// license:BSD-3-Clause // copyright-holders:Krzysztof Strzecha, Miodrag Milanovic /*************************************************************************** machine.c Functions to emulate general aspects of the machine (RAM, ROM, interrupts, I/O ports) ***************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" #include "includes/galaxy.h" /*************************************************************************** I/O devices ***************************************************************************/ uint8_t galaxy_state::keyboard_r(offs_t offset) { if (offset == 0) { double level = m_cassette->input(); return (level > 0) ? 0xfe : 0xff; } else return m_io_keyboard[(offset>>3) & 0x07]->read() & (0x01<<(offset & 0x07)) ? 0xfe : 0xff; } void galaxy_state::latch_w(uint8_t data) { double val = (((data >>6) & 1 ) + ((data >> 2) & 1) - 1) * 32000; m_latch_value = data; m_cassette->output(val); } /*************************************************************************** Interrupts ***************************************************************************/ IRQ_CALLBACK_MEMBER(galaxy_state::irq_callback) { set_timer(); m_interrupts_enabled = true; return 0xff; } /*************************************************************************** Snapshot files (GAL) ***************************************************************************/ #define GALAXY_SNAPSHOT_V1_SIZE 8268 #define GALAXY_SNAPSHOT_V2_SIZE 8244 void galaxy_state::setup_snapshot(const uint8_t * data, uint32_t size) { switch (size) { case GALAXY_SNAPSHOT_V1_SIZE: m_maincpu->set_state_int(Z80_AF, data[0x00] | data[0x01] << 8); m_maincpu->set_state_int(Z80_BC, data[0x04] | data[0x05] << 8); m_maincpu->set_state_int(Z80_DE, data[0x08] | data[0x09] << 8); m_maincpu->set_state_int(Z80_HL, data[0x0c] | data[0x0d] << 8); m_maincpu->set_state_int(Z80_IX, data[0x10] | data[0x11] << 8); m_maincpu->set_state_int(Z80_IY, data[0x14] | data[0x15] << 8); m_maincpu->set_state_int(Z80_PC, data[0x18] | data[0x19] << 8); m_maincpu->set_state_int(Z80_SP, data[0x1c] | data[0x1d] << 8); m_maincpu->set_state_int(Z80_AF2, data[0x20] | data[0x21] << 8); m_maincpu->set_state_int(Z80_BC2, data[0x24] | data[0x25] << 8); m_maincpu->set_state_int(Z80_DE2, data[0x28] | data[0x29] << 8); m_maincpu->set_state_int(Z80_HL2, data[0x2c] | data[0x2d] << 8); m_maincpu->set_state_int(Z80_IFF1, data[0x30]); m_maincpu->set_state_int(Z80_IFF2, data[0x34]); m_maincpu->set_state_int(Z80_HALT, data[0x38]); m_maincpu->set_state_int(Z80_IM, data[0x3c]); m_maincpu->set_state_int(Z80_I, data[0x40]); m_maincpu->set_state_int(Z80_R, (data[0x44] & 0x7f) | (data[0x48] & 0x80)); memcpy (m_ram->pointer(), data + 0x084c, (m_ram->size() < 0x1800) ? m_ram->size() : 0x1800); break; case GALAXY_SNAPSHOT_V2_SIZE: m_maincpu->set_state_int(Z80_AF, data[0x00] | data[0x01] << 8); m_maincpu->set_state_int(Z80_BC, data[0x02] | data[0x03] << 8); m_maincpu->set_state_int(Z80_DE, data[0x04] | data[0x05] << 8); m_maincpu->set_state_int(Z80_HL, data[0x06] | data[0x07] << 8); m_maincpu->set_state_int(Z80_IX, data[0x08] | data[0x09] << 8); m_maincpu->set_state_int(Z80_IY, data[0x0a] | data[0x0b] << 8); m_maincpu->set_state_int(Z80_PC, data[0x0c] | data[0x0d] << 8); m_maincpu->set_state_int(Z80_SP, data[0x0e] | data[0x0f] << 8); m_maincpu->set_state_int(Z80_AF2, data[0x10] | data[0x11] << 8); m_maincpu->set_state_int(Z80_BC2, data[0x12] | data[0x13] << 8); m_maincpu->set_state_int(Z80_DE2, data[0x14] | data[0x15] << 8); m_maincpu->set_state_int(Z80_HL2, data[0x16] | data[0x17] << 8); m_maincpu->set_state_int(Z80_IFF1, data[0x18] & 0x01); m_maincpu->set_state_int(Z80_IFF2, (uint64_t)0); m_maincpu->set_state_int(Z80_HALT, (uint64_t)0); m_maincpu->set_state_int(Z80_IM, (data[0x18] >> 1) & 0x03); m_maincpu->set_state_int(Z80_I, data[0x19]); m_maincpu->set_state_int(Z80_R, data[0x1a]); memcpy (m_ram->pointer(), data + 0x0834, (m_ram->size() < 0x1800) ? m_ram->size() : 0x1800); break; } m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE); m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE); } SNAPSHOT_LOAD_MEMBER(galaxy_state::snapshot_cb) { uint8_t* snapshot_data; switch (snapshot_size) { case GALAXY_SNAPSHOT_V1_SIZE: case GALAXY_SNAPSHOT_V2_SIZE: snapshot_data = auto_alloc_array(machine(), uint8_t, snapshot_size); break; default: return image_init_result::FAIL; } image.fread( snapshot_data, snapshot_size); setup_snapshot(snapshot_data, snapshot_size); return image_init_result::PASS; } /*************************************************************************** Driver Initialization ***************************************************************************/ void galaxy_state::init_galaxy() { address_space &space = m_maincpu->space(AS_PROGRAM); space.install_readwrite_bank( 0x2800, 0x2800 + m_ram->size() - 1, "bank1"); membank("bank1")->set_base(m_ram->pointer()); if (m_ram->size() < (6 + 48) * 1024) space.nop_readwrite( 0x2800 + m_ram->size(), 0xffff); } void galaxy_state::init_galaxyp() { uint8_t *ROM = memregion("maincpu")->base(); ROM[0x0037] = 0x29; ROM[0x03f9] = 0xcd; ROM[0x03fa] = 0x00; ROM[0x03fb] = 0xe0; } /*************************************************************************** Machine Initialization ***************************************************************************/ void galaxy_state::machine_reset() { m_interrupts_enabled = true; }