// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** Power Software Joystick Interface **********************************************************************/ #include "emu.h" #include "pwrjoy.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(ELECTRON_PWRJOY, electron_pwrjoy_device, "electron_pwrjoy", "Power Software Joystick Interface") ROM_START( pwrjoy ) // Bank 12 Expansion module operating system ROM_REGION(0x2000, "exp_rom", 0) ROM_LOAD("power_joystick.rom", 0x0000, 0x2000, CRC(44fb9360) SHA1(6d3aa85a436db952906e84839496e681ea115168)) ROM_END static INPUT_PORTS_START( pwrjoy ) PORT_START("JOY") PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP) PORT_8WAY PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN) PORT_8WAY PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT) PORT_8WAY PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT) PORT_8WAY PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("Fire") INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor electron_pwrjoy_device::device_input_ports() const { return INPUT_PORTS_NAME( pwrjoy ); } const tiny_rom_entry *electron_pwrjoy_device::device_rom_region() const { return ROM_NAME( pwrjoy ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // electron_pwrjoy_device - constructor //------------------------------------------------- electron_pwrjoy_device::electron_pwrjoy_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, ELECTRON_PWRJOY, tag, owner, clock) , device_electron_expansion_interface(mconfig, *this) , m_exp_rom(*this, "exp_rom") , m_joy(*this, "JOY") , m_romsel(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void electron_pwrjoy_device::device_start() { } //------------------------------------------------- // expbus_r - expansion data read //------------------------------------------------- uint8_t electron_pwrjoy_device::expbus_r(offs_t offset) { uint8_t data = 0xff; if (offset >= 0x8000 && offset < 0xc000) { if (m_romsel == 15) { data = m_exp_rom->base()[offset & 0x1fff]; } } else if (offset == 0xfcc0) { data = m_joy->read() | 0xe0; } return data; } //------------------------------------------------- // expbus_w - expansion data write //------------------------------------------------- void electron_pwrjoy_device::expbus_w(offs_t offset, uint8_t data) { if (offset == 0xfe05) { m_romsel = data & 0x0f; } }