diff options
Diffstat (limited to 'src/devices/bus/electron/cart/ap5.cpp')
-rw-r--r-- | src/devices/bus/electron/cart/ap5.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/devices/bus/electron/cart/ap5.cpp b/src/devices/bus/electron/cart/ap5.cpp new file mode 100644 index 00000000000..660587c7642 --- /dev/null +++ b/src/devices/bus/electron/cart/ap5.cpp @@ -0,0 +1,171 @@ +// license:BSD-3-Clause +// copyright-holders:Nigel Barnes +/********************************************************************** + + ACP Advanced Plus 5 + +**********************************************************************/ + + +#include "emu.h" +#include "ap5.h" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +DEFINE_DEVICE_TYPE(ELECTRON_AP5, electron_ap5_device, "electron_ap5", "P.R.E.S. Advanced Plus 5") + + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void electron_ap5_device::device_add_mconfig(machine_config &config) +{ + /* rom sockets */ + GENERIC_SOCKET(config, m_romslot[0], generic_plain_slot, "electron_rom", "bin,rom"); // ROM SLOT 14 + m_romslot[0]->set_device_load(device_image_load_delegate(&electron_ap5_device::device_image_load_rom1_load, this)); + GENERIC_SOCKET(config, m_romslot[1], generic_plain_slot, "electron_rom", "bin,rom"); // ROM SLOT 15 + m_romslot[1]->set_device_load(device_image_load_delegate(&electron_ap5_device::device_image_load_rom2_load, this)); + + /* via */ + VIA6522(config, m_via, DERIVED_CLOCK(1, 16)); + m_via->readpb_handler().set(m_userport, FUNC(bbc_userport_slot_device::pb_r)); + m_via->writepb_handler().set(m_userport, FUNC(bbc_userport_slot_device::pb_w)); + m_via->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w)); + + /* user port */ + BBC_USERPORT_SLOT(config, m_userport, bbc_userport_devices, nullptr); + m_userport->cb1_handler().set(m_via, FUNC(via6522_device::write_cb1)); + m_userport->cb2_handler().set(m_via, FUNC(via6522_device::write_cb2)); + + /* 1mhz bus port */ + BBC_1MHZBUS_SLOT(config, m_1mhzbus, DERIVED_CLOCK(1, 16), bbc_1mhzbus_devices, nullptr); + m_1mhzbus->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w)); + m_1mhzbus->nmi_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::nmi_w)); + + /* tube port */ + BBC_TUBE_SLOT(config, m_tube, electron_tube_devices, nullptr); + m_tube->irq_handler().set(DEVICE_SELF_OWNER, FUNC(electron_cartslot_device::irq_w)); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// electron_ap5_device - constructor +//------------------------------------------------- + +electron_ap5_device::electron_ap5_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, ELECTRON_AP5, tag, owner, clock) + , device_electron_cart_interface(mconfig, *this) + , m_via(*this, "via6522") + , m_tube(*this, "tube") + , m_1mhzbus(*this, "1mhzbus") + , m_userport(*this, "userport") + , m_romslot(*this, "rom%u", 1) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void electron_ap5_device::device_start() +{ +} + +//------------------------------------------------- +// read - cartridge data read +//------------------------------------------------- + +uint8_t electron_ap5_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2) +{ + uint8_t data = 0xff; + + if (infc) + { + data = m_1mhzbus->fred_r(offset); + + switch (offset & 0xf0) + { + case 0xb0: + data &= m_via->read(offset & 0x0f); + break; + + case 0xe0: + data &= m_tube->host_r(offset & 0x0f); + break; + } + } + else if (infd) + { + data = m_1mhzbus->jim_r(offset); + } + else if (oe) + { + data = m_romslot[romqa]->read_rom(offset & 0x3fff); + } + else if (oe2) + { + data = m_rom[offset & 0x1fff]; + } + + return data; +} + +//------------------------------------------------- +// write - cartridge data write +//------------------------------------------------- + +void electron_ap5_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2) +{ + if (infc) + { + m_1mhzbus->fred_w(offset, data); + + switch (offset & 0xf0) + { + case 0xb0: + m_via->write(offset & 0x0f, data); + break; + + case 0xe0: + m_tube->host_w(offset & 0x0f, data); + break; + } + } + else if (infd) + { + m_1mhzbus->jim_w(offset, data); + } +} + + +//************************************************************************** +// IMPLEMENTATION +//************************************************************************** + +image_init_result electron_ap5_device::load_rom(device_image_interface &image, generic_slot_device *slot) +{ + uint32_t size = slot->common_get_size("rom"); + + // socket accepts 8K and 16K ROM only + if (size != 0x2000 && size != 0x4000) + { + image.seterror(IMAGE_ERROR_UNSPECIFIED, "Invalid size: Only 8K/16K is supported"); + return image_init_result::FAIL; + } + + slot->rom_alloc(0x4000, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE); + slot->common_load_rom(slot->get_rom_base(), size, "rom"); + + // mirror 8K ROMs + uint8_t *crt = slot->get_rom_base(); + if (size <= 0x2000) memcpy(crt + 0x2000, crt, 0x2000); + + return image_init_result::PASS; +} |