs232_device, uart_irq_w))
	MCFG_MOS6551_TXD_HANDLER(DEVWRITELINE(PORT_TAG, rs232_port_device, write_txd))

	MCFG_RS232_PORT_ADD(PORT_TAG, default_rs232_devices, nullptr)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(UART_TAG, mos6551_device, write_rxd))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(UART_TAG, mos6551_device, write_dcd))
	MCFG_RS232_DSR_HANDLER(DEVWRITELINE(UART_TAG, mos6551_device, write_dsr))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(UART_TAG, mos6551_device, write_cts))
MACHINE_CONFIG_END

ROM_START(coco_rs232_device)
	ROM_REGION(0x1000, "eprom", ROMREGION_ERASE00)
	ROM_LOAD("deluxe_rs-232_program_pak_1983_26-2226_tandy.rom", 0x0000, 0x1000, CRC(d990e1f9) SHA1(3fad25f3462a0b581b9c182ac11ad90c8fa08cb6))
ROM_END

//-------------------------------------------------
//  device_rom_region
//-------------------------------------------------

const tiny_rom_entry *coco_rs232_device::device_rom_region() const
{
	return ROM_NAME(coco_rs232_device);
}

//**************************************************************************
//  DEVICE DECLARATION
//**************************************************************************

DEFINE_DEVICE_TYPE(COCO_RS232, coco_rs232_device, "coco_rs232", "CoCo Deluxe RS-232 PAK")