// license:GPL-2.0+ // copyright-holders:Dirk Best /*************************************************************************** Dick Smith VZ-200/300 RS-232 Cartridge (K-6317) ***************************************************************************/ #include "emu.h" #include "rs232.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(VTECH_RS232_INTERFACE, vtech_rs232_interface_device, "vtech_rs232", "DSE VZ-200/300 RS-232 Interface") //------------------------------------------------- // mem_map - memory space address map //------------------------------------------------- void vtech_rs232_interface_device::mem_map(address_map &map) { map.unmap_value_high(); map(0x4000, 0x47ff).rom().region("software", 0); map(0x5000, 0x5000).mirror(0x7ff).r(FUNC(vtech_rs232_interface_device::receive_data_r)); map(0x5800, 0x5800).mirror(0x7ff).w(FUNC(vtech_rs232_interface_device::transmit_data_w)); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- ROM_START( rs232 ) ROM_REGION(0x800, "software", 0) ROM_DEFAULT_BIOS("16") ROM_SYSTEM_BIOS(0, "15", "Version 1.5") // 1985 ROMX_LOAD("rs232_v15.ic2", 0x000, 0x800, CRC(6545260d) SHA1(4042f6f1e09e383f3c92f628c6187dc5f072fdb2), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "16", "Version 1.6") // 1987 ROMX_LOAD("rs232_v16.ic2", 0x000, 0x800, CRC(d761fc79) SHA1(28e00c7ff33143a948308330859bee54b474e114), ROM_BIOS(1)) ROM_END const tiny_rom_entry *vtech_rs232_interface_device::device_rom_region() const { return ROM_NAME( rs232 ); } //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void vtech_rs232_interface_device::device_add_mconfig(machine_config &config) { vtech_memexp_device::device_add_mconfig(config); RS232_PORT(config, m_rs232, default_rs232_devices, nullptr); m_rs232->rxd_handler().set([this](int state) { m_rx = state; }); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // vtech_rs232_interface_device - constructor //------------------------------------------------- vtech_rs232_interface_device::vtech_rs232_interface_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : vtech_memexp_device(mconfig, VTECH_RS232_INTERFACE, tag, owner, clock), m_rs232(*this, "rs232"), m_rx(1) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void vtech_rs232_interface_device::device_start() { vtech_memexp_device::device_start(); // register for save states save_item(NAME(m_rx)); } //************************************************************************** // IMPLEMENTATION //************************************************************************** uint8_t vtech_rs232_interface_device::receive_data_r() { return 0x7f | (m_rx << 7); } void vtech_rs232_interface_device::transmit_data_w(uint8_t data) { m_rs232->write_txd(!BIT(data, 7)); }